90 JOURNAL OF CONCHOLOGV. 



ON SOME SHELLS FROM EASTERN BOLIVL\ 

 AND WESTERN BRAZIL. 



r,Y C. F. ANCEY. 



(Read before the Conchological Society, July '^/th, 1S92.) 



Streptaxis comboides D'Orbigny. 

 Province of Matto-Grosso, Brazil ; originally found in Bolivia 

 (Chiquitos), by Alec. d'Orbigny. 



Streptaxis decipiens Crosse. 

 Matto-Grosso, Brazil (Germain). 



This species, allied to the preceding one, was doubtfully 

 assigned by Crosse to ' Chili,' on the faith of Mr. Bryce 

 AVright. It is more than probable that the above statement is 

 erroneous and I even doubt the existence in Chili of any 

 species of the genus. 



Happia dal liana Anc, n. sp. 



Testa depressa, ini'ni//ia, lucide cornea, nitlda, perienuis, aperte 

 utnbilicata ( uinbilicus circa \ diametrl crquans), supra striis 

 radiaiitibiis distantibiisqiie, prcBterea lineisincreDienti tenuiori- 

 bus iinpressa, infra fere kevis. Spira convexa, obii/sa, 

 parian e/evata ; anfractus 5, regulariier lenteqiie crescentes, 

 coni'exi, sutiira inipressa, ultinius cylindricus, circa unibilicum 

 rotujidatus ; apertura snbobliqua, Innato-roiundata ; peris- 

 toma simplex, acutuni. 



Diam. maj. 3 J:, 7niti. 3, alt. i| mill. 



Santa Cruz de la Sierra, Eastern Bolivia (Germain). 



I follow M. Bourguignat in separating from the genuine .S^r^/- 

 taxis such shells as Helix orbicula, H. oinaloniorpha and others 

 to which the subgeneric name of Ammonoceras has been applied. 

 This being preoccupied, he rightly changed it to Happia. 



The small species under consideration is very distinct from 

 its congeners, and at once recalls a small Hyalinia nitida with 

 radiating strite, until the true generic atitinities are perceived. I 

 know of no species I may compare with this. 



I have much pleasure in associating this with the name of 

 Dr. Wm. H. Dall, of Washington, D.C. 



J.C, vli., July, iSg2. 



