<?xml version="1.0" encoding="UTF-8"?>
<!--(C) EIOPA - XBRL Taxonomy-->
<?officialURI http://eiopa.europa.eu/eu/xbrl/s2c/dict/dom/di/mem.xsd?>
<?taxonomy-version 2.6.0?>
<?taxonomy-date 2021-07-15?>
<xs:schema xmlns:s2c_DI="http://eiopa.europa.eu/xbrl/s2c/dict/dom/DI" targetNamespace="http://eiopa.europa.eu/xbrl/s2c/dict/dom/DI" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:model="http://www.eurofiling.info/xbrl/ext/model" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xsi:schemaLocation="http://www.xbrl.org/2003/instance http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd http://www.eurofiling.info/xbrl/ext/model http://www.eurofiling.info/eu/fr/xbrl/ext/model.xsd http://www.xbrl.org/dtr/type/non-numeric http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd">
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xs:import namespace="http://www.eurofiling.info/xbrl/ext/model" schemaLocation="http://www.eurofiling.info/eu/fr/xbrl/ext/model.xsd" />
  <xs:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xlink:href="mem-lab-en.xml" xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" />
      <link:linkbaseRef xlink:href="mem-def.xml" xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" />
    </xs:appinfo>
  </xs:annotation>
  <xs:element name="x0" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:isDefaultMember="true" model:creationDate="2014-07-07" id="s2c_x0" />
  <xs:element name="x1" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2014-07-07" id="s2c_x1" />
  <xs:element name="x2" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2014-07-07" id="s2c_x2" />
  <xs:element name="x4" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2014-07-07" id="s2c_x4" />
  <xs:element name="x5" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2014-07-07" id="s2c_x5" />
  <xs:element name="x6" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2014-07-07" id="s2c_x6" />
  <xs:element name="x7" substitutionGroup="xbrli:item" abstract="true" type="nonnum:domainItemType" xbrli:periodType="instant" model:creationDate="2015-09-30" id="s2c_x7" />
</xs:schema>