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Show 704 MR. W. T. CALMAN ON MACRUROUS [May 16, EXPLANATION OF PLATE XXXVIII. Fig. 1. Limnothelphusa maculata, gen. et sp. nov. (p. 698). Adult male, general view from above. X 2^ about. 2. Ventral view of the anterior portion, to show the relations of buccal frame, epistome, antennules, and antennae. 3. Ventral view of posterior portion of thorax, abdomen removed, showing abdominal appendages and male genital papillae. 4. External maxilliped. 5. Dactylus of walking-leg, to show the nature of the spinules. 6. Terminal portion of cheliped, showing nature of dentation. 7. Male abdomen, primitive dorsal view. Figures 2-7 considerably enlarged. Reference Letters. a.y. Genital aperture. ep. Epistome. f.b. Buccal frame. t.so. Sub-ocular tooth. 3. O n two Species of Macrurous Crustaceans from Lake Tanganyika. By W . T. C A L M A N , B . S C , University College, Dundee.1 [Eeceived April 29, 1899.] (Plates XXXIX. & XL.) The Crustaceans collected in Lake Tanganyika by Mr. J. E. S. Moore and placed in my hands for examination comprise specimens of two species of Prawns, one forming the type of a new genus allied to Caridina, the other being a probably new species of Palcemon. Sub-order MACBJJBA. Tribe CAEIDEA. Family ATYIDCE. LIMNOCARIDINA, gen. nov. Rostrum long, compressed, serrated. Carapace with a hepatic spine. Perseopods without exopods. Carpal joint of first pair slightly excavated distally, that of second pair not excavated. No epipods on any of the thoracic appendages. Grills four in number on each side, corresponding to the first four pairs of peraeopods. LIMNOCARIDINA TANGANYIKCE, sp. n. (Plates XXXIX. & XL. figs. 1-2, 4-19). Description.-The rostrum (Pl. X X X I X . figs. 1-2) is very long aud slender, gently recurved, varying from about lg to twice the length of the carapace, and extending beyond the antennal scale by 3 to nearly \ its length. There are from 12-15 teeth on its 1 Communicated by Prof. G. B. H O W E S , F.Z.S. |