PKOSOPEAS. 365 



planulatus, ultimo ad peripheriarn subangulato ; npertura vix 

 obliqua, ovato-elliptica, intus coeruleo-albida, margine dextro tenui, 

 -acuto, columellari calloso, planato, expansiusculo, versus basin 

 leviter einarginato, marginibus callo tenui expanse junctis. 



"Long. 20-30, diam. 10-11 mill.; ap. long, li, lat. 5 mill." 

 (Benson.) 



Hub. Andaman Islands : Port Blair (Haughton) ; Andaman 

 Island (Stoliczka, Roepstorff^ Nevill). 



"Two typical examples of this species before me measure: 

 length 27, diam. 1O7, length of aperture 1O5 mm., and 28, 11, 

 1O7 mm., botb having a trifle over seven whorls. They are solid, 

 strong shells, nearly denuded of the thin, olivaceous-yellow cuticle. 

 The columella is distinctly sigmoid, and the parietal callus arising 

 from it is wholly appressed at the edge, not raised seam-like as in 

 P.pealei." (Pilsbry.) 



Var. oxynter, Benson, A. M. N. H. ser. 3, xi, 1863, p. 90 ; 

 Hanley & Theobald, Conch. Ind. 1874, pi. 79, fig. 5 (var. un- 

 named) ; Pilsbry, Man. Conch, ser. 2, xviii, 1906, p. 28, pi. 6, 

 figs. 77, 82-84. 



" Testa elongato-turrita, graciliore. Long. 30, diam. 8 mill. 

 There is a tendency in the stouter form to verge towards the 

 variety which I have called occynter, although the extreme speci- 

 mens might be considered as separate species." (Benson.) 



Hob. Andaman Islands : Port Blair (Haughton). 



Two specimens referable to this form are figured by Pilsbry. 

 He states that " the cuticle is dark olive. They differ from 

 P. peahi chiefly in the shape and direction of the columellar 

 margin, whicli is less sinuous than in P. liauylitoni. Length 34, 

 diam. 10, length of aperture 10 mm. ; whorls 8|." 



331. Prosopeas achates, Morch. 



Bulimus (Prosopeas} achafes, Morch, Journ. Conchyl. 1875, p. 359. 

 Stenoyyra (Prosopeas) achafes, Nevill, Hand List, i, 1878, p. 173. 

 Stenogyra (Opeas) achates, Pfeitfer & Clessin, Nomencl. Helic. Viv. 



1881, p. 320. 

 Prosopeas achates, Pilsbry, Man. Conch, ser. 2, xviii, 1906, p. 27. 



pi. 12, figs. 4, 5. 



Original description : "Differt a prseeedente \B. (Pr.) roepstorji] 

 testa miiiore, abbreviate, obtecte perforate. 



" Long. 14 mill. ; lat. 5 ; long. ap. circ. 6." (March.) 



Hab. Jsicobar Islands (Stoliczka) ; Kamorta, Nancouri (Roep- 

 -storff) ; Kamorta, Katchal, var. /3 (Roepstorff) ; Nancouri, var. y 

 (Roqxtorff). 



Morch quotes Stenogyra acJiatinacea, Pfeiffer, as a synonym, 

 without, as Prof. Pilsbry aptly says, explanation of so irregular a 

 course. The latter figures a Nicobar shell which he considers to 

 *be referable to Morch's form. "It is rather obese below, sub- 



