404 Mr. W. H. Benson on some new species of Helix. 



I have dried many specimens on mica with the tentacula expanded. 

 It appears to be, like others of its class, a delicate animal, and 

 does not survive long in captivity. 



A sertularian zoophyte noticed by Dalyell under the name of 

 Sertularia Arcta, and described by Dr. Hassall as Coppinia mira- 

 bilis, is frequent in the Firth of Forth, much more so in deep 

 water off Aberdeen, and has been met with by my friend Mr. 

 Peach off Peterhead. It seems to be absent from the west coast 

 of Scotland. Great confusion exists with regard to the synonymy 

 of this species. It is confounded with Campanularia intertexta 

 of Couch, a true Campanularia. 



I am, Sir, your obedient servant, 



Wyville T. C. Thomson. 



P.S. To aid in clearing up some doubts with regard to the 

 distribution of the Urchin, Arachnoides placenta, I think it right 

 to notice a specimen received from the Burmese coast. — 

 W. T. C. T. 



XXXIV. — Characters of new species of Helix from Southern 

 India and Bengal. By W. H. Benson, Esq. 



Before proceeding to the descriptions of the following species, 

 I may remark that, with the exception of Succinea Imperialis, 

 nobis (proving to be a variety of Dr. Pfeiffer's £. picta, with 

 which I was unacquainted in consequence of the delayed publica- 

 tion of the 'Zoological Proceedings' of 1849), and of Helix 

 Orobia, solata, Ampulla, cacuminifera, crinigera, and acuducta, 

 nobis, the whole of the Helicidce described in my papers contained 

 in former numbers of this Journal have been figured by Dr. 

 Pfeiffer for the Martini-Chemnitz Conchylien Cabinet. The 

 name of H. munda, nobis, has been altered by that author to H. 

 cerea, Pfr., the former designation having been applied in 1849, 

 by the American conchologist, Adams, to a Jamaican shell. The 

 Helices which I had omitted to take with me to Germany will be 

 figured in Lovell Reeve's 'Conchologia Iconica/ H. regalis, 

 nobis, from Borneo, was subsequently given in the ' Zoology of 

 the Samarang/ as H. vittata, A. & B., a name which had been 

 long applied to a Ceylonese species. The brown variety has now 

 been portrayed under the correct name of H. regalis (no. 426, 

 plate 80 of Helix) in the ' Conchologia Iconica ; ' but in neither 

 instance have the obsolete nodulose costa? on the intermediate 

 whorls of the spire been represented. 



1. Helix Cysis, nobis, n. sp. 

 Testa anguste et profunde umbilicata, sinistrorsa, depresso-globosa, 



