I'lSlDlLM. l:^o 



Tvrpio, PisidUuH aiaa'n-.am, Jenyiis, from Eiirupc aiul JSorlliern 

 Asia. 



Jiamie. World-wide. 



Shell small, roundly ovate or obluiuely \\edge-slia])i'd. inequi- 

 lateral ; anterior side longer than the posterior; umbones sliglitly 

 intlated behiiul : hinge bearing two cardinal teeth in each valve ; 

 right valve bearing four laterals' and the left valve two ; lateral 

 teeth strong; ligament situated on the smaller (posterior) side; 

 pallial line entire. 



Animal having the mantle lobes smootii and open ; furnished 

 with a single short (anal) siphon, with non-papillary orifice ; 

 branchial cavity indistinguishable from the ])edal cleft : foot 

 large, tongue - shaped, capable of great extension ; palpes 

 triangular, elongated. 



307. Pisidiiim clarkeanum, G. l\- H. Xevill. 



Pmdiam clarke<niuni, G. & IL Xevill, J. A. S. 15. xl. I87J, p. 9, 

 pi. 1, figv-. 4, 4 «-4 d. 



Or'ui'mal description : — Testa ventricosa, oblonga, valide iiucqui- 

 lateralis, pallide fulva ; postice elongata ac rotundata, antice 

 rotundate truncata ; umbonibus prominentibus ac lumidis; super- 

 ficie concentrice confertim striata, striis tenuibus, regularibus. 



Long. 4-5, lat. oo, diam. 8*5 mm. 



Hah. Tanks, etc., close to the Damuda at Moisraka. 



368. Pisidiiim hydaspicola, Theobald. 



Pisidiuni hijdutipicolu, Theobald, J, A. 8. B. xlvii, 1S78, p. 147. 



Original descrijition : — Testa sub-cordate ovali tenui, exilissime- 

 striata, antice rotundata, postice vix truncata. 

 J.ong. 3-4. lat. 4. diam. 2-') mm. 

 Jfa(>. Kashmir, near Shypion. 



Fig. 27. — Pi.<i(/iHin /i//(/a.</jif(il((. Tlieob. (Trpe.) x4. 



To the above scanty description is added the following note: — 

 "The nearest ally of this species is F. clarleanam, 'Sew, but it 

 more rounded in front and hardly truncated beiiind. ' 

 The ty|)e is in the British Museum. 



'J 



