85 
repetition of that which has already been published in our Transac- 
tions in reference to the Semnopithecus Entellus*. The form and size 
of the cecum, and the length and disposition of the intestinal canal 
in the Colobus equally corresponded with those parts of the anatomy 
of the closely allied genus Semnopithecus.” 
Mr. Waterhouse observed, that the animal dissected by Prof. Owen 
had been presented to the Society by the Earl of Derby, and had 
lived for some time in the Menagerie. Soon after its death he had 
carefully examined it with a view to ascertain whether it possessed 
cheek-pouches. Of these he found not the slightest trace. 
Mr. Lovell Reeve then read his ‘‘ Description of a new species of 
Corbis, a genus of acephalous mollusks of the family Nymphacea.” 
Corsis Soversi. Cord. testd transversd, tumidd, gibbosd, lacted 
aut rubelld ; radiis roseis obsoletis ab umbonibus ad marginem di- 
vergentibus ; lamellis transversis elevatis, remotiusculis, utrinque 
serratis, anticé valdiis ; striis numerosis radiantibus, intra lamel- 
las ; margine subcrasso, profunde crenulato ; umbonibus longitudi- 
nalibus, minutis, opposite incurvis ; lunuld parvd, subcordatd, 
Long. 23; lat. 34 poll. Mus. Stainforth, Norris. 
Junior, testa depressiusculd, radiis roseis longitudinalibus plus mi- 
nusve distinctis. 
Long. 12; lat. 1% poll. Mus. Stainforth. 
Hab. ad insulam Negros, Philippinarum. 
Found in loose coral sand on the reefs at low water. 
“«T have much pleasure in dedicating this beautiful species of Cor- 
bis, figures of which will appear in the third part of my ‘ Concho- 
logia Systematica’ (pl. lviii.), to that industrious author and artist 
Mr. G. B. Sowerby, jun. Only one recent species of this character- 
istic genus of Nymphacea has been hitherto known; it is therefore 
gratifying to be able to make so valuable an addition. The Corbis 
Soverbii differs materially from the Corbis fimbriata: instead of the 
closely fimbriated character of the outer surface, the valves are crossed 
transversely with distinct elevated lamellar ridges, between which 
there are numerous striz running in a longitudinal direction. It is 
also characterized by being strongly tinged with pink, particularly 
in an early stage of growth, when the valves are vividly painted with 
deep-coloured rays passing from the umbones to the margin : as the 
shell increases in age it increases in convexity, the lamelle become 
thickened, and the rays obsolete. This interesting species more 
nearly resembles the Corbis lamellosa of Lamarck, known only in a 
fossil state; it differs, however, in having the valves much more 
gibbous or ventricose, and in the lamelle being strongly serrated on 
the anterior side. Some little time since I was fortunate enough to 
obtain, at a public auction at Rotterdam, four specimens of the 
C. Soverbii, two in the young and two in the adult state. The sale 
consisted of a valuable collection of shells, formed with considerable 
* Vol. i. p. 65. pl. 8. 
