160 LITTORtNIOE. 



Judging from this single specimen, a very distinct small 

 form. Sub-tuberculate above, striate [instead of sulcate] 

 below. Perhaps the form described by Smith, 1. c., as found by 

 Brazier at the Marshall Islands. 



var. [? dist. sp.]. 



Long. 3, diam. 2| mil. Differs from the Arakan form of 

 J2. isseli by the still narrower perforation, more convex base, 

 with more regular and more numerous spiral sulcations. 



8 Cherboniane Reef ; coll. Dr. J, Armstrong. 



2 Mauritius ; ex c. Dr. F. Stolizcka [in bad condition ; identification 



doubtful]. 



var. subinfracostata [? dist. sp.]. 



Probably distinct; the specimens have their opercula, but 

 are perhaps not quite adult ? Descr. de 1'Egypte, PL V, fig. 40, 

 gives a good idea of them. It is perhaps rather a var. of that 

 species, It. infracostata. Issel ? 



3 Nicobar Islands ; coll. Dr. F. Stoliczka. 



6. Risella [Peasiella] conoidalis. 



Trochus conoidalis, Pease, Amer. Journ. Conch. Ill, 1867, Paumotus ; alt. 5, 

 diam. 4 mil. 



3 Paumotus [typical] j coll. H. Pease, Esq. 



7. Kisella [Peasiella] infracostata. 



Risella infracostata, Issel, Malac. Mar Rosso, 1864, Suez and Desc. de 

 VEgypte, pi. V, fig. 40. 



6 Massaua ; coll. Prof. A. Issel. 



Sent me as " Troch. sismondce, Iss.", probably a lapsus 

 calami ? I am inclined to believe it can only be separated from 

 the following as a variety ; my Aden specimens seem a fairly 

 intermediate form. 



8. Bisella [Peasiella] isseli. 



Risella isseli, Semper, Issel, Malac. Mar Rosso, 1S64, Suez and Z^inzi- 

 lar; Descr. de VEgypte, pi. V,fig. 35. 



