302 PKOCEEDINfiS OF TIIK J! ALACOLOGICAL SOCIETY. 



Ill tlie Proc. Zool. Soc. (Lond.), 1847, p. 129 et scq., a paper waft 

 publislu'd entitltul "A List of the Genera of Keceiit Mollusca, their 

 S5'nonynia aiKlTy])es by J. E. Gray ". In the introduction is written : 

 " I liave been induced to send it in its ))resent state, as I am con- 

 stantlj' requested by both Ensjlish and continental conchnlogists to 

 supply them with copies of the Synopsis of the Britisli Museum for 

 1838, 1840, 1842, and 1844, which contains a list of the genera of 

 Mollusca, and which is now out of print, and also often to give them 

 information witli regard to the authorities for the several genera 

 contained in tliat list, which shows that then; is an evident want of 

 some recent information on this subject. . . . Tlie arrangement 

 followed is that which was proposed in the Synopsis of the Contents 

 of the British Museum for 18:38, and which has been gradually 

 modified in the different editions as I have become better accjuainted 

 with tlie animals of the different genera." 



It is this list which biought into prominence the "Synopsis" 

 names, these being there quoted as "Gray Svn. 1840", " Syn. B.M.", 

 "S.B.M.". or simply "Gray 1840". " I 'have therefore" carefully 

 gone through that list, and taken out all tlie names Gray there credited 

 to liimself as introduced in the Synopsis. As usual in all of (J ray's 

 work discrepancies are at once evident, names being given which do 

 not appear in the Synopsis, and some I have noticed as new in the 

 Synopsis are not included in the 1847 list. Further, Gray constantly 

 quotes 1844, and generally after this a number. This shows great 

 carelessness, sinc(! all these 1844 references, and there are many, 

 should be 1842, where the number given agrees with the page on which 

 the genus is diagnosed. It has been suggested that an alphabetical list 

 would prove serviceable, and therefore I tabulate the names on that 

 method and give after each its definition which appeared in 1840 or 

 1842. or the disposal of it in 1847, according to the Proc. Zool. Soc. 

 article. 



AcMithoehf'tes, 1840. 1847. Acanthochitex, Eisso. 



Agar id, 1840. In 1847 type is given as Chama Agar. 



Alcadia, 1840, p. 1,30. 1840a, p. 134. ''The ITelichue have a simple 



month. Alcadia differs in having a slit in front of the mouth, 



into which is fitted the tooth-like process of the operculum." 

 Amaihina, 1842. 1842, p. 63. "The Amnthina differ from Capulus 



in having three or more strong longitudinal ridges in front." 

 Amicida, 1840, p. 123. 1840a, p. 127. '' Acanthochetei^ is peculiar 



for having a bundle of bristles placed on each side of the valves; 



and Chitonellus and Amicula only differ in having the valves 



nearly hidden in the mantle of the animals." 

 Amnicola, 1840. 1847. ^OT««ro/rt sp., Anthony. 

 Anapa, 1840. In 1847 quoted as Anapa, Gray, 1844, and type 



given as Ergcina petitiana. 

 Argina, 1840. 1842, ]). 81. "... and -^^r^/Vm are ovate, subcordate, 



convex shells with a crenated margin, and the front grouj) of 



teeth small and roundish : the hinge teeth are all equally 



transverse." 



