PSAMMOBIA.— Plate III. 



strii3 ad latus posticum sulobliquis, elevatis ; Uvido- 

 purpurascente, purptireo-roseo pallide radiaid, latere 

 antico rotundato, posiico oblique angulato et trmicaio. 



The amethyst Psammobia. Shell elongately transverse, 

 compressed, nearly equilateral, densely finely striated, 

 striae on the posterior side rather oblique and raised ; 

 livid-purple, faintly rayed with pnrple rose, interior 

 side rounded, posterior obliquely angled and trun- 

 cated. 



Ha/j. Ceylon ; E. L. Layard. 

 Of a delicate livid-purple colour, rayed at rather distant 



intervals with faint purple-rose. 



Species 20. (Mus. Cuming.) 



Psammobia tripartita. Paam. testa elongato-transverad, 

 elUpsoided, compressd, aquilaterali, tnaculis minimis 

 albis canjlueidibus irregulariter sparsis notatd sen ob- 

 scure albo radiatd, tratisversim striata, striis antice 

 latis et planis, in medio Upartitis et duplo numerosi- 

 oribics, in latere subito lamellosis, imbricatis, acutis, 

 latere antico semi-elliptico, obtuse, latere postico paulo 

 latiore, obliqui truncato, angulo acutiuseulo in/erne 

 terminato, angulo obtuso obsoleto ab umhone decur- 

 rente. 



The tripartite Psammobia. Shell elongately trans- 

 verse, ellipsoid, compressed, equilateral, violet, marked 

 with irregularly sprinkled confluent minute white 

 spots or obscurely white-rayed, transversely striated, 

 striae anteriorly broad and flat, bipartite and twice 

 as numerous in the middle, on the posterior side 



suddenly lamellose, imbricated, and sharp, anterior 

 side semi-elliptic, obtuse, posterior side rather broader, 

 obliquely truncated, terminated at the lower part by 

 a rather sharp angle, an obsolete obtuse angle run- 

 ning from the umbo. 



Deshayes, Pro. Zool. Soc. 1854, p. 3!)1. 



Hab. San Nicolas, Island of Zebu, Philippines ; Cuming. 

 This interesting species may be readily recognized, by 



its surface being curiously separated into three distinct 



patterns of sculpture. 



Species 21. (Mus. Cuming.) 

 Psammobia nitosa. Psam. testa ovaio-tratisversa, soli- 

 duld, compressiusculd, utroque latere hiante, inarqiii- 

 laterali, tratisversim snbstriatd, roseo-purpurascente, 

 macitlis sparsis niveis irroratd, latere antico breviore, 

 late rotundato, postico latiore, supei-ne recto, non de- 

 clivi, liorizo7itali, late obtuse truncato. 

 The snowy Psammobia. Shell ovately transverse, rather 

 solid, somewhat compressed, gaping on both sides, 

 inequilateral, transversely faintly striated ; rose-pur- 

 ple, bedewed with scattered snowy spots, anterior 

 side shorter, broadly rounded, posterior side broader, 

 straight at the upper part, not sloping, horizontal, 

 broadly obtusely truncated. 

 Deshayes, Pro. Zool. Soc. 1854, p. 317. 

 Hah. Dumaguete, Island of Negros, Philippines ; Cuming. 

 Closely allied to P. occidens, but uniformly distinguished 

 by the various characters detailed in the foregoing de- 

 scription. 



