HELIX-IIADRA. 125 



H. mandarina GKAY, Zool. of Beechey's Voyage, p. 143, t. 38, f. 

 2, 3. PFR. Monog. Hel. Viv. i, p. 255 ; Conchyl. Cab., p. 375, t. 

 140, f. 15, 16. REEVE, Conch. Icon., f. 401. 



A solid, turbinate shell, peculiar in its elevated contour and solid 

 axis. Two of the trays before me are marked " Bonin Is.," probably 

 erroneously. All of the shells I have seen (13 specimens, received 

 from five sources) are devoid of epidermis. Several of them have 

 been inhabited by hermit crabs. 



(Species of doubtful position.) 



H. PRIMEANA Crosse. PL 31, figs. 30, 31. 



Shell umbilicated, depressed, little thickened, somewhat solid, 

 longitudinally rugose-striate, unicolored, pale brown ; spire little ele- 

 vated, obtuse ; suture light, impressed. Whorls 5, a trifle convex, 

 slowly widening, the last not descending in front ; periphery acutely 

 carinated, more convex beneath the carina, obsoletely rugate-striate ; 

 umbilicus moderate, subcylindrical ; aperture oblique, rounded- 

 lunar, subangulated at the position of the carina, dirty white inside; 

 peristome whitish, upper margin narrowly expanded, basal and col- 

 umellar thickened, reflexed. (Crosse.) 



Alt. 12, greater diam. 26, lesser 23* mill. 



China ? 



H. primeana CRSE., Journ. de Conchyl. 1864, p. 284 ; 1. c. 1866, 

 p. 57, t. 1, f. 3. PFR. Monogr. v, p. 403. 



Compared by Crosse to If. ( Oxytes) pallasiana. It is placed by 

 Pfeiffer in Camcena, but is probably an Oxytes. It differs from If. 

 connivens and its allies in lacking the fine spiral lines characteristic 

 of that group of species. 



Section II. HADRA Albers, 1860. 



Hadra ALB. Die Heliceen, edit. Martens, p. 165. Type H. bi- 

 partita Fer. 



This section is accepted with nearly the original limits, except 

 that a part of the species included here in Die Heliceen belong, in 

 my opinion, to Camcena and Euhadra. The residue form a group 

 of closely allied forms, distributed throughout the Australasian 

 zoological province (Australia, New Guinea, Salomon Is., etc.), and 

 very characteristic of those regions. The subsections Hadra (re- 

 stricted), Sphcerospira and Badistes do not seem to have much in- 



