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Show 1870.] MR. W. HARPER PEASE ON THE GENUS TRIPHORIS. 773 B. Pectoral fins low down on the sides of the body, narrow and elongate ; second and third fingers very long, of nine or ten phalanges ; head swollen, subglobular. Globiocephalidae : Grampus, Globiocephalus, Sphcerocephalus. II. Pectoral fin short, broad, rounded or truncated at the end, shorter than the arm-bones ; second finger rather the longest, the rest gradually shorter, second finger with six or eight phalanges. 1. Orcadse: Orca, Ophesia. 2. Belugidae : Beluga, Monodon. 3. Pontoporiidse: Pontoporia. 5. Remarks on the Genus Triphoris (Desh.), with Descriptions of new Species. By W . H A R P E R P E A S E , C.M.Z.S. Eighty-eight species of the above genus are known (including the following),distributed as follows:-East Indies and Polynesia, seventy-three; Australia,six; Panama,one; West Indies,four ; Mediterranean, two ; localities unknown, two. Of the species described by M . Deshayes inhabiting the island of Bourbon, two are synonyms of Polynesian species ; two of those described by Prof. Adams from Panama are synonymous, and the remaining one a Cerithiopsis *. I also exclude several described under the above genus, which prove to belong to Bittium. Mr. Hinds having collected a large number of species during the voyage of the 'Sulphur,' classified them according to shape. A more natural and certainly more distinct arrangement would be according to sculpture, with which the disposition of colours also agrees. Of one section, the species are encircled by two or three rows of granules or beads, and the colours regularly disposed ; the other, those which are smoothly keeled, colours mottled. Colours in this genus, and their arrangement, are constant, and may be relied on as a specific guide. With few exceptions, the specimens from which the descriptions heretofore published have been drawn up were imperfect or immature. In consequence, probably, of greater advantages in collecting, I have obtained perfect specimens of thirty-six species, and of a large number in all stages of growth. The spire becomes developed early ;md remains constant; the last whorl and outer lip pass through several stages of growth. The young are planulate at base, the shell of a pyramidal form ; as the last whorl is developed and assumes its normal form, the outer lip unites at base with the whorl and is produced in the shape of a tubular canal ; posteriorly a perforation is formed at its junction with the body-whorl, though frequently only a broad sinus is left. The edges of the perforation are generally slightly everted ; and on four species only, so far as I am aware, it is produced in tubular shape, similar to the basal canal, viz. T. mira- * Teste Carpenter, P. Z. S. 1863, p. 350. |
