54 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Rah.— Versian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



A delicate milky-white opaque Risma, the peristome being in some 

 specimens almost, in others entirely, separated from the body- whorl, 

 this peculiarity forming the chief characteristic of differentiation in 

 the subgenus Scrobs, proposed by Dr. Boog Watson (cf. Voy. 

 Challenger, vol. xv, pp. 611, 612). I am indebted to Dr. W. H. Dall 

 for his opinion on this matter. Mr. C. Hedley ' raises it to generic rank. 



Cyclosteema gyalum,'' n.sp. PI. V, Fig. 22. 



C. testa mediocri, placentiformi, solidula, albo-straminea, anfractibus 

 5, apicali minutissimo, ultimo rapide accrescente, acute tricarinato, 

 carina una infra, juxta suturas, altera apud peripheriam, tertia 

 regionem umbilicaretu circumambiente, superficie omni sub lente 

 leniter et obscure spiraliter striolato, umbilico perprofundo et lato, 

 apertura quadratula, labro angulato, tenui. Alt. 2, diam. 5 mm. 



i7«J.— Persian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



Conspicuous for its thrice acutely keeled body-whorl, the basal 

 carina encircling the umbilicus, which is particularly large and 

 deep in comparison with the proportions of the shell. Allied to 

 C. angidatum, A. Ad., and C. Beaui, Fischer, but smaller and differing 

 altogether in form. 



FossARUs (Couthouyia) aniNQUECARiNALis, n.sp. PI. V, Fig. 19. 



F. testa anguste umbilicata, alba, oblonga, solidiuscula, versus 

 apicem rapide attenuata, anfractibus 6, quorum apicales duo, parvi, 

 glubulares, vitrei, cseteris gradatulis, supernis tribus longitudinaliter 

 obscure liratis, baud angulatis, penultimo acute bicarinato, ultimo 

 anfractu quinque carinis proedito, quarum duae, inter suturas peri- 

 pheriamque, perconspicuse et gemmuliferae, tres inter peripheriam et 

 basin minores, regionem circa umbilicarem carina duplicata fortis, 

 apertura ovato rotunda, labro extus subquinquangulari, intus simplici, 

 tenui, columella fere recta. Long. 3, lat. l"25mm. 



^«J.— Persian Gulf, Gulf of Oman, lat. 24° 58' K, long. 56° 54' E., 

 156 fathoms. 



A very small, but highly sculptured species. A few examples 

 only have, so far, occurred. 



FOSSARUS (CotTTHOUYIA) THELACME,^ n.Sp. PI. Y, Fig. 20. 



F. testa parva, profunde umbilicata, ovata, alba, hand nitente, 

 delicata, anfractibus 5, apicalibus tribus, mammosis, parvis, vitreis, 

 uniformibus inclusis, ultimo permagno, rapide acci'escente, undique 

 delicatissime et arete spiraliter striato, lineis microscopicis longi- 

 tudinaliter intertextis, apertura magna, lata, ovata, labro tenui, e:ffuso, 

 simplici. Long. 3, lat. 1-5 mm. 



1 Mem. Austr. ]\[us., vol. iv, pt. 6 (1903), p. 353. 

 '^ yvaXov, a hollow, from the wide umbilicus. 



2 6i]\r\ aK/x-ii, nipple-tipped. 



