FROM THE INLAND SEA OF JAPAN. 397 



The legs are yellowish, the carapace ovange-coloured. 



Geographical Distribtitiou. — Japan [de Haan) ; Bay of Tokyo, Kaclsiyama, Kagoshima, 

 Japan ( Ortmann) ; Gulf of Martaban {Henderson) ; Andamans (Alcock). 



LEUCOSIA, Eabr. 



Leucosia rhomboidalis, de Haan. (PI. 31. fig. 7.) 



Leucosia rhomhoidalis, de Haan, Fauna Japonica, Crust. 1841, p. 134, pi. 33, fig. 5; Alcock, iu Journ. 

 Asiat. Soc. Bengal, vol. Ixv. pt. ii. 1896, p. 234. 



One adult male from the Inland Sea of Japan, caught in deep water. 



The carajiace is 16 mm. long and 13'75 mm. broad ; its upper surface is lead- or slate- 

 coloured, without the dark red spots described by Alcock. The abdomen (PL 31. fig. 7) 

 does not exactly agree with the figure in the ' Pauna Japonica ' ; the penultimate segment 

 narrows more distinctly distally and its lateral margins are very slightly arched, not at 

 all concave ; the antepenultimate joint is distinctly constricted not far from its posterior 

 margin, as in Leiic. maculata, Stimps., which is regarded by Alcock as identical with 

 this species. The edge of the pterygostomian region that forms the anterior boundary 

 of the thoracic sinus is quite straight. 



MYEA, Leach. 



Myra fugas (Pabr.). 

 Myrafugax (Fabr.), Alcock, in Journ. Asiat. Soc. Bengal, vol. Ixv. pt. ii. 1896, p. 202. 



One young male from the Inland Sea of Japan, deep water. 



The carapace of this specimen, which agrees with the form described by Miers in 1879 

 under the name of Myra duhia, and apparently also with that described by Hilgendorf 

 as Myra coalita, is 13"5 mm. long exclusive of the median spine, and 15 mm. w'hen it is 

 included ; the carapace is 12-4 mm. broad. The upper surface, which is strongly convex 

 transversely, agrees in its general shape with the figure of 3Iyra carinata in Bell's 

 Monograph, but the acute median spine is much shorter, being only once and a half as 

 long as the lateral ones. The median granulated ridge is quite distinct, as also the raised 

 cluster of granules on the well-defined intestinal region; punctiform granules are 

 scattered on the upper surface, except quite anteriorly. The front and the adjacent 

 parts of the flattened subhepatic regions are pubescent. Immediately behind the notch 

 three or four beads of the lateral border are dentiform, and one observes another just 

 above the last pair of legs. The chelipeds are 25 or 20 mm. long, not quite twice as long 

 as the cephalothorax. 



There is still a vei*y young male specimen, without definite locality, that no doubt 

 belongs also to this species ; it is, in my opinion, that form which has been described by 

 Dr. Alcock as a distinct species, Myra pentacaiitha (Alcock, I. c. p. 201). Measured in 

 the middle line, the carapace appears to be 61 mm. long the median spine included, and 

 5-5 mm. withovit it; it is 51 mm. broad. The carapace is less strongly convex; not 

 only is the intestinal region distinctly defined, but the branchio-cardiac grooves are also 



57* 



