SHAW: ON CTPByEA AND TEIVIA. 311 



has been compared with the above, is quite a different shell, being 

 attenuated anteriorly, with finer and closer costse, a different style of 

 coloration, and occurs only in South Africa. 



Trivia oniscus, Lam.^ 



This species must retain the name aperta given to it by Swainson,- 

 since Bolten had already used the term oniscus (Mus. Bolt., p. 24) for 

 a species which is the same as Trivia pediculus, Linn. The Bligh Sale 

 Catalogue was published a year before the appearance of Mawe's 

 " Linngean System of Conchology," where that author described the 

 same shell and under the same name as that used by Swainson. 



Trivia pulex, Qvaj.'^ 

 Lathyrus (Dufresne MSS.), Blainville,^ was the first name given to 

 this species of Trivia. It was published two years prior to pulex, 

 and is quoted by Gray in his synonymy of that species. Blainville's 

 reference to the Isle of France is erroneous, as it is a Mediterranean 

 species extending to the Azores and along the north-west coast of 

 Africa. In his " Faune frauQaise," 1830, p. 248, Blainville again 

 refers to this species, giving a fuller description, accompanied by two 

 good figures (pi. 9a, figs. 3, 3«), and citing the original description 

 of 1826. There can be no doubt that T. lathyrus is the same species 

 as T. pulex, Gray, and as it has priority that name must be adopted. 

 The Trivia lathyrus, Kiener,-' is not Blainville's species, but only 

 a synonym of T. sanc/uinea, Sowerby." 



Trivia sulcata, Gaskoin.'' 



Dillwyn had already used the name sulcata to designate a species of 

 Trivia which included T pediculus, Linn, (part), T. ory%a, Lam., and 

 T. lathyrus, Blainville {T. pulex, Gray). Dillwjm's species on this 

 account could not stand, neither can Gaskoin's, as he employed tlie 

 same preoccupied name. Roberts, however (Amer. Journ. Conch., 

 vol. V, p. 206), proposed the name T. Qaslcoinii for the T. sulcata of 

 Gaskoin. 



DESCRIPTION OF FOUR NEW VARIETIES. 



1. Cypr^a helvola, Linn., var. calt.ista. 



Shell of an oval form, sides hardly thickened ; teeth on the columella 

 the same as in the typical form, while on the anterior end of the outer 

 lip the last six are produced over the base and margin, and disappear 

 between the pitting of the latter ; the last four on the posterior end of 

 the outer lip being likewise produced, but not so strongly accentuated 

 as the former. The base and teeth are of a palish golden brown, 



' Ann. du Mus., 1810, vol. xvi, p. 103. 



2 Bligh Sale Cat., 1822, p. 21, No. 317; appendix, p. 18. 



3 Zool. Journ., 1828, vol. iii, p. 368. 



* Diet, des Sciences Nat., 1826, vol. xliii, p. 25. 



* Coq. Viv., p. 146, pi. xxii, fig. 4. 



« Conch. Illust., p. 12, No. 115, fig. 32. 

 ' Proc. Zool. Soc, 1848, p. 95. 



