28 PROCEEDINGS OF THE MALACOLOGICAL SOCIETT. 



ON THE CLAUSILLT: of SUMATRA, WITH DESCRIPTIONS OF 

 TWO NEW SPECIES AND A NEW VARIETY. 



By E. E. Sykes, F.Z.S. 



Read July Uth, 1893. 



At present there are, I believe, only four species of ClausUia 

 described from Sumatra. I am now able to add two more. 

 ])()ubtless, when tliis large island is more thoroughly explored, 

 and the vast mountain ranges of Barisan, with the islands to the 

 south, have been searched, many others will be discovered. 



The species already described are as follows : — 



C. Sumatrana, v. Mts., with the vars. attenuata v. Mts., hrevior 

 V. Mts. 



C. J^xcurrens, v. Mts. 



C. Obesa^ v. Mts., with the var. gracilior v. Mts. 



C. Altieola, v. Mts. 



The species which I propose to add are the following : — 



Clausllia ^:nigmatica, n. sp. 



Testa elongate fusiformis, solidula, striatula, olivacco-fusca, ad 

 suturam pallidior ; anfr. 10 convexiusculi, sutura simplice ; apertura 

 auriformis ; intus fusco-cornea, peristomate refiexo, crassulo, albo, 

 undifiue soluto ; lamella superior valida, ad marginem attingens, 

 lamella inferior et lamella subcolumellaris subparaUela), debiliores, 

 fere ad marginem attingcntes ; plicae palatales 4 extus conspicufB, 

 suprema (principalis) elougata, secunda et quarta a^qualcs, minores, 

 tcrtia minima. Alt. Ibh; mm. ; hit. antepen. 6, pen. 4 ; alt. apert. 

 6^ lat. 4|^ mm. Hah. — Sawahs and Hoodjoeng, Sumatra. 



ClausUia (Euigmatica, n.sp. 



C. miigmatica is in form half-way between C ohesa and the var. 

 gracilior; it is slightly larger than either. The penultimate whorl 

 is not so broad as the antepenultimate whorl in C. (cnigmatica, while 

 the converse is the case in C. ohesa. The mouth is larger and more 

 rounded in C. (cnigmaiica. The plicae palatales are, judging from 

 Yon Marten's figaire of C. ohesa var. gracilior^ differently proportioned, 



1 M. Weber: Zool. Ergebn. Reise Niederland. Ind. ii. 1891, p. 244, tab xiv 



fi"-s. 15-18. 



