338 LAND AXD FEESHWAT£K 



figs. 1 &' 4 (not good) ; Theob. Suiip. Cat. 1876, p. 39 ; Nevill, 

 Hand-1. i. 1878, p. 2U5. 



Original description : — " Testa innhilicata , cleprexso-tvrhinata, 

 dense ohlique costulata ; spira conoideu,siitnra jirofundiuscula, a/>ice 

 papillari ; anfractihus 4 convexis, ultimo rotundato, ad latus injlato, 

 eo costidis confertioribus ornato, turn juxta feristoma breviter con- 

 striclo, lievi, tubulo sutur(di elongato non proeul ab apertura oriente 

 muiiito ; apertura vix obliqua, circidari ; perisiomatis Inbro, sub- 

 daplici incrassato, exteriore reflexo, interiure cremdato quadriplicato 

 aperturam vix coarctaide, labio simplici, fenui, marrjinibus ccdlo 

 crasso prominente junctis. Umbilico j'rofundo, maryvne rotundato. 



" Operculo ? 



" Diam. major 4. minor 3t, axis 3 mill. 



" Habitat in valle lUnigun." 



" The constriction of the last whorl is near the aperture, without 

 any intermediate ridge or swelling, in this res])ect showing an 

 ailinity with Amp>hora and Uriiida. In the crenulation of the 

 peristome it exhibits an analogy with sm^p^z^i* of the normal group, 

 in which the crenulations are twelve in number, witli the origin of 

 the sutural tube remote from the aperture. 



" The specimens examined are all weathered and bleached. It is 

 a singular circumstance, that each of the three natural sections of 

 Alcyceus should have an analogical connexion through the plicate 

 peristomes of sctdpiilis, plectocheilus, and crenidatus. The genus 

 Fterocijdos, as above noted, has also its analogical representative of 

 the form in P. bilabiatus ; and it is worthy of remark that it 

 claims affinity with Ahjca^us, as well as with Opnstlioporus, through 

 the aberrant P. hispidus, Pearson, which exhibits a retroveited 

 sutural siphon, althougli the stricture of the operculum, which is 

 very similar to that of its siphonless near relative, P. tenuilabiatus, 

 Metcalfe, confirms its location among the Pteroojcli." 



The specimen figured (No. 1254 E.M.) from Damsang, Western 

 Bhutan, differs somewhat from specimens I have come across 

 in Blanford's collection, No. 962, cremdatus, var. marked Namgu, 

 2500 ft., and Lingtam, Sikhim, 4000 ft., in having much stronger 

 higher costulation. There are 22 from the two localities but put 

 together in one pillbox. Ten of these have the crenulated peri- 

 stome, but 12 show no trace of it, although most are apparently 

 fully grown. Whether this variation is distinctive of one or the 

 other of the above localities it would be interesting to clear up. 



Alyceus DALiNGENsis, n. sp. (Plate CXXXIV. figs. 3-3 c.) 



Locality. Rechila Peak, Baling District, on Sikkim and Bhutan 

 Boundary (10,300 ft.). No. 12.51 B.M. Type. 



Shell narrowly umbilicated, globoselj conoid, rather solid ; 

 sculpture smooth on upper whorls, costulation near sutural tube 

 close in low relief, the tube moderately long ; colour dull ochra- 

 ceous; spire moderately high, sides flat, apex rather blunt : suture 

 impressed; whorls 4, rounded, regular in increase, constriction 



