202 Mr. W. H. Benson on the Characters 



anfractibus 5 convexiusculis, pennltimo ventricosiori ; apertura 

 magna, subcirculari ; peristomate simplici, reflexo, subrevoluto, 

 niarginibus callo parietal! tenui junctis ; tubuli suturalis parte 

 externa longa, pone junctionem labri breviter areuatim elevata, 

 suturam subtus exhibente ; umbilico impervio. 



Long. 7^, diam. 5 mill. Long, apert. (peristomate incluso) 4 mill. 



Hab. prope Darjiling, in montibus Himalayanis Sikkimensibus. 

 Teste H. Blanford. 



A most interesting new form, intermediate between Dr. Pfeif- 

 fer's genus Rhaphaulus and tbe Sikkim and Burmese forms of 

 AlyccBus exhibited in A. constrictus, Urnula, and Amphora, B. 

 In the last-named shell the sutural tube commences at a very 

 short distance behind the mouth. In Streptaulus the tube is 

 first internal, and on aiTiving at the aperture is suddenly re- 

 flected, and instead of forming an opening in the lip above the 

 aperture as in R. bombycinus, or ending in a short upright tube 

 as in R. Lorraini or Chrysalis, Pfr., it describes a short arch be- 

 hind the lip, and then runs to some distance along the external 

 suture, as in Alycaus. In texture and colouring Streptaulus 

 agrees with Rhaphaulus, not with Alycaus, and it is entirely 

 deficient in the strangulation and swelling which characterize 

 the anterior portion of the last whorl in all the species of the 

 latter genus. It inhabits the same tract with Megalomastoma 

 funiculatum. None of the larger Pupiform Cyclostomacea are 

 known to travel farther towards the north-west. 



Diplommatina diplocheilus, Bens., n. s. 



Testa dextrorsa, vix rimata, ovato-conica, subfusiformi, medio ventri- 

 cosiori, solidiuscula, carneo-albida, vix translucente, leviter nitente ; 

 spira conica, apice acuto, sutura profunda ; anfractibus 6|-7 con- 

 vexis, primis costatis, 3 postremis laevioribus, antepenultimo 

 majori tumido ; apertura vertical! subauriculari, pallide carnea, 

 nitente, plica columellari valida nutante munita ; peristomate du- 

 plici, interno continue expanso, exterior! planato-expanso, infra 

 sinistre angulo saliente desinente, margine sinistro sinuato, callo 

 parietal! magno, expanso, superne suturam fere attingente, subtus 

 soluto marginem elevatum efformante. Operculo retractili. 



Long. 3, diam. 2 mill. 



Hab. ad Teria Ghat, Montium Khasia dictorum portam, satis fre- 

 quens. Teste W. Theobald. 



This shell, which, although abundant, was local on limestone 

 rocks, belongs to the division of Diplommatina with a conspi- 

 cuous plait at the edge of the aperture, described by the Messrs. 

 Adams as Paxillus, from, the Bornean type " adversa/' which 

 Mr. H. Adams now regards as a Diplommatina. The operculum 

 was remarked by Mr. Theobald when the species was freshly 

 taken. Diplommatina Huttoni, Pfr., and the two following 



