I'liYsii).?:. 127 



25^. Planorbis (Segmentina) calathus (Benson). 



Planorbia (Secpnenthia) calatJms (Henson), A. -NI. X. 11. ser. '2, v. 

 1860, p. 348; II. k T., C. 1. pi. 34, figs. 1-;}; Sowerby, in 

 Reeve, Conch. Icon. xx. pi. 4. fig-. 30; Clessin in Conch. -Cab. 

 1884, p. 130, pi. 15, fi-. 1:5. 



Oriyinal description: — Testa nitidiuscula, albido-coniea, \A 

 lutescente cornea, subdiapliaiia, exiliter radiato-striata, supra con- 

 vexa, versus apicein pkuulata, apice coiicavo, sutura impressa ; 

 anfr. 4, ultimo extus depresso, iiiferne aiigulato, intus laiiiinis 

 denticulisque radiatis frequentiorlbus muiiito, subtus subplanato, 

 versus unibilicum angustuni, profundum excaAato ; aportura 

 obliqua, cordato sagittata intus remote labiata, margitie superiori 

 arcuato. promiueute, interiori subrecto, recedente. 



Alt. -, diam. niaj. 4"06, diam. min. 4 mm. 



Hah. Bliimtal and Neini Tal, in the Kemaoii Kegion ot" the- 

 Himalayas; Moradabad ; Ivattiawar ; Ceylon; Kashmir, etc. 



Apparently very local, but abundant Avliere found. 



2o9. Planorbis (Segmentina) caenosus {Benson). 



Planorbis [Seqincjitina) crcnosus (Henson), A. M. N. H. ser. 2, v, 

 1850, p. 349; II. & T., C. 1. pi. 39, figs. 7, 8; Sowerby, in 

 Reeve, Conch. Icon, xx, pl. 10, tig. 78; Clessin, in Conch.-Cab. 

 1884, p. 165, pl. 24, fig. 4. 



Original description : — Testa nitida, luteo-cornea vel olivaceo- 

 trornea, oblique et rude (prcecipue subtus) radiato-striata, sub- 

 •dia])hana, supra depresso-convexa ; spira parvula, apice excavato ; 

 sutura impressa; anfr. 3;|, ultimo majori, extus depressiusculo. 

 inferne carinaLo, subtus planato, versus umbilicum niajorem 

 leviter excavato; apertura obliqua, sagittiformi, margine superiori 

 arcuato, proniinente inferior! recedente, recto. 



Alt. 1"5, diam. niaj. 6, diam. min. 5 mm. 



Hah. IMoradabad ; Ceylon. 



Differing from P. (>S',) calathus in having no internal laminae and 

 in being more depressed and more angular at the keel ; moreover 

 the relative dimensions are not the same. 



Family PHYSID.i:. 



Subfamily PHYSIN.E. 



Shell fusiform or ovately fusiform, sinistral, horny. 

 Distrihntion. A\'orld-wicle. 



Genus PHYSA. 



iV///,sY/, Drapavnaiul, Tabl. ]\[oll. France, 1801, p. 52, a: Ili^t. Xat. 

 Moll. Terr. Fluv. France, p. 54. 



