HELIX-CAM.ENA. 205 



A handsome shell, allied to H. xanthoderma but more elevated, 

 and with the umbilical perforation not completely covered by the 

 reflexed columellar lip. The measurement last given above is from 

 Mollendorff. The others are from shells before me. This shell has 

 a certain resemblance to the Australian helices included in the sec- 

 tion Sphcerospira. It may be separated at once from them by its 

 surface-sculpture and large nucleus. 



H. GABRIELL^; Dautzenberg & d'Hamonville. PI. 42, figs. 26, 27. 

 Shell narrowly but profoundly umbilicated. Spire slightly 

 elevated. Whorls 6, a little convex, sculptured by arcuate striae 

 and very irregular wrinkles. Last whorl scarcely descending in 

 front, the base convex, subangulated at the periphery. Aperture 

 lunate-subquadrate. Columella oblique, reflexed at the perforation ; 

 lip reflexed, margins joined by a very thin shining callus. Color 

 grayish-buff, with a rufous line at the periphery. Peristome white. 

 (Dautz. & Hamon.} Alt. 24, greater diam. 32, lesser 28 mill. 



Road of Bac-Ninh, at Lang-Son, Tonquin. 



H. gabriellce DAUTZ. & HAMONV. Journ. de Conchyl. 1887, p. 

 216, t. 8, f. 2. Hadra Gabriellce ANCEY, Le Naturaliste, 1888, p. 

 71, fig. l.H. bathmophora MABILLE, Bull. Soc. Mai. Fr. 1887.- 

 H. bathymophora (typog. err.) in this volume, antea p. 120. 



According to Ancey (I. c.) the H. batkmophora of Mabille is a 

 synonym. I cannot tell whether that species belongs where I have 

 placed it or here in Camcena, without knowing whether its nucleus 

 is large or minute. If bathmophora really prove a synonym of 

 gabriellce (which I have no reason to doubt), it is likely that H. 

 jaculata of Mabille will also be found to belong to Camcena. 



It is more depressed than H. hainanensis, smaller, with slenderer 

 spire and different coloration. The following variety seems to me to 

 stand intermediate between hainanensis and gabriellce. The species 

 xanthoderma, hainanensis, gabriellce and their varieties will probably 

 be found to constitute a continuous series of modifications, when full 

 collections are made. 



Var. SUBHAINANENSIS Pilsbry. PL 42, fig. 28. 



Shell smaller, less elevated than hainanensis, with more conoidal, 

 more acute but less elevated spire; whorls 5, rapidly widening, 

 sculptured as in hainanensis; color a light straw tint, encircling by 

 a chestnut zone at periphery, visible above the suture on the penulti- 

 mate whorl, the specimen before me having three brown lines above 



