8 HELIX-STEGODERA. 



Heude mentions a rare form, corneous or pure white within. The 

 animal is grayish-black, with a yellow dorsal line ; the foot is black- 

 ish, bordered with white. 



This is one of the strangest forms of Helix. The whorls are 

 regular in increase until the latter half of the last, which is straight- 

 ened, concealing part of the spire, and excessively narrow in the 

 throat. The specimens before me are even more marked in these 

 anomalous characters than those figured by Von Martens. They 



are also larger than the figures on pi. I. 







Section II. TRAUMATOPHORA Ancev, 1887. 



* ' 



Traumatophora ANC. in the Conchologists' Exchange, April, 1887, 

 p. 54. 



H. TRISCALPTA Martens. PI. 1, figs. 1, 2, 3, 4, 5, 6, 7, 8. 



Shell depressed, umbilicate, obliquely irregularly striate above, 

 pale ; whorls 5, forming a slightly convex spire, slowly widening, the 

 first smooth, obliquely protruding, the last rounded, inflated beneath, 

 suddenly passing into the moderate umbilicus ; before reaching the 

 aperture the whorl is constricted and marked by three linear, 

 angular, obliquely descending impressions, then it suddenly descends. 

 Aperture small, very oblique to the axis, rounded-lunar ; peristome 

 thickened, reflexed, white, with two lip folds within, and a third basal 

 fold, none of which extend to the edge of the peristome. {Martens.'} 



Alt. 14, greater diam. 31, lesser 25 mill. 



Alt. 13-18, greater diam. 28-38, lesser 23-32 mill. 



Between the Yang-tse-Kiang and its affluents, Han-Kiang and 

 Hwai ; Province of Hu-pe (Heude) ; around Lake Po-yang, Province 

 of Kiang-si, China. 



H. triscalpta MARTENS, Sitz. Ges. nat. Fr. Berlin, Jan. 1875, p. 

 2; Mai. Bl. xxii, 1875, p. 185. PFR., Monographia vii, p. 443; 

 Novitates Couch, iv, p. 148, t. 184, f. 1-4. HEUDE, Notes sur les 

 Moll. Terr, de la Vallee du Fleuve Bleu, p. 35, t. 15, f. 7. 



It is not a common species, according to Heude, but inhabits a 

 vast area. On the Yang-tse-Kiang River, between Hwang-tchou 

 and Kiou-Kiang, Province of Hu-pe, there is a small variety, with 

 flattened spire. The large variety prefers an altitude of 1200 to 

 1500 meters, it inhabits the triangle formed by the confluence of 

 the Han-Kiang with the Yang-tse-Kiang. 



The animal, according to Heude, is blackish-ashen above, livid 

 white beneath ; it is slender, the head more attenuated. 



