214 THE VOYAGE OF H.M.S. CHALLENGER. 



4. Cominella, Gray, 1857. 



Species. 

 1. Cominella porcata (Gmelin). 2. Cominella (Adamsia) typica, Dunker. 



1. Cominella porcata (Gmelin). 



Chemnitz, Conch. Cab., voL iv. p. 71, pi. cxxvi. figs. 1213, 1214. 

 Buccinum porcatuvi, Gmelin, p. 3494, No. 105. 



„ mexicanum, Bruguiere, Encycl method., vol. i. p. 260, sp. 23. 



,, porcatum, Dillwyn, Catalogue, vol ii. p. 635, sp. 113. 

 Purpura ligata, Lamarck, Anim. s. vert., voL vii. p. 244, and (ed. Desh.) vol. x. p. 78, sp. 28. 

 Buccinum porcatum, Lamarck, Anim. s. vert. (ed. Desk), vol. x. p. 190, sp. 66. 



,, ligatum, Kiener, Iconog., p. 7, sp. 7, pi. v. fig. 15. 



,, ,, Eeeve, Conch. Icon., vol. iii. pi. iv. fig. 22. 



„ ,, Krauss, Siidafrik. Moll., p. 119, sp. 1. 



Cominella porcata, Kiister, Conch. Cab. (ed. Kiister), p. 5, sp. 4, pL i. figs. 8, 9, pi. ii. fig. 3. 



„ „ v. Martens, Siidafrik. Moll., Jahrb. deutsch. Malak. Gesellsch., 1874, p. 136. 



„ ,, Kobelt, Jahrb. deutsch. malak. Gesellsch. 1878, p. 231, sp. 1. 



Tryon, Manual, vol. iii. p. 202, pi. lxxx. figs. 392, 396, 399, 404. 



October 29-December 16, 1873. Simon's Bay, Cape. 10 to 20 fathoms. 

 Habitat. — Cape of Good Hope (British Museum, &c.) 



2. Cominella {Adamsia) typica, Dunker. 



Cominella typica, Dunker, Proc. ZooL Soc. Lond., 1856, p. 357. 



Adamsia typica, Angas, Port Jackson Moll, Proc. Zool. Soc. Lond., 1867, p. 192. 



,, ,, Kobelt, Jahrb. deutsch. malak. Gesellsch., 1878, p. 236, sp. 1. 



Urosalpinx tritoniformis, Tryon, Manual, vol. ii. p. 156, pi. xxxix. figs. 488, 491, 496. 



April 17-18, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 

 April 23, 1874. Port Jackson, Sydney. 6 to 15 fathoms. 



Habitat. — Philippines (Dunker), South Australia (Angas). 



Mr Angas says that the " genus " Adamsia has the operculum of a Purpura, and must therefore be 

 removed from the Nassincc. It would evidently be well to know something more of the relation of the 

 operculum to the life history of a mollusk before adopting it so lightly as has been done for a basis of 

 classification, but in this instance the peculiarity of the operculum comes in satisfactorily to confirm 

 Dunker's original opinion. In the Proc. Zool. Soc. Lond., 1856, p. 357, he had said of this species: 

 " Ad Comincllas maxime accedit, a quibus vero apertura? indole valde differt, cum costa valida in labii 

 superiore parte insidente, qua Comincllcc insignes sunt, haec cochlea plane careat. Preterea sculptura 

 et totus testa? habitus tarn singularis est, ut earn pro novi generis typo habendam esse putaverim." 

 Following up this thought of Dunker's, Tenison Woods has proposed Agncwia as a new genus for its 

 reception, and Adamsia adelaidm, Ad. and Ang., and Purpura ncglecta, Ad., have been added to the 

 group. Tryon suppresses Agncwia altogether, and classes Cominella typica, Dunk., under Urosalpinx, 

 holding Purpura (i.e., Urosalpinx) tritoniformis, Blainville, to be identical with, and Adamsia ade- 

 laidw, Ad. and Ang, and Purpura ncglecta, Ang., to be trifling varieties of Dunker's species. 



