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



the naked eye, as the portion of the surface behind the line is far less glossy than the 

 remaiuder. The dentition of all is the same, consisting of two cardinal teeth in each 

 valve, all bifid, with the exception of the posterior in the left, which is smaller than the 

 others and oblique. In addition to these, there is in each valve a more or less distinct 

 lateral tooth rather remote from the cardinals. The type of this species is in the British 

 Museum, with the locality " Eed Sea " attached to it, but I am unable to discover upon 

 what authority it is so labelled. No mention is made of Psammohia pallida by Reeve, 

 whose monograph, with two exceptions, is based upon the specimens contained in Mr. 

 Cuming's collection. The fact of this shell having lateral teeth should remove it from 

 this genus. However, the " tout ensemble " is so Psammobia-like (and I find other 

 forms intermediate with respect to this character) that I tliink it may properly l)e ullowed 

 to remain with this group. 



Psammohia intermedia, Deshayes. 



Psammohia wtermedia, Deshayes, Proc. Zool. Soc. Lond., 1854, p. 319. 



Psammohia intermedia, Eeeve, Couch. Icou., veil. x. fig. 25. 



Gari intennedia, Tryon, Cat. TellinidiB in Amer. .Journ. Conch., vol. iv., Apjieiidi-x, ji. 74. 



Habitat. — St. Vincent, Cape de Verde Islands, in 7 to 20 fathoms (Challenger) ; 

 coast of Portugal (Deshayes). 



The Challenger specimens of this species are only about half the length of the shell 

 figured by Reeve, and more brightly variegated witli a rosy purple tint, the interior 

 exhibiting the markings more vividlv than the exterior. 



Psammohia zonalis (Lamarck). 



Psammotcea zonalis, Lamarck, Anim. Sans Vert., ed. 2, vol. vi. p. 182. 



Psammotcea zonalis, Delessert, Eecueil, pi. v. fig. 9, a-c 



Psammotcea zonalis, Hanley, Cat. Eec. Biv. Shells, p. 60, and Appendix, p. .346, pi. xi. fi<;. 50. 



Psammohia zonalis, Reeve, Conch. Icon., vol. x. fig. 29. 



Psammohia tellinmformis (Deshayes) Reeve, loc. cit., fig. 31. 



Psammohia puella, Deshayes, Proc. Zool. Soc. Lond., 1854, p. 320. 



Psammohia puella, Reeve, Conch. Icon., fig. 2. 



Psuinmohia striata, Deshayes, Proc. Zool. Soc. Lond., 1854, p. 321. 



Psammohia compta, Deshayes, Proc. Zool. Soc. Lond., 1854, p. 321. 



Psammohia compta,, Reeve, loc. cit., fig. 24. 



Psammohia radiata, Dunker, in Philippics Abbildungen, vol. i. p. 194, pi. ii. fig. 5. 



Habitat. — Port Jackson, Sydney, in 4 to 18 fathoms. 



This species has also been found at Amboina, Java, Philippine Islands, and '^asmauia. 

 It varies somewhat in painting, some forms being more rayed than others. In all, how- 

 ever, the apices of the umbones are pale, and the interior of the valves more or less lilac. 



