M. CAPITELLUM. _M._ ecaudatus ovatus, columella rugosa, labio edentulo, superficie inermi rugosa. "Alba" followed "edentula", and "Umbilicus ad basin" terminated the description in the original: the word "striis" was a subsequent introduction. M. TURBINELLUS. _M._ ecaudatus, turbinatus, columella dentata, spinis explicatis. The printed additions are "anteriores", "nodulosa", "alba", "Cauda vix ulla", and "Variat colore albo spira longiore". M. CERAMICUS. _M._ ecaudatus, utrinque acuminatus, columella dentata, spinis conicis. "Rumph. t. 49. f. L." was an unpublished synonym. M. NODUS. _M._ ecaudatus ovatus, labio denticulato. As "Gualt. t. 28. f. R." was quoted, and "aut nigris, conicis, obtusiusculis" (a character which probably belonged to some distinct species erroneously supposed to be a variety) was not inserted in the manuscript, I feel convinced that the _Purpura hystrix_ of authors was the species designed in the 'Museum Ulricæ.' M. HYSTRIX. _M._ ecaudatus edentulus, fauce lævi. M. MANCINELLA. _M._ ecaudatus, edentulus fauce striata. This original heading, and the absence of the erroneous synonym from the MS., confirm the received opinion of the identity of the Museum species (not that of the 'Systema') with _Purpura mancinella_. M. HIPPOCASTANUM. _M._ ecaudatus edentulus, fauce edentula integra, spinis serie triplici. Gualtieri's erroneously cited figure was not indicated in the manuscript. No specific name had been originally attached to the description. M. MELONGENA. _M._ ecaudatus edentulus fauce patula lævi, spinis serie duplici. "Bonan. 3. f. 186" had been added to the synonymy by our author. The details were less copious than in the published edition, "apice solo acuminatus" being the meagre substitute for the entire description from "Spira" to the end. M. FICUS. _Bul._ caudata, striis reticulatis, spira obtusa. "Pet. Amb. t. 6. f. 9" was an omitted synonym. The shell described in the 'Museum' was assuredly not the _ficus_ of most writers. M. RAPA. _Bul._ caudata, striis longitudinalibus, spira acuta. M. FUSUS. _Turric._ caudata lævis, labio dentato. "Bonan. f. 121" and the name had been added to the MS. by Linnæus. M. BABYLONIUS. _Turric._ caudata, transversim angulo sulcata, labio marginali versus basim sinu exciso. M. COLUS. _Turric._ caudata striata, labio exteriore crenato. The printed emendations were "longa" and "s. angulati." The name was added by Linnæus. The following unnamed _Turricula_ succeeded the species in the manuscript copy:-- _T._ caudata striata, longitudinaliter sulcata. Testa parva, striis plurimis secundum anfractus. Anfractus scabri, sulcis longitudinalibus 15. Color anfractuum superne griseus inferne pallidus. Apertura ovata. Rostrum baseos rectum, testæ dimidio brevius. Labium tantum exterius integrum. An filia præcedentis? M. MORIO. _Strom._ spira subnodosa, labio exteriore intus rugoso.