HELIX-OBBA. 219 



peristome broadly expanded, white, basal margin reflexed, toothed 

 more or less obviously in the middle. Umbilicus deep, cylindrical, 

 about one-ninth the diameter of the shell. 



Alt. 12, greater diam. 41, lesser diam. 31 mill. 

 " 14, " " 34, " " 28i " 



" 11, " " 26, " " 21 " 



8, " " 24, " " 19* " 



Southern Luzon (Province of Albay), and the adjacent islands 

 Visayas, Lugbon, Calaquas, Marinduque; Gorontalo, northern Cele- 

 bes (a small form.) 



Carocolla Listeri GRAY, Ann. of Philos. xxv, (new ser. vol. ix) 

 1825, p. 412 (no description). REEVE, Conch. Syst. ii, 1. 168, f. 11, 

 12. H. listeri PFR. Monogr. Hel. Viv. i, p. 402 ; Kuster's Conchyl. 

 Cab., p. 208, t. 105, f. 9-15. HIDALGO, Journ. de Conchyl. 1887, 

 p. 103. MARTENS, Mai. Bl. 1872, p. 170. Helix listeriana WOOD. 

 Obbina listeri Gray, SEMPER, Reisen im Archip. Phil., Landmoll., 

 ii, p. 125, with var. costata. H. planulata (part) REEVE, Conch. 

 Icon., f. 122 c, d. H. auriculata SWAINSON, Zool. Illustr. i, t. 9, 1820 

 (not Polygyra auriculata Say.) 



The northernmost point recorded for this species is Palanan, far up 

 the east coast of Luzon. 



It is a very variable shell, but may be recognized by the peculiarly 

 mottled or spotted coloration and acutely keeled periphery. 



Var. AURICULATA Swains. A form collected on the island of Mar- 

 induque by M. Quadras is similar to the figures of " H. auriculata " 

 given by Swainson, forming a passage to the H. planulata. The 

 periphery is rounded. (See Hidalgo, I. c.) 



Var. COSTATA Semper. Number of whorls, form of the mouth and 

 the two brown bands as in the typical listeri ; but differing in the 

 flatter upper surface, distinct ribs above and below, the keel flaring 

 upward, so that the upper surface of the last whorl is concave to- 

 ward the keel. Ground-color brown above, the ribs whitish ; yellow- 

 ish beneath. Surface not malleated, but coarsely granulated be- 

 tween the ribs. 



Camiquin de Luzon ; Cabayat, Northern Luzon. 



H. GALLINULA Pfeiffer. PI. 57, figs. 88, 89, 90. 



Shell umbilicated, lens-shaped, rather strong, rather smooth, some- 

 times with irregular malleations ; yellowish-gray, with a few narrow 

 brownish-red bands, over which it is clothed with an epidermis hav- 



