OCR Text |
Show 1 94 DR. W. T. CALMAN ON THE MACRUROUS [Mar. 6, one-sixth of length of fingers. Shape of fingers and setae as in L. retiarius, but the setae are shorter and are almost smooth, their barbs being extremely short and inconspicuous. Third pair of peraeopods reaching beyond tip of third maxillipeds, last pair distinctly shorter. Dactylus of third and fourth pairs (Plate X L fig. 12) less than half the length of the propodus, without spines, except the terminal one which is long and slender; that of fifth pair (Plate X L fig. 13) less than two-thirds of length of propodus, with a terminal and a short subterminal spine. Telson (Plate X L fig. 14) a little more than half as long as sixth abdominal somite. Outer plate of uropods a little longer than inner. Total length (ovigerous 2 ) 6'25-6'7 m m . Eggs "26 x '16 mm. Remarks.-This species, the smallest of the genus, is closely allied to the preceding by the structure of the chelae. It is strikingly distinguished, however, not only by the very short rostrum (which, in some specimens, may be even shorter than in that figured), but also by the very different armature of the dactylus in the posterior pairs of legs. Occurrence.-Kasawa, tow-netting, 8.30 p.m., 7.X.04. Many specimens. Only three ovigerous females. Kalambo, tow-netting, 8.20 p.m., 4.xi.04. Six specimens, including two ovigerous females. Karema, 12.xii.04. " tow-netting, surfa.ce, 8 30 p.m." Many specimens. LIMNOCARIDINA TANGANYIKA Caiman. Limnocaridina tanganyikce Caiman, Proc. Zool. Soc. 1899, p. 704, pis. xxxix. & xl. figs. 1-2, 4-19. I have very little to add to the account which I have already given of this species. Some of the specimens in the present collection are larger than any previously seen, reaching about 26 mm. in total length. The distal edge of the antennal scale reaches beyond the external spine. There is a single spine on the merus and another on the carpus of each of the last three pairs of legs. The sixth abdominal somite is about equal to the carapace, and its length two and a half times its depth. Occurrence.-Kasakalawe, 4.viii.04. "Taken in rock-pool about tide-mark." Two ovigerous females. Mtondwe Bay, 10.viii.04. " Swampy shallows." Seven specimens, four ovigerous. Mtondwe Bay, Niamkolo, 13.viii.04. "Taken in shrimp-net in a few feet of water." Kituta, 24.viii.04. " Enormous swarms were seen swimming close to the surface in about 10 feet of water on a calm afternoon. Colour uniform bluish-grey." Dr. Cunnington notes that these specimens differed much in colour and in general aspect from the other specimens of L. tanganyikce, and he suspected that they might be a distinct species, but I cannot find any noteworthy structural differences. |