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Show 1881.] PROF. F. J. BELL O N A N E W SPECIES OF MESPILIA. 433 PSEUDOBOLETIA INDIANA. Absolute diameter, in millim. 70 53 52 Percentage value of Height. 45-7 474 49-4 Actinostome. 42-1 42-4 40 Abactinal area. 16-4 15 12-3 Anal area. 7-1 ECHINOSTREPHUS. For the present it is not possible to do more than give the accompanying table of measurements ; when any change is made in the position of this curious genus, it should be based on a fuller knowledge of its life-history than we at present possess. In the meantime, in its unusual form it stands alone, not only among the Echinometridse, but among all the Echinidse. The smallest specimen measured (which is also smaller than any measured by Prof. Alex. Agassiz) would seem to show that there is, during the rather earlier stages, a considerable diminution in the proportional values of the abactinal and actinal areas. ECHINOSTREPHUS MOLARE. Absolute diameter, in millim. 145 25 265 Percentage value of Height. 48-2 54 49 Actinostome. 44-8 38 32 Abactinal area. 27-5 23 22-6 Anal area. 13-5 10 2. Description of a New Species of the Genus Mespilia. By ¥. JEFFREY BELL, M.A., F.Z.S. [Received February 24, 1881.] When, last year, I was engaged in naming and revising the specimens of Temnopleuridse in the British Museum, I was unable to satisfy myself as to the exact specific nature of the specimen now to be described, and which I propose to name after its discoverer. MESPILIA WHITJVLEI, n. sp. The examination of this species revives nearly all the difficulties as to the definition of the genera Mespilia and AmBlypneustes. The |