HELIX. 87 



Between LaJiat and Ipoh, valley of the Kinta river, abundant in 

 moist places in the forest. 



Philidora Hardouini DE MORG., Bull. Soc. Zool. Fr. 1885, p. 385, 

 t. 5, f. 10. 



(3) GROUP OF H. ARFAKIENSIS. ( Coliolus.} 



Coliolus TAPPARONE CANEFRI, Ann. Mus. Civ. Genov., 2d. ser., iv, 

 p. 131, 1887. 



Shell elevated-conical, many-whorled ; whorls obliquely costulate 

 and bristly ; apex obtuse, mamillar ; base depressed ; terminations 

 of the peristome connected by a callus. (T. C.) 



This section, founded upon a most singular shell, is placed by 

 Tapparone Canefri in the vicinity of the section Trochomorphoides 

 ofNevill. 



H. ARFAKIENSIS Tapparone Canefri. PI. 18, fig. 59. 



Shell trochiform, narrowly umbilicated, corneous ; spire much 

 elevated, somewhat constricted above, the apex mamillar. Whorls 

 11, the earlier 4 convex, spirally striate, the following whorls plano- 

 convex, obliquely sharply costulate, setigerous at middle and base, 

 the bristles long, nearly covering the suture ; last whorl acutely 

 carinated at the periphery, the base nearly flat, radiately, finely . 

 striated. Aperture dilated, rhombic-quadrangular, very oblique, 

 the peristome sinuous above, subexpanded, reflexed beneath, in- 

 curved and in the middle subaugulated, the margins distant, joined 

 by a thick callus. 



Alt. 1H, greater diam. 8|, lesser 1\ mill. (T. 0.) 



Hatam, Mi. Arfak, New Guinea. 



H. arfakiensis T. C., 1. c., p. 131, t. 1, f. 21. 



(4) GROUP OF H. TROCHALIA. 



Umbilicate ; depressed, strongly carinated ; the last whorl deflexed 

 in front ; aperture elliptical, peristome reflexed ; surface simply 

 striate. 



The following species has been placed in Geotrochus by Pfeiffer, 

 in Ampelitaby Tryon, and in Planispira by Nevill. It seems to me 

 to be closely allied to H. gabata Gld., merguiensis Phil., etc., species 

 belonging very close to Trachia, and probably to be included there- 

 in rather than in Plectotropis. 



