28 Mr. W. H. Benson on a new Species of Alycseus. 



of the ordinary kind in wliicli the spines have the greatest 

 deviation from a right angle, 55°. 



In the relative position of the lateral spines, although not in 

 respect to their length, the ordinary H. trispinosa is in some 

 degree represented hy H. inflexa, while the variety {inucronata) 

 has a partial representative in H. lahiata. There appear to be 

 considerable grounds for regarding it, with D'Orbigny, as a 

 distinct species. 



Cheltenham, Nov. 29, 1860. 



V. — Description of a new Alyc?eus from the Andaman Islands ; 

 ivith Notes on other Indian Cyclostomacca. By W. H. Ben- 

 son, Esq. 



Alycaus Andamanice, B., n. sp. 

 A. testa aperte umbilicata, conoideo-depressa, remote radiato-plica- 

 tula, plicis regionis iuflatse confertis costulatis, superne subtusque 

 ruo-is ilexuosis spiralibus remotiusculis scidpta, ferrugiueo-rubente, 

 apice rubido, subtus pallidiore, pone aperturam cornea; spira 

 primo planiuscula, apiccm versus papillarem obtusurn exserta, 

 sutura profundiuscula ; anfractibus 4, convexis, ultimo rotundato 

 antice descendente, tubulo suturali retroverso brevi ; apertura ma- 

 juscula circular! Integra ; peristomate subduplici, margine uudique 



expansiusculo, extus fuscato. Operc. ? 



Diam. major .5, minor 4, alt. 3 mill. 



Habitat ad Portum Blair Insulse AndamauicDe. Collegit Capt. 

 J. C. Haughton. 



I am* indebted for a single specimen of this very distinct spe- 

 cies of the typical section to the present Superintendent of the 

 Penal Settlement. Including Al. expatriatus, Bl., from the Nil- 

 gherries, described in a late Number of the 'Journal of the 

 Asiatic Society of Calcutta,' and a new species, also belonging to 

 the section Charax, from another hill range in Southern India, 

 to be described by ]\Ir. W. T. Blanford, the number of known 

 species of Ahjcams now amounts to twenty-five. 



Alycmis distortus, Haines, was conjecturally assigned, in the 

 'Annals of Natural Plistory' for March 1859, to the section 

 Diori/x. This location appears, on reference. to Haines's figures, 

 lately received, to be correct ; however, the black blotches caused 

 by the use of an inferior description of white paint in colouring 

 the plate have, as in most of the Continental works on Concho- 

 logy, made it difficult to ascertain the true characters of the 

 shell. 



A curious variety of Ahjcmis Amphora was sent to me from 

 Moulmein by Major Sankey. Besides a stronger angulation at 



