100 M. E. Kegel on Parthenogenesis. 



Oibo and MombaSj through a range of 11 degrees of latitude, on 

 the east coast of Africa. B. punctatus ranges northwards from 

 Ceylon, and attains the bank of the Ganges at a single spot, 

 Bithoura, near Futtehpore, nearly opposite to the scene of the 

 recent defeat of Beni Madho, at Dhoondiakhera, by the forces 

 under Lord Clyde. 

 B. vesiculatus is from the same locality as the preceding species. 



Omphalotropis Harpula, nobis. 



Testa subumbilicata, ovato-conica, solidula, oblique coufertim flexuose 

 costata, costis elevatis compressis, rufescente, albido obscure mar- 

 morata ; spira gradatim conica, apice acutiusculo, saturate rubro, 

 sutura profunda; anfractibus 5 convexiusculis, superne prope 

 suturam angulatis, postreinis sulco remotiusculo leviter impresso 

 sculptis, ultimo couvexo, carina basali elevatiuscula munito ; aper- 

 tura verticali, pyriformi. peristomate simplici acuto, marginibus 

 callo appresso arcuate junctis, columellari expansiusculo, undulate. 



Operc. 1 



Long. 6, diam. 4 mill. 

 Habitat in insula Mauritii. 



The deep suture, in conjunction with the peculiar formation 

 of the upper portion of the whorls, sufficiently distinguishes this 

 little shell from the ribbed O. multilirata, Pfr. 



Dr. Pfeiffer now includes his genus Omphalotropis, under the 

 designation of a section, in the genus Hydrucena, Parreyss. It 

 forms a very natural group. 



That distinguished author has, in his Supplement, described 

 a shell, with a mark of doubt, as Cyclophorus aquivocus, the 

 habit of the shell, as he remarks, associating it with Cyclostomus, 

 while the formation of the peristome appeared not to be con- 

 formable with that genus. 



A specimen, obtained by Sir David Barclay, in better order 

 than the type in Mr. Cuming's collection, and provided with its 

 closely fitting calcareous operculum, proves the shell to be a 

 true Cyclostomus. It was received from a whaler, who cited the 

 east coast of Africa as its habitat. The operculum is milk-white, 

 with a blackish centre, slightly concave, and wdth 5^ slightly 

 corrugated whorls. 



Cheltenham, January 12, 1859. 



XIV. — On Parthenogenesis. By E. Kegel*. 



Thousands of accurately observed cases bear evidence that an 

 embryo can be developed in a seed only under the influence of 

 fecundation. A few naturahsts did, indeed, up to the beginning 

 * Botanische Zeitung, Oct. 8, 1858. Translated by Arthur Henfrey, 

 F.R.S. &c. 



