HYDATINA. 387 



H. PHYSIS Linne\ PI. 45, figs. 14, 15, 16, 17. 



Shell large, globose or oval, thin ; under a thin buff cuticle the 

 shell is white, with many close wavy brown spiral lines. Surface 

 very slightly and coarsely waved longitudinally, otherwise smooth. 

 Vertex flat, the spire about level ; whorls about 3, the first a min- 

 ute globose, uptilted and half immersed nucleus, the rest separated 

 by deep sutures. Body-whorl globose above, somewhat attenuated 

 below, where there is a convex spiral rib surrounding the umbilical 

 tract; aperture about as long as the shell, large, ovate, narrower 

 and curved above, dilated below. Lip simple and thin, very little 

 retracted toward its upper insertion, rounded at base, bluntly 

 angled at foot of the columella. Columella gently concave or 

 nearly straight, with reflexed edge, leaving an umbilical chink or 

 rarely none. 



Alt. 32, diam. 29 mill., often larger. 



Alt. 29, diam. 20 mill., slender specimen. 



Natal (Krauss) ; Mozambique and Imhambane (Peters) ; Mauri- 

 tius (Q. & G., Kobillard, et al.) ; Rodriguez (Robillard) ; Reunion 

 (Desh.) ; Seychelles and Amirantes (Dufo) ; Red Sea (Ehrenb., 

 Cooke) ; Philippines (Martens) ; Manila; Jeddo, Japan (Lischke)-; 

 Port Jackson, Botany Bay and Moreton Bay, Australia (Angas) ; 

 Sandwich Is. (Newcomb) ; Cuba (Orbigny) ; Guadeloupe (Beau) ; 

 St. Thomas (Swift) ; St. Vincent Island, West Africa (Geisse). 



Bullaphysis LINN., Syst. Nat. x, p. 727. A. AD., Thes. p. 565, 

 pi. 120, f. 9-11. QUOY & GAIM., Astrol. p. 363, pi. 26, f. 1-3 (an- 

 imal). KRAUSS, Die Siidafrik. Moll. p. 70. Hydatina physis 

 SOWB., Conch. Icon. f. 2. DKR., Ind. Moll. Mar. Jap. p. 162. 

 MARTENS, Mobius' Reise p. 304 ; Monatsber. K. Akad. Wissensch. 

 Berl. 1879, p. 738. MKE., Mai. Bl. i, p. 41. MORCH, Mai. Bl. 

 xxii, p. 175. COOKE, Ann. Mag. N. H. (5), xvii, p. 128. 

 LISCHKE, Jap. Meeres-Conch. i, p. 114. ANGAS, P. Z. S. 1867, p. 

 225. Hydatina filosa SCHUM., Essai d'un Nouv. Syst. p. 186. Bui- 

 la virgata MARTYN, Univ. Conch, pi. 11. Bulla atrolineata 

 SCHROETER, Wiedemann's Archiv fiir Zool. u. Zoot. iv, p. 16. 

 Bulla quoyana ORB., Moll. Cuba, p. 131. Bulla (Hydatina) stami- 

 nea MKE., Zeitschr. f. Mai. 1853, p. 136 ; Mai. Bl. i, p. 41 (narrow 

 form.) 



Readily known by the numerous spiral lines. This species has 

 an extremely wide range, surpassing, probably, any other Tecti- 



