puosoPEAS. 365 



plauulatus, ultimo ad peripheriam subangulato ; apertura vix 

 obliqua, ovato-elliptica, iutus cceruleo-albida, luargiiie dextro tenui, 

 acuto, coluuiellari calloso, ])lanato, expaiisiufscido, versus basin 

 leviter emarginato, mai-ti;inibus callo tenui expanse junctis. 



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

 {Benson.) 



Hah. Andaman Islands : Port Blair {] ftmgliton) ; Andaman 

 Island (tStoliczl'a, lloepstorff., Xevill). 



"Two typical examples of this species before me measure: 

 length 27, diam. 10"7, length ot: aperture 10"o mm., and 28, 11, 

 lO'T mm., botli liaving a trifle over seven whorls. Tbey are solid, 

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

 The columella is distinctly sigmoid, and the ])arietal callus arising 

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

 P.pealei:' {Filshry.) 



Var. oxynter, Benson, A. M. N. H. ser. 3, xi, 1S63, p. 90 ; 

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

 named) ; Pilsbiy, Man. Conch, ser. 2, xviii, 1906, p. 28, pi. G, 

 figs. 77, 82-84. 



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

 There is a tendency in the stouter form to \'erge towards the 

 variety which I have called oxynter, although tlie extreme speci- 

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



Hah. Andaman Islands : Port Blair (Haur/Jdon). 



Two specimens referable to this form are figured by Pilsbry. 

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

 F. peaJei chiefly in the shape and direction of the columellar 

 margin, which is less sinuous than in F. liauyhtoni. Length 34, 

 <liam. 10, length of aperture 10 mm. ; whorls 8.^." 



331. Prosopeas achates, March. 



Bulimus (Frosoj)eas) ac/ia/cs, Moich. .Tourn. Conchyl. 1875, p. 359. 

 IStenofiyra {Froso^ycas) achates, Nevill, Hand List, i, 1878, p. 173. 

 Stenoqyra (Opens) acliates, Pieitler & Clessin, Xomeiicl. Helic. Viv 



188i, p. 320. 

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



pi. 12, figs. 4, 5. 



Oriylnal description :■ — "Differt a pra^eedente [B. (Fr.) roepstorji] 

 testa minore, abbreviata, obtecte perforata. 



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



Hah. Nicobar Islands {Stoliczha) ; Ivamorta, Kancouri {Koep- 

 •storff) ; Kamorta, Katchal, var. /3 {Roepstorff) ; Nancouri, var. y 

 {Boepstorff). 



Morch quotes Stenoyyra achatinacea, Pfeifl'er, as a synonvm, 

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

 •course. The latter figures a Xicobar shell which he considers to 

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



