114 Mr. W. Clark on Assiminia Grayana and Rissoa anatina. 



fringed with white on the posterior border. Tail tapering, va- 

 riegated with black and rufescent hairs. Whiskers long and 

 black. 



Dimensions. — Head 1 \ inch ; body 3 inches ; tail 3 in. 



This species, although provisionally arranged in the genus 

 Sciurus, resembles in its external habit, markings, attenuated 

 tail, and minutely fringed ears, the American genus Tamias, and 

 it remains for naturalists in the higher regions of India, who 

 may examine living specimens, to determine whether it has 

 cheek-pouches, by which Tamias is distinguished from Sciurus. 



Mr. Hodgson^s collection contains a large supply of most of 

 the Indian Ungulata : many of these have been discovered, and 

 first described by himself, and are known to naturalists chiefly 

 by the copious details given in the Journal of the Asiatic Society 

 of Bengal, and by Dr. J. E. Gray's Catalogue of the collection 

 presented to the British Museum. Among the subjects as yet rare 

 in collections may be mentioned Poephagus grunniens, Linn., 

 adult and one calf., Porcula salvania, Hodgs., and Budorcas tax- 

 icolor, Hodgs.* Of the latter, Mr. Hodgson has some three 

 specimens, on the whole in good preservation ; one of these is 

 exhibited in the Museum of the East India Company, one has 

 been presented to the British Museum, and one to the Museum 

 at Leyden. A very perfect specimen of the Cervus affinis of 

 Hodgson has also been sent, and is mounted in the Museum. 

 Whether this be really a distinct species from Cei'vus Wallichii 

 of Cuvier remains still to be determined; the horns of both 

 agree in structure and subdivisions. Dr. Gray has given most 

 copious details regarding the various, multifarious synonyms 

 with which they are enumerated by authors (Cat. Mamm. Brit. 

 Mus. Partiii. Ungulata furcipcda, pp. 197 & 199). 



X. — On the Assiminia Grayana and Rissoa anatina. 

 By William Clark, Esq. 



To the Editors of the Annals of Natural History. 



Gentlemen, Exmouth, 26th June 1855. 



I BEG to present descriptions of two testaceous Gasteropoda, 

 which could not be obtained during the passage through the 

 press of my volume on the British Marine Testaceous Mol- 

 lusca. One of them, the Assiminia Grayana, is of peculiar in- 

 terest, and has caused much discussion and difference of opinion 



* These three interesting animals have been figured in the Illustrations 

 of the Proc. Zool. Hoc. for 1S53. 



