Mr. W. H. Benson on new species of Cyclostoma. 185 



east near Bombay to its western shore. For the specimens 

 from Southern India I am indebted to Dr. T. Jerdon, the illus- 

 trator of the ornithology of that quarter ; a single species forms 

 part of Dr. Cantor's acquisitions in Pulo Penang. I shall con- 

 clude with some remarks on the geographical distribution of 

 ascertained Indian species, and on others which have been attri- 

 tributed, erroneously in my opinion, to the same country. 



1. C. Pearsoni, nobis, n. s. 



Testa umbilicata, depresso-turbinata, laevigata, obsolete spiraliter 

 striata, supra castaneo marmorata et late fasciata, subtus spiraliter 

 castaneo-lineata, fascia alba ad periphaeriam, subtus altera nigro- 

 castaneo concurrente ornata ; spira depresso-conoidea, apice acuto ; 

 anfractibus 5 convexiusculis, ultimo lato, subtus convexo ; apertura 

 vix obliqua, ampla, circulari, intus caerulescente ; peristomate ex- 

 panso, undique reflexo, laete aurantio, marginibus callo brevi junctis ; 

 umbilico subangusto, pervio, intus angustiori. 



Diam. major 42, minor 33, axis 25 mill. 



Hah. in montibus Khasya dictis, ultra fines Provinciae Bengalise, ad 

 orientem spectantes. 



Named after the late Dr. J. T. Pearson, of the Bengal Medical 

 Service, a successful investigator of the natural history of Bengal, 

 and formerly Curator of the Museum of the Asiatic Society of 

 Calcutta. To him we owe the establishment of two interesting 

 species of Pterocyclos, P. parvus and P. hispidus, in the Journal 

 of that Society, and from him I received the species now de- 

 scribed. 



In form, sculpture, and markings C. Pearsoni much resembles, 

 in the back view, the shell figured by Sowerby, no. 128. pi. 27. 

 of the ' Thesaurus/ as C. Perdix, but the spire is less acute. It 

 differs otherwise in the narrower umbilicus, in the orange colour 

 and rounded edge of the peristome (which is destitute of the 

 flatness observable in C. Perdix), as well as in the amplitude of the 

 aperture, convexity and want of keel in the whorls, and in the 

 absence of the articulated band at the suture. Can this be the 

 shell alluded to by Sowerby in the following words ? " Another 

 variety has ventricose volutions and an orange-coloured aper- 

 ture." It is probable that two or more distinct species were 

 referred by Sowerby to C. Perdix, and that he has also figured 

 two different species. 



2. C. Jerdoni, nobis, n. s. 



Testa umbilicata, depresso-turbinata, supra lineis elevatis spiralibus 

 confertissimis corrugatis, strias obliquas decussantibus, subtus striis 

 decussatis levioribus munita, albida, flammis fulguratis castaneis 

 superne, ct usque ad dimidium basis picta, fascia pallida mediana, 



