40 RIIIOSTOMA. 



tubulo iraperfecto, antice aperto, sinistrorse erecto, rimam co- 

 ronante, munito ; umbilico perspcctivo, profundo. — Operculo 

 testaceo, multispirato, breviter cylinclrico, apice planato, laevi- 

 gato, anfractibus arcte convolutis, marginibus acute carinatis, 

 spatiis intersitis epidermide scabra vestitis, intus profunde 

 excavato polito. — Diam. maj. 21, min. 11, axis 8i/o mill.'' (B.) 



Rhiosloma Hmightoni Beris. in Ann. and Mag. nat. hist. 3 d. ser. V. p. 96. 



Pteroctjchs Hcmghioni Rceve Conch. ic. sp. 30. t. 5. 



Habitat ad cavernam Damatha, non procul ab urbe Moul- 

 mein (J. C. Haughton). 



2(8. 5. Rli. teueruin ITIenke- 



T. umbilicata, depressa, tenera, costis prominentibus 

 membranaceis munita, pellucida, virenti-cornea; spira medio 

 vix elevata ; anfr. 5 convexiusculi , ultimus teres, antice bre- 

 viter solutus, dorso crenulatus, vix carinatus ; umbilicus latus, 

 ~l~^ diametri subaequans; apertura parnm obliqua, subcircu- 

 laris, intus leviter margaritacea ; perist. subduplex: internum 

 superne breviter incisum , praeterea subadnatum , externum 

 brevissime patens, incisuram prominentia levi tubuliformi ob- 

 tegens. — Operc. fere Opisthopori. — Diam. maj. 17, min. 

 13, alt. 6 mill. Apert. diam. 52/3 mill. (Coll. Nr. 46.) 



Pteroryclos tencr Menke in Malak. Bl. III. 1856. p. 96. 



_ _ Pfr, Novit. coneh. I. p. 90. n. 154. t. 25. f. 13—15. 



— — Pfr. Mon. Pneum. Suppl. p. 32 



— — Reeve Conch. ic. sp. 28. t. 5. 



Rhtostoma tener Bens. in Ann. and Mag. nat. hist. 3 d. ser. V. p. 97. 

 Habitat Touranne Cochinchinae. 



219. 6. Rh. Bernardii Pfr. 



T. late umbilicata, subdiscoidea, soHdula, capillaceo-striata, 

 sericea, olivaceo-fulva ; spira parum elevata, vertice minuto, 

 prominulo ; anfr. 5 convexi, ultimus teres, juxta suturara tumi- 

 dus et leviter sulcatus , antice solutus et supra incisuram 

 peristomatis tubulo brevi curvatulo munitus ; apertura Hbera, 

 fere verticalis, circularis; perist. subincrassatum, breviter ex- 

 pansum. — Operc? — Diam. maj, 15, min. 12, alt. 7 mill. 

 (Coll. Bernardi.) 



Rhiostoma Bernardii Pfr. in Journ. Conch. X. (1862.) p. 45. t. 6. f. 5. 



