4 nYDROC'ENIUvi:. 



6. Hydrocena (Georissa) frustillum (Benson). 



Hydrocena (Georissa) fntstilluni (Benson). A. M. N. II. ser. 3, vi, 

 1860, p. 193 (as Hydrocena) \ Pfeiffer, Mon. Pneuni. iii, p. 251; 

 H. & T., C. I. pi. 117, tig. o (as Hydroccsna). 



Orir/inal description : — Testa imperforata, ovato-oblonga, solidi- 

 uscula, spiraliter confertissime tenuisiilcata, .succinea? ; spira 

 suhpyramidata, apice obtusiusculo, sutura inipressa; anfractibus 5, 

 convexis, ultimo |- testae subceqnante ; apertura obliqua, tnincato- 

 ovata, superne iiecuon ad latiis sinistnim angulata, peristomato 

 tenui, non coiitinuo, pariete calloso. Operc. — ? 



Alt. 2*5, diara. 1'75 inni. 



Bab. Ava. 



Differing from O. ille.v (Benson), " in the absence of the very 

 elongate slender spii-e of that species, in the want of an umbilicus, 

 and in the form of the aperture, which presents iiiter/ially an 

 angle at the junction of the columellar lip.'' 



7. Hydrocena (G-eorissa) rawesiana (Benson). 



Hydrocena (Georissa) rmvesiana (Benson), A. M. N.H. .ser. 3, vi, 

 1860, p. 193 (&?, Hydrocena) \ Pfeiffer, Mon. Pneuiu. iii, p. 252; 

 Theobald & St.iliczka, J. A.S. B. xli, 1872, pt. 2, p. 332 ; H. & T, 

 C. I. pi. 117, fig. 6 (as Hydroccfna). 



Original description : — Testa in)perforata, subgloboso-conica, 

 solida, confertim spiraliter striata, luteo-albida; spira conica, apice 

 obtnso, sutura prol'iuidiuscula : anfractibus 4, valde convexis, 

 ultimo spiram subtequante ; apertura vix obliqua, semicircular!, 

 superne et ad latus sinistrum angulata, peristomaie tenui, margine 

 parietali calloso, intus recto, stricto ; loco umbilicali subfoveato. 

 Operc. — ? 



Alt. 2, diam. To mm. 



Hab. JN^ear Moulraein in the Farm Caves. 



" The shell is more globose than that of H. 2\>/''^'^s, Benson, and 

 the sculpture is altogether different. In the formntion of the 

 aperture there is an approach to that of IJ. frastiUam, but it 

 exhibits a straight knife-like edge at tlie internal parietal 

 marefin." 



8. Hydrocena (Georissa) blanfordiana, Stoliczl-a. 



Hydrocena {Georissa) blanfordiana, Stoliczka, J.A.S. B. xl, 1871, 

 pt. 2, pp. 157-158, pi, (5, tig. 6 ; xli, 1873, pt. 2, p. 3-32 ; H. & T., 

 C. I. pi. cxvii, fig. 2 (as Hydroceena). 



Original descrijUion: — Testa globoso conoidea, imperforata, 

 moderate solidula, luteola, apice rubescente, mammillato lajvissimo; 

 anfractibus 3|, convexiusculis, transversaliter striis incrementi 

 minutis tectis, subhievigatis ; ultimo ad peripheriam rotundato, in 

 altitudiue spiram suba^quaute ; apertura late semilunari ; labro, 



