149 



rounded with deep suture. Aperture, subcireular, angular (as usual) 

 above. Peritreme, slightly indented above. Umbilicus, large, greatest 

 breadth 0*27, least breadth 0'24. Umbilical keel, much raised on 

 the inside, and moderately so on the outside. Operculum, more con- 

 cave than the preceding ; sculpture partakes of that of C. corrugatus 

 and of C. Jamaicensis, the spiral lamina bending outwards, and its 

 margin slightly reflected horizontally, as in the former, and the plane 

 being strongly striated, as in the latter ; 7, or perhaps, 9 whorls, 

 convex on under side. Height 0'61, greatest breadth 0*88, least 

 breadth 072. 



C. dubiosus, Ad., and C. suturalis, Sow. See Cat. Phan. 

 p. 12. 



Habitat of C. dubiosus is north of " Holland Estate," near the 

 " Ys " river. It is very scarce ; and I never could obtain more 

 than one small lot, of about nine or ten specimens, many not fresh ; 

 and only one with the operculum, the spiral lamina of which is very 

 like in all respects to that of C. suturalis (see id., p. 12) ; but has 

 at least 7 whorls ; these in both shells bend outwards, like to my 

 type of C. corrugatus, with margins well reflected outwards, but 

 scarcely horizontally, though more so in C. dubiosus than in C. su- 

 turalis ; the under side of operculum is flat. C. suturalis is found 

 in the higher mountains which run from Manchester, as far as New 

 Hope, Westmoreland, in the west end of the island ; but not, I 

 think, near the spot where the former is found, though passing it. 



§11. 



C. varians, Ad. See Cat. Phan., p. 15, and ante, p. 145, as to 

 formation of lamina on operculum. Operculum, planulate on the 

 under side. Height 0*72, greatest breadth 0*9, least breadth 0*72. 



C. varians, var. a., Chitty. 



Is of a darker colour ; the operculum is slightly more concave ; 

 the last part of the last whorl is nearly smooth, devoid of sculpture ; 

 the umbilical keel is not so wide, and the shell is much less depressed 

 in proportion to its breadth. Height 0*72, greatest breadth 0*86, 

 least breadth 0-67. 



C. subrugosus, Sow. See Cat. Phan., p. 15. 



The description of operculum, wanting there, I am able to supply ; 

 Class varians, more planular, with 9 or 10, or perhaps more whorls 

 of the spiral lamina ; planulate below. 



C. corrugatior, Chitty. Gutter's Hill. 



Form, much depressed-turbinate. Colour, light red-brown, in- 

 clined to pink, with a light brown epidermis. Sculpture, fine 

 striae of growth on the 1st and 2nd whorls, except on the nu- 

 clear apex ; from about the completion of the 2nd whorl, the 

 diagonal (from right above to left below) corrugation becomes 

 very strongly and regularly defined, terminating, in regularity, 



