38 THE VOYAGE OF a M.S. CHALLENGER. 



4. Puncturella, Lowe, 1827. 

 Species. 



1. Puncture/la clathrata, Jeffr. 6. Puncturella oxia, Wats. 



2. Puncturella agger, Wats. 7. Puncturella sportella, Wats. 



3. Puncturella brychia, Wats. 8. Puncturella (Cranopsis) asturiana (Fischer). 



4. Puncturella n. sp. 9. Puncturella (Cranopsis) granulata (Seg.) 



5. Puncturella noachina (Linne). 10. Puncturella (Cranopsis) profundi, J effr. 



11. Puncturella (Fissuriscpta) rostrata, Seg. 



The known species of this genus are few. Adams in the " Genera " (vol. i. p. 451) enumerates 

 only seven ; and of these, Puncturella -princeps, Mighels, and Puncturella galeata, Gould, are certainly 

 the same as Puncturella noachina, Linne ; while others probably need revision. Dr Gwyn Jeffreys, 

 in his " Valorous " Report (Ann. and Mag. Nat. Hist., 1877, Ser. 4, vol. xix. p. 232), describes one 

 new species, and refers to three others from the " Porcupine " dredgings, of which he has since 

 described one in his "Lightning" and "Porcupine" Moll. (Proc. Zool. Soc. Lond., 1882, p. 675). 

 The other two are Sicilian Pliocene fossils described by Seguenza. Mr W. H. Dall, in his " Report 

 on the 'Blake' Dredgings" (Bull. Mus. Comp. Zool., August 25, 1881, pp. 75, 76), has described 

 two new and very interesting species from the Gulf of Mexico. One species from the Bay of 

 Biscay, Puncturella asturiana (Simula), has been published by Dr Fischer. All these are referred 

 to below. 



Looking at these facts, one is struck by the very large number of species (no fewer than eight) 

 from one locality. Further, if we take in connection with this the poverty of specimens from that 

 locality, and also the rarity of the genus in the dredgings in general, we can hardly doubt that the 

 true home of Puncturella has not yet been found. 



My own observations entirely confirm the remarks of Mr W. H. Dall (" Blake " Dredgings, 

 Bull. Mus. Comp. Zool., vol. ix. p. 76), that the presence or absence of buttresses to the septum 

 is a feature that cannot be taken as a basis of distinction, since it is not constant in the same 

 species. 



In descriptions of species under this genus a good deal of confusion would be avoided if it were 

 remembered that the fissure lies in front of, not behind, the apex. The whole of Gould's descriptions 

 of Rimula (U. S. Expl. Exped., Moll., pp. 368-372, figs. 475-478) apply to this genus — a fact one 

 would hardly recognise from his figures of the animals, in which the tentacles are represented as 

 being of extreme length and fineness. 



As some confusion exists regarding the genera of the group Puncturellidas, I subjoin a notice 

 of them. 1 



Puncturella, ( Fissure a long cleft at the top, apex persistent, sculpture reticulate, internal septum 



Lowe. \ arched. 



Cranopsis, ( Fissure a long cleft between the top and the front edge, apex persistent, sculpture 



A. Adams. ( reticulate, internal septum arched 



1 For a comparison of Rimula Cranopsis and Puncturella (Cemoria), see Journ. de Conch., Paris, vol. xiv., 

 1866, p. 169. 



