risTDiL'.M. 227 



Jlal>. ToDghi, Sikkiiii, at an altitude of lU,t>()U ft. (IT. 6\ 

 Atkinson). 



The following note is appi'iided to tlie de.sci-iptioii : — " Coin- 

 paretl with F. humbaj/annm this is a smaller, Hatter and less 

 inequilatei'al sliell. . . ." 



Type in tlie British Museum. 



371. Pisidium nevillianum, TlieubaJd. 



Pi^idium )irLullliiinuii. Tlioabulcl, J. A. S. T>. xlv. ISTO, p. 188. 



(Ji'i'lhud dei<cri/>(ioii : — Testa trigoiia, tumidiuscula, tenui, 

 ina'quilaterali, postice inodice coiivexa, aiiticc elongata, suh- 

 afuminata, exiHssime eoiicentrice striata ; umbouihus la^vigatis. 



Long. 3-o0, lat. 3-GO, diain. 2-2ii niiu. 



Hub. Near liurki. 



Appears to be cliietly distinguishable from its allies by its 

 trigonal form. 



37i\ Pisidium stewarti, PresUm. 



Pi.^idhun stcioarti, Preston, Rec. liid. .Miis.. Calcutta, iii, 1909, 

 p. 116 (fig. iu text). 



OrujuKil difscriplion : — Shell sub-trigonal, rather inilated. pah" 

 yellowish brown colour, marked with line concentric lines ^f 

 growth ; umbones large ; anterior lateral teeth somewhat curved 

 with broad grooves between, posterior lateral teeth broad and 

 somewhat projecting iu rii^ht, strong and sharply curved in left 

 valve. 



Long. 2'25, lat. 3 mm. 



Hah. High Hill, Gompa, Gyantse Valley, Tibet, in a small 

 stream, among moss and stones, 14,500 feet. 



The type-specimen is in the Indian Museum, Calcutta. 



Two specimens only were obtained by Capt. F. H. Stewart, 

 I.M.S.: its nearest ally would appear to be a fossil species frou; 

 tiie tertiary deposits of Belgiuu) *. there being no known recent 

 form vesem])liug it. 



373. Pisidium zugmayeri, Weber. 



Pisiditnu zuf/mai/eri, Weber, Zool. Jalnb. Jena, xxix, I'.'lO, 

 PI). :n 0-31 I. 



Orvjinal description: — Testa ilavescens, satis solida, intcquiliitera, 

 orbiculato-ovalis, parte posteriore abbreviata, obtusa, ventriosula, 

 tenuissime striata, sulcis post intervalla inter])ositis, lineis iucre- 

 nienti signata ; umbones versus marginem posteriorem siti, rotun- 

 dati, prominuli ; dentes cardinales valvte sinistrte bini, ante 

 ximbones, superior (exterior) fere rectus, tenuis, media parte 



* J'. i:incc}i/i(ini(iii, B. B. \\'o(>d\varcl, Cat. Brit, Spec. PUkliiini in Cull. 

 Brir. Mus., I9iy. pp. l-iT-l-'M. 



q2 



