PSAMMOBIA.— Plate II. 



solid, nearly equilateral, whitish, many-rayed with 

 pale violet, sides gently slanting at the upper part, 

 then rounded, posterior side the shorter, scarcely 

 truncated. 

 Gray, Dieffenbach's Travels in New Zealand ; Fauna, 



p. 253. 

 Hab. New Zealand ; Strange. 



A rather solid shell, with the sides gently sloping from 

 the umboes, and nearly equally rounded. The painting 

 appears in faint violet rays througliout upon a dull stone- 

 white ground. 



Species 13. (Mus. Cuming.) 



PsAMMOBiA TRiSTis. Psam. tedd ovato-transversa, de- 

 jiressiusculd, soliduld, subaquilaterali, tramvertim in- 

 aqualiler mdstriatd, albo-grised, obscure violaceo ra- 

 diatd, intus pallide violaced, latere antico paulo lon- 

 giore, lateribm superne declivibus, antico late obtuso, 

 postico late obtuse trmicaio, subaiifftilato. 



The sad Psammobia. Shell ovately transverse, rather 

 depressed, rather solid, nearly equilateral, transversely 

 unequally finely striated, whitish-gi-ey, obscurely 

 violet-rayed, pale violet within, anterior side a little 

 the longer, sides slanting at the upper part, anterior 

 broadly obtuse, posterior broadly obtusely truncated, 

 slightly angled. 



Deshayes, Pro. Zool. Soc. 185-t, p. 318. 



Eai. Amboyna. 



Painted with very obscure violet rays, with a thin deci- 

 duous epidermis more or less remaining along the margin 

 of the shell. 



Species 14. (Mus. Cuming.) 



Psammobia togata. Psam. testa ovato-transversd, iu- 

 miduld, inaquilaterali, extremitatibus sensint attetiuatd, 

 attamen antice rotundatd et breviore, postice oblique 

 truncatd, epidermide fusco-virente, margines siiperante, 

 vestitd, ad umiones decidud vel erosd, valvis intus ex- 

 tusgwe albis. 



The clothed Psammobia. Shell ovately transverse, 

 rather swollen, inequilateral, gradually attenuated at 

 the extremities, but rounded and shorter anteriorly, 

 and obliquely truncated posteriorly, cloilied with a 

 brownish-green epidermis passing over tlie margins, 

 deciduous or erode<l at the umboes, valves within 

 and without white. 



Deshayes, Pro. Zool. Soc. 1854, p. 318. 



Ilab. Port Essington, Australia ; Jukes. Bay of Manilla, 

 Philippines; Cuming. 

 Of quite a different typical character from any of the 



preceding species, the shell being of a rough opake texture, 



attenuated towards the extremities, covered with a thick 



fibrous epidermis. 



