266 CAM JENA. 



ular, delicate spiral stride. Spire obtuse, whorls 5s, slightly convex, 

 separated by a linear suture ; the first whorl unicolored huffish, the 

 last begirt with narrow, unequally spaced brown lines. Last whorl 

 acutely carinated at the periphery, brown, having about 12 unequally 

 spaced brown lines. Aperture not descending, rhomboidal, trans- 

 verse. Coluraella white, the columellar callus almost entirely clos- 

 ing the umbilicus ; lip reflexed, whitish, angulate. 

 Alt. 20, greater diam. 40, lesser 33 mill. (Morlet.) 



Long-son, Tonquin. 



Helix longsonensis MORLET, Journ. Conch. 1891, p. 26; H. 

 (Hadra) longsonensis MORLET, ibid., p. 244, 248, t. 5, f. 3. 



Smaller and thinner than the preceding, and having the umbilicus 

 almost closed. 



(Section Phcenicobius Morch, 1852.) 



Phcenicobius MORCH, Catal. Yoldi, p. 32 (genus of Pupidse). 

 MARTENS, in ALB., Die Hel., p. 177, 1860 (section of Cochlostyla). 

 PFR.-CLESS., Nomencl. Hel. Viv., p. 210, 1878 (section of Cochlo- 

 styla). MOLLENDORFF, Nachrichtsbl D. M. Ges. 1891, p. 202 (sub- 

 genus of Camrena.) 



Shell like Camsena in the large embryonal portion, consisting of 

 about 2i whorls ; differing from Camsena in being generally more 

 elevated, sometimes pupiform, and in having (typically) four dark 

 spiral bands. Type H. arata Sowb. 



To Dr. O. von Mollendorff belongs the credit of first announcing 

 the fact that this group belongs to.Camafla, instead of to Cochloetyla, 

 where previous authors had placed it. The fact is, that the species 

 of this section are very closely allied to the Philippine species traillii, 

 monochroa, etc., and if the section Phcenicobius be retained, it must 

 be enlarged to include these forms. 



Those who have had occasion to study large series of Oriental 

 Helices are aware that the system of banding is quite different from 

 that of the true Helix of Europe. The band-formula originated by 

 Martens pfoe for the latter is quite inapplicable to the genera Hadra, 

 Camrcna, etc. The patterns are evidently of independent origin, 

 having been evolved since the divergence of the principal Helicoid 

 stocks. 



Now in Camcena the bands are as follows: i, sutural ; ii, supra- 

 peripheral ; iii, infra-peripheral ; iv, umbilical. The bands ii and 



