SOLAROPSIS-DORCASIA. 261 



and fifty specimens were collected by Dr. Stoliczka. all of approx- 

 imately the same size, at Pasrobat, Sasak Taka and Wakhan ; one 

 of the specimens from the last locality I have taken as my type of 

 var. asiatica. (Nevill.*) 



Central Asia (Nev.) ; Pyramid Id., Alaska (Krause.) 



Hel. ( Vallonia} costata var. asiatica NEV., Sci. Results of the 

 Second Yarkand Miss., p. 4. Vallonia ladacensis var. asiatica NEV. 

 REINHARD, Sitzungsber. Ges. Naturf. Freunde, Berlin, 1883, p. 42. 



Not seen by me. It needs revision, as to the identity of the 

 Central-Asiatic and Alaskan forms, and also as to its specific rela- 

 tionship with ladacensis, tenera, etc. 



Genus SOLAROPSIS Beck. 



Helix catenulata ANCEY. Unfigured Bull. Soc. Mai. Fr. vii, 

 p. 151. Cayenne. Belongs to the group of andicola, catenifera, etc. 



Genus DORCASIA Gray. 



Dorcasia GRAY in PFR., Zeitschr. f. Mai., June, 1845, p. 87 ; 

 Monogr. i, p. 332, type H. alexandri (Gray) Pfr. Galaxias (pt.) 

 BECK, Index, p. 42, 1837, (-BT. globulus, rosacea, etc.), preoc. 



These South African snails have hitherto been mingled with the 

 East Asian Eulota or Acusta species, but their affinities are hardly 

 with that group. The jaw is of the aulacognath type. The genitalia 

 are unknown, but the digestive tract has been figured in Ber. d. 

 Senckenb. Naturf. Ges. 1886, pi. 1, f. 2. Boettger has expressed the 

 opinion that H. alexandri and its allies may prove to be carnivorous 

 forms allied to Streptaxis (1. c., p. 22.) 



D. ALEXANDRI (Gray) Pfr., var. MINOR Bttg. PI. 28, figs. 98, 



99, 100. 



Shell much smaller than the type ; whorls 4, instead of 4f ; the 

 last a little subangulated at the periphery. Alt. 10-11?, diam. 21- 

 24 mill.; aperture, alt. 10-10, width 11-12 mill. Ratio of alt. to 

 diam. 1 : 2,06 (five specimens measured) ; the ratio in the typical 

 alexandri being 1 : 2,29. (Ber. d. Senck. Naturf. Ges. 1886, p. 22.) 



Southern part of the Kalahari Desert. 

 Var. ROTUNDATA Mousson. 



Shell smaller than the type, less depressed ; spire more produced. 

 Whorls 5, the last rounded, less deviating at the umbilical rimation 

 than in the type ; rib-strise visible beneath. 



