174 CHILONOPSIS. 



Manual X, pp. 95, 97. Later in the same year Gray nomin- 

 ated aurisvulpina as type, but his action, forestalled by Herr- 

 mannsen, is void. 



LITERATURE. Monographic accounts of the species of 

 ChUonopsis (under various generic names) have been pub- 

 lished by T. Vernon Wollaston, Testacea Atlantica, pp. 542- 

 552 (1878), and by E. A. Smith, On the Land-shells of St. 

 Helena, in Proc. Zool. Soc. London, 1892, pp. 258-270. 



Key to Species of ChUonopsis. 



1. Whorls with a series of folds or bosses below the suture 

 (ChUonopsis s. str.). 



a. Shell large and very solid ; ovate, the diam. about 

 half the alt. ; outer lip heavily calloused. 



C. nonpareil, no. 1. 



aa. Shell small and thin ; slender, the diam. much less 

 than half the alt. ; outer lip not calloused. 



fc. Spire straightly conic; sutures deep; 8 to 9 



whorls. C. melanioides, no. 2. 



&&. Spire with convex outlines; whorls 6^/2 to 7. 



C. subplicatus, no. 3. 



2. Thin; whorls G 1 /^ to 7, smooth below the suture 

 (Cleostyla). 



a. Long-ovate, with the lip somewhat dilated below 

 and the columella slightly truncate; 28 to 31.5 

 mm. long. C. subtruncatus, no. 4. 



aa. Oblong, the lip somewhat dilated below, the colu- 

 mella very strongly truncate ; about 20 x 8 mm. 



C. exulatus, no. 5. 



aaa. Ovate-conic, very thin, usually maculate or striped 

 with whitish on a brown ground ; outer lip simple, 

 acute. Columella somewhat truncate ; about 17 x 

 7.5 mm. C. turtoni, no. 6. 



1. C. NONPAREIL (Perry). PL 52, figs. 46 to 51. 



Shell imperf orate or compressed-umbilicate, solid and heavy, 

 ovate. Whorls nearly 7, convex and slowly increasing. The 

 first half whorl is smooth, the rest are convex, deeply, coarsely 



