280 MR. E. A. SMITH ON SHELLS FROM [Feb. 15, 



The two specimens of this species are apparently both young, as 

 the characteristic deviating body-whorl is not yet developed. The 

 base is widely umbilicated, as in the Brazilian S. Candida. When 

 adult this must be the giant of the genus, and a most remarkable 

 shell. The costulee are strong, remarkably flexuous beneath the 

 suture, and then obliquely arcuate across the whorls ; what I have 

 described as striae upon the left side of them, or that last formed and 

 nearest the aperture, is rather a kind of pitting. 



7. Streptaxis craveni. (Plate XXXII. figs. .5, 5 a.) 



Strepaxis craveni, E. A. Smith, Annals, I.e. 



Shell narrowly umbiHcated, obliquely distorted, smooth, glossy, 

 dirty milky-whitish. Whorls 7, slightly convex, closely costulately 

 striated beneath the suture. Last whorl suddenly descending in 

 front, then rising somewhat upon the preceding whorl, very obliquely 

 deviating. Aperture oblique, edentulate ; outer lip (viewed laterally) 

 sinnated at the suture, then prominently arcuate and oblique 

 beneath, a little thickened and reflexed. Columella and basal 

 margin thickened and narrowly reflexed, the former a trifle arcuated. 

 Length from apex to base of aperture 29 millims. ; diameter of last 

 whorl 22 ; aperture 15 high, 12^ broad. 



Hub. On hills between the mouth of the river Dana and Mom- 

 basa, East Africa {Kirh). 



This is one of the finest species of Streptaxis yet discovered, and 

 remarkable on account of the peculiar outline of the labrum, the 

 smoothness and polish of its surface, and its large size. I have 

 much pleasure in naming it after my friend M r. A. E. Craven, who 

 has contributed to our knowledge of the shells of the East-African 

 region, and has also written a very important monograph of the 

 microscopic genus Sinusigera, and other valuable contributions to 

 conchological science. 



^o 



8. Streptaxis mozambicensis. (Plate XXXII. figs. 6, 6 a.) 



Streptaxis mozambicensis, E. A. Smith, Annals, /. c. 



Shell small, linearly rimate, whitish, smooth, glossy. Whorls 6, 

 convex, crenulated beneath the deep suture ; last whorl oblique, of 

 the same width as the preceding, descending in front, and briefly 

 ascending at the aperture, a trifle flattened above the aperture ; the 

 latter circularly lunate, small, edentulate ; outer hp a trifle arcuate 

 viewed laterally, oblique, narrowly expanded. Columellar margin 

 more broadly reflexed. Height 7| milUms., diameter of last whorl 

 4| ; aperture 3 long, 2g wide. 



Hab. Between Lake Nyassa and the east coast {Thomson). 



This species is smaller and less distorted than S. lirhi, Dohrn, 

 and has merely a linear umbilical fissure. It is likewise smaller 

 than S. enneoides, Martens, not perforate, smooth, and has more 

 convex whorls. 



