CRYPTOBIA. 191 



shell, for similar specimens are before me, besides intermediates. 

 These sections of Siliquaria, I repeat, are founded on evanescent 

 characters, and should be accepted with reserve. 



Section Pyxipoma, Morch, 1860. 



S. LACTEA, Lam. PI. 58, fig. 20. 



Narrow, smoothish, pellucid, white, obsoletel}' brown-tinted, 

 rarely striated, apical whorls slightly pyramidal, fissure articu- 

 lated, parti}' closed by an internal lamina near the apex. 



Australia, China, East Indies. 



Gregarious, forming conglomerated masses. 



T. Taheitensis, Mcirch. PI. 58, fig. 27. 



Rather thick, smooth, fulvous, longitudinally^ lirulate, cancel- 

 lated between the ridges, slit narrow, right margin thichkened. 



TaJiiti. 



Shell much laiger than the preceding, with stronger lir^e, the 

 interstices cancellated, slit coarctate. The onl}- figure of the 

 species is from.a fragment in the British Museum. 



S. Weldii, Tenison-Woods. PI. 58, fig. 28. 

 . Graceful, smooth or very lightly longitudinall}' striated, 

 whitish, yellowish, or very light rosy, first three whorls with the 

 slit filled below, afterwards it is open. 



So. Australia, Tasmania. 



Undetermined or Un figured Species of Siliquaria. 



S. CosT^, Cantraine. Mediterranean Sea. 



S. glabra, Risso (= the above ?). Mediterranean. 



S. MoBii, Mcirch. Manilla. 



S. GiGAS, Lesson. Moluccas. 



S. PAPiLLOSA, Rees. Hab. unknown. 



S. SPIRALIS, Risso (? = aS. obtusa, Schum.). Mediterranean. 



S. ANGUiLLiE, Mdrch. West Indies. 



S. MODESTA, Dall. , West Indies. 



Genus CRYPTOBIA, Desh., 1863. 



The two species, Michelini and heteropsammarium, are not 

 described or figured. Isl. Reunion. 



