AMPHIDROMUS, GROUP VI. 11 



in southern Cambodia near the Ha-tien frontier; Tram-Klma betw. 

 Kampot and Pnom-Penh ; Kebal-Khmoch, Kassan-Pno (Pavie). 

 Cochin China (Morelet). Siam : environs of Battambang (Pavie). 



Bulimus comes PFR., P. Z. S. 1861, p. 193 ; Novit. Conch. p^Sll, 

 pi. 75, f. 10, 11 ; Monogr. vi, p. 19 MARTENS, Ostas. Landschn., 

 p. 78 Amphidromus comes Pfr., MORELET, Journ. de Conchyl. 



1889, p. 126 FULTON, Ann. Mag. N. H. (6), xvii, p. 72 



FISCHER, Bull. Soc. d'Hist. Nat. d'Autun, iv, 1891, p. 115 

 Cochlostyla comes SCHAUFUS in Paetel's Catal., p. 78. B. perversus 

 var. comes, MORELET, Ser. Conch, iv, p. 258. 



? Bulimus virescens SWAINSON, Catal. of the rare and valuable 

 Shells which formed the celebrated collection of the late Mrs. Bligh, 

 Appendix, p. 13 (1822) ; Exotic Conchology (edit. 2), p. 37. 

 Bulimus citrinus var., SWAINSON, Zool. Illustr. iii, pi. 166, f. 1, 2, 

 3 (1822-3). 



The typical form of comes (well named the companion, for its 

 intimate relations with several other species) is slightly perforate, with 

 recurved but not adnate lip, peculiarly blended greenish and yellow 

 coloring on the later whorls, or wanting the green ; the flesh tint of 

 the spire arrested by a wide but not distinctly defined yellow varix 

 on the next to the last whorl, with a wide stripe of the same behind 

 the outer lip. There is no white zone below the suture, such as 

 marks various forms of A. aureus. Pfeiffer's description is given 

 above, supplemented with bracketed notes on the series of specimens 

 before me. 



PL 57, figs. 1, 2, are from Pfeiffer ; fig. 3 is a specimen from 

 Cochin China (from Morelet) ; fig. 5 is a dextral shell from Siam, 

 and fig. 4 a yellow individual from Cambodia. 



I have not much doubt that Swainson's Bulimus virescens was 

 a specimen of comes, but until all doubt is removed, it will be better 

 to retain the well established name. 



Subsp. POLYMORPHUS (Tapparone-Canefri), PI. 57, figs. 6-10. 



Shell either dextral or sinistral, usually im perforate and larger 

 than comes, solid and strong ; greenish-yellow, with reddish brown, 

 flames on the spire, changing on the last whorl to greenish or brownish- 

 green stripes which do not quite reach the suture above, or becoming 

 merged in a general dusky greenish-yellow color ; almost always 

 with a pale streak behind the outer Up ; one or two black-brown varice 



