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,//^ bi- 



PYXIPOMA, Morch, 186 



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



Narrow, smoothish, pellucid, white, obsoletely brown-tinted, 

 rarely striated, apical whorls slightly pyramidal, fissure articu- 

 lated, partly closed by an internal lamina near the apex. 



Australia, China, East Indies. 



Gregarious, forming conglomerated masses. 



T. TAHEITENSIS, Morch. PI. 58, fig. 2T. 



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

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



Tahiti. 



Shell much larger than the preceding, with stronger lirse, the 

 interstices cancellated, slit coarctate. The only figure of the 

 species is from a fragment in the British Museum. 



S. WELDII, Tenison-Woods. PL 58, fig. 28. 



Graceful, smooth or very lightly longitudinally striated, 

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

 slit filled below, afterwards it is open. 



_ So. Australia, Tasmania. 



Undetermined or Unjigured Species of Siliquaria. 



S. Cos, Cantraine. Mediterranean Sea. 



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



S. MOBII, Morch. Manilla. 



S. .GIGAS, Lesson. Moluccas. 



S. PAPILLOSA, Rees. Hab. unknown. 



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



S. ANGUILL^E, Morch. West Indies. 



S. MODESTA, Dall. West Indies. 



Genus CRYPTOBIA, Desh., 18G3. 



The two species, MICIIELTNI and HETEROPSAMMARIUM, are not 

 described or figured. Isl. Reunion. 



