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Show 2 0 each of the last with a dimorphic phase. Of these tlie South Cameroon race of Gorilla gorilla and the Gaboon White-faced Chimpanzee were described as new. In illustration of the paper Mr. Rothschild exhibited seven stuffed Gorillas, eight stuffed Chimpanzees, twenty-six skulls of Gorillas, two skulls of Chimpanzees, two entire skeletons of Gorillas, some casts of a Gorilla and Gorilla skulls, a number of photographs and drawings of Chimpanzees, and two drawings of Orang-Utans. The bulk of the mounted specimens, all but three Gorillas and two Chimpanzees, were mounted under Mr. Rothschild's personal supervision, from photographs and sketches from life, by Rowland Ward ; the five exceptions were set up by Gerrard. Dr. W . G . R id ew o o d , F.Z.S., read a paper on the Cranial Osteology of the Clupeoid Fishes, a sequel to two papers dealing with the skull in the Elopoid and Mormyroid Fishes which had already been published. The skulls of Chanos, Chirocentrus, Chatoessus, Clupea, and seven other genera were described in greater or less detail, and in a Summary the relative values of such " Clupeoid " characters as the temporal foramen, auditory fenestra, pre-epiotic fossa, pro otic and squamosal bullfe, and posterior wings of the parasphenoid bone were discussed. Dr. Kidewood arrived at the conclusion that Chanos had no close affinity with the Clupeidse; and he pointed out that the skull of Chirocentrus so closely resembled that of the Clupeidfe that it was only the strongly marked differences to be found in other parts of the body which justified the retention of the Chirocentridse as a family distinct from the Clupeidas. Professor E. A. M in c h in , F.Z.S., read a paper on the characters and synonymy of the British species of Sponges of the genus Leucosolenia, based on examination of the type specimens in the British Museum and elsewhere. Three species were recognised, namely :-L. botryoides (Ell. & Sol.), synonyms Ascandra botrys Hseckel and A. nitida H. ; L. complicata (Mont.), synonyms Ascandra pinus H., Ascortis fabricii H., Asculmis armata H., and possibly Ascyssa acufera H .; and L. variabilis H., synonyms Ascortis corallorrhiza H., Ascandra tenuis Schuffner, and Leuconia somesii Bowerbank. The paper aimed at giving an exhaustive account of the characters and variations of the three species. Dr. W. P. B lan fo r d , C.I.E., F.R.S., read a paper containing descriptions of 18 species of Land-Mollusca belonging to the genus Macrociilamys and its allies. All were from the British Indian Empire, and about half were collected by the describer 5 some were from Colonel Beddome's or other collections. Of the species described, twelve were referred to Macrochlamys, one to Taphrospira (nov. gen., type Helix convallata Benson), one to Bensonia, one to Polita, two to Microcystina, and one to Euplecta. |