268 Mr. W. H. Benson on the genus Cyclostoma, 



seemed to be helpful in keeping the water pure, but 1 did not 

 know how to account for it. 



Should these experiments be perfected, what would hinder 

 our keeping collections of marine animals for observation and 

 study, even in London and other inland cities ? Such a degree 

 of success as I have attained would admit of so desirable a con- 

 summation, for even in London no great difficulty would be ex- 

 perienced in having a jar of sea-water brought up once in a 

 couple of mouths. I hope to see the lovely marine Algse too, 

 that hitherto have been almost unknown except pressed between 

 the leaves of a book, growing in their native health and beauty, 

 and waving their delicate translucent fronds, on the tables of our 

 drawing-rooms and on the shelves of our conservatories. 



I remain. Gentlemen, your obedient servant, 



P. H. GossE. 

 Ilfracombe, Sept. 10, 1862. 



XXV. — Notes on the genus Cyclostoma ; and Characters of some 

 new species from India, Borneo, and Natal. By W. H. Benson, 

 Esq. 



1. Cyclostoma Nilagiricum, nobis, n. s. 



Testa umbilicata, depresso-turbinata, solida, liris spiralibus 8-9 ma- 

 joribus, quibusdam par vis obsoletis insequidistantibus interjectis 

 munita, castanea, ad peripbseriam albido-articulata, infra fascia, 

 latissima saturatiore, superne strigis radiatis angustis undatis al- 

 bidis frequentioribus, subtus rarioribus ornata ; spira ad apicem 

 exsertiuscula, obtusata ; anfractibus 5, convexiusculis, ultimo ad pe- 

 riphaeriam subfaniculato-carinato, superne aiigulato, circa suturam 

 late planato, subtus circa periomphalum excavatura l8e\T[gatum 

 compresso, umbilico mediocri profundo, subcylindrico ; apertura 

 obliqua, pyriformi-rotundata, aurantiaca, fauce cserulescente, pe- 

 ristomate expanse, incrassato, reflexiusculo, aurantiaco, breviter 

 adnato, prope umbilicum leviter sinuate, superne angulate, pro- 

 ducte, intus sulce intrante impresse. 



Diam. major 43-45, minor 34-36, axis 22-24 mill. 



Hab. ad latus eccidentale Montium " Nilgherries " teste Jerdon. 



This shell was at first supposed to be C. Indicum of Deshayes, 

 but proved to be widely different. It is allied to C. Jerdoni, 

 nobis, and to C. Ceylanicum, Pfeiffer. Cyclostoma Indicum is 

 placed by the last-mentioned author between C. validum and 

 C. linguiferum, being provided with a linguiform process to the 

 lip, near the umbilicus, of which feature, however, no notice is 

 taken by Deshayes either in his specific character or in his ex- 

 tended description. The remark in vol. viii. of the ' Annals,' 



