28 Mr. W. H. Benson on a new Species 0/ Alycseus. 



of the ordinary kind in wliich 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 by //. inflexa, while the variety {mucronata) 

 has a partial representative in H. labiata. 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 Alyca3us from the Andaman Islands ; 

 with Notes on other Indian Cyclostomacea. By W. H. Ben- 

 son, Esq. 



Ahjcceus Ajidamania, B., n. sp. 



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

 tula, plieis regionis inflatse confertis costulatis, superne subtusque 

 rugis flexuosis spiralibus remotiusculis sculpta, ferrugiueo-rubente, 

 apice rubido, subtus pallidiore, pone aperturam cornea; spira 

 primo planiuscula, apicem versus papillarem obtusum exserta, 

 sutura profundiuscula ; anfractibus 4, convexis, ultimo rotundato 

 antice descendente, tubulo suturali retroverso brevi ; apertura ma- 

 juscula circular! Integra ; peristomate subduplici, margine undique 

 expansiusculo, extus fuscato. Operc. 1 



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



Habitat ad Portum Blair Insulse iVndamanicse. Collegit Capt. 

 J. C. Haugbton. 



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 Mr. W. T. Blanford, the number of known 

 species of Ahjcceus now amounts to twenty-five. 



Alycaus distortus, Haines, was conjectural ly assigned, in the 

 'Annals of Natural History^ for March 1859, to the section 

 Dioryx. 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 Alyccnus Amphora was sent to me from 

 Moulmein by Major Sankey. Besides a stronger angulation at 



