342 SMITH : NOMENCLATURE OF CERTAIN GENkRA. 



distinct from the true African Achafi/nv, and was iirst of all 

 generically separated by Blainville in 1817, who adopted a 

 manuscript name proposed by Ferussac. This is printed 

 ' Ceclionides ' in the ' Dictionnaire des Sciences Naturalles,' 

 vol. v., Suppl. p. 129. In the seventh volume of the same 

 work (p. 332) this generic term is rendered in French ^ Cecilioide.' 

 There can, I think, be little doubt that both these names are 

 typographical errors, and that Ferussac intended to refer to this 

 little creature's blindness, of which he was fully cognisant.^ 



Hermannsen in 1846 emended the spelling to decilioide^, 

 and Bourguignat in 1856, who objected to this term on account 

 of its being an adjective, proposed as a substitute, CcBcilianella. 



In connection with the term Vivipcxrus I have already stated 

 my reasons for retaining such adjective names as these, which 

 have been used in times past, and therefore in this instance 

 also I propose to adhere to the name Cacilioides. 



With regard to the other two species, namely. Helix lubrica 

 and Turbo trldeiis, I am inclined to place them in distinct 

 genera, the former in Cochlicopa (Risso ex Ferussac) and the 

 latter in Azeca (Leach) Fleming. 



The difference in the apertures of these two shells is very 

 considerable. In Azeca tridens the outer lip is peculiarly sinu- 

 ated at the upper part, and the thickening of the inner lip is 

 remarkable, in addition to which the armature within forms 

 another distinction. 



Risso's genera Feiussacia and Cochlicopa are very closely 

 related, and, by several authors have been united. The foot of 

 the animal of Fcnissacia, however, is said to have a mucous 

 pore, which is wanting in Cochlicopa. 



ABRIDGED SYNONYMY OF CceciHoideS FERUSSAC. 



18 1 7 Ceclionides (Ferussac MSS.) Blainville, Diet. Sci. Nat. 



vol. V. Suppl, p. 129. 

 1817 Cecilioide (Ferussac) Blainville, I.e. vol. vii. p. 332. 



I Vide his Essai d'line Methode Conchyl. p. 77. 



J.C, vi., Apr., t8.>i. 



