PTEUOCYCLUS. 99 



Benson in 1857 Avas a variety of /^ ^)«?'i;us. Lt.-Col. Godwin- 

 Austen, however, in 1888 again recorded tlie species from Burma. 



139. Pterocyclus ater, Stoliczlca. 



Ptcrocychts ater, Stoliczlca, .1. A. S. B. xl, 1871, p. 149, pi. 6, fig. 2; 

 Nev'ill, Hand List, i, 1878, p. 262 ; Kobelt & Miilk-ndorfi; Naclir. 

 Dents. Malak. Ges. xxi.x, 1897, p. 11.3; id.. Cat. Pneum. 1899, 

 p. 2.J ; Kobelt, Das Tierreich, Lief. IG, 1902, p. IGl ; id,, Concli.- 

 Cab., Cyclophoridae, ii, 1909, p. 726, pi. 105, tigs. 4-6. 



Pterocyclos ater, I'feiifer, Mou. Pueum. Suppl. 3, 1875, p. 5] ; 

 Theobald, Cat. Shells Brit. ludia, 187G, p. 87; Ilanley & Theo- 

 bald, Conch. Ind. 1876, pi. 142, figs. 5, G. 



Original description: — " Pt. testa orbiculato-planorbulari, latis- 

 sime umbilicata; apice vix exserto ; anfractibus quinis, depres.si- 

 uscule teretibus, sutiira profunda junctis, liris spiralibus tenuibus, 

 plus minusve distiucte setiferis, subdistantibus, ornatis, sub epi- 

 derraide lividis, transversaliter fulguratim castaueo notatis, epider- 

 mide scabriuscula, transversim conferte striata, indutis ; ultimo 

 anfractu ad aperturam seusim descendente ; apertura obliqua, cir- 

 culari, peristomate duplici, interno pauluUim crassiculo, ad suturam 

 emarginato, externo tenui, dilatato, supra in alam aiigustaiii, 

 curvatam, atque ad anf. penultimum leviter afiixam expanse, pone 

 alain perforate. Diam. maj. 16"5, d. min. 13-5, alt. tot. testae 7'2, 

 axis 3'2, diam. diag. ajjert. cum perist. 6 mm. 



"Operculum orbiculare, supra lamellis spiralibus exstantibus, 

 distincte denticulatis, compositum, infra lasvigatum, volutionibus 

 augustis spiralibus concentrice minute striatis. 



"Animal fere uniforme atrura, corpora supra, tentaculis ad 

 terminationem et pede lateraliter ad marginem inferiorem paulo 

 ])alidoribus ; forma ab ceteris speciebus ejusdem generis baud 

 distincta." (StoliczJca.) 



Hah. Burma: Kuengan near Moulmain {Iheohald). 



The outer lip is at the suture produced into a narrow obtuse 

 wing, curved towards and loosely attached to the previous whorl, 

 leaving a rounded circular foramen behind it. The whoi'ls of the 

 operculum are peculiarly dentate above, 



140. Pterocyclus bifrons, Pfeiffer. 



Pteroci/clos bifrons, Pfeiffer, Proc. Zool. Soc. 1855, p. 1 1 7 ; id., Moii. 

 Pneum. Suppl. 1, 1858, p. .30; Reeve, Conch. Icon, xiv, 186.3. pi i, 

 iig. 1 ; Pfeiffer, op. cit. Suppl. 2, 1865, p. 42 ; II. Nevill, Emim. 

 flelic. Pneum. Ceylon, 1871, p. 5; Pfeitfer, op. cit. Suppl '3 

 1875, p. 53, p. 385; Theobald, Cat. Shells Brit. India, 1876, 

 p. .38 ; Ilanley vt Theobald, Conch. Ind. 1876, pi. 142, tigs. 8,9; 

 Jousseaume, Mem. Soc. Zool. France, vii, 1894, p. 301. 



Pferoci/cliis hifronSflSexiW, Hand List, i, 1878, ]>. 261 ; Kobelt & 

 Miiilcnddrff, Nadir. Dents. Malak. (les. xxix, 1897, p. 113; id., 

 Cat. Pneuiu. 1899, p. 25 ; Kobelt, Das Tierreich, Lief. 16, 1902^ 

 p. 162 ; id., Conch.-Cab., Cyclophoridae, ii, 1909, p. 723, pi. 104' 

 figs. 15, 16. 



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