Report on the zoological collections made in the Indo-Pacific Ocean ...

—ORTJSTiCEA. 263trigonous meriis-joint of the larger (left) chelipede is armed withthree or four spinules at its distal extremity : the carpus is butlittle shorter than the palm and granulated externally, the graimleson the upper margin increasing in size to the distal end, where theyare spinuliform : the palm also is externally granulated and pubescent; the lower margin is in a straight line with the lower marginof the immobile finger, and is armed with several much larger acutespinules; a few somewhat large granules exist also at the base of thepalm, and others are arranged in a longitudinal series along the outersurface parallel to the upper margin, and also along the upper marginof the palm and of the dactyl, which is about as long as the palm, flattenedexternally, and fitting closely against v|;he lower finger, havingon its inner margin near the base a rounded lobe, which is receivedinto a corresponding cavity in the inner margin of the lower finger.The smaller chelipede has the slender wrist and hand clothed withyellowish hairs ; the wrist armed above with small spinules arrangedin two longitudinal series. The second and third ambulatory legs areslender and thinly pubescent, with the dactyli arcuated and ratherlonger than the foregoing joints. The fourth and fifth legs are subchelate,the small dactyl impinging against the broad spongy padwhich terminates the penultimate joint. The filamentary appendagesof the postabdomen are clothed with long hairs. The left uropod onlyis perfect ; it has the inner ramus larger than the outer. The colouris whitish, with faint indications of pink upon the legs. Length ofthe carapace about 4 lines (nearly 9 millim.), of the left chelipedeabout 9 lines (19 millim.), of the third ambulatorj leg about 11 lines(23 miUim.).The single example in Dr. Coppinger's collection is from Princeof Wales Channel, 7 fms. (No. 169).This species scarcely differs from B. spinulimanus, Miers, except inthe longer slenderer rostrum, denticulated ophthalmic scales, and inhaving the lower margin of the immobile finger in a straight linewith the lower margin of the palm (fig. c), whereas in the typicalD. spimdimanus the lower finger is bent downward and the ophthalmicscales subeutire. In D. penicillatus the eyes are muchshorter, there is a median rostral spine, and the left chela has adouble series of spinules above.It may be distinguished from the species of Diogenes included inMr. Haswell's Australian Catalogue (pp. 156, 157) as follows :From D. miles, Fabr., by the much less spinulose chelipedes andshorter tarsi of the ambulatory logs ; from I), custos, Fabr., by thenarrower, non-denticulated, rostriform appendage ; from D. granulatus,Miers, by the very different form and armature of the larger(left) chelipede, &c. ; and from D. sencx, Heller, by the shorterrostrum and eye-peduncles, which latter do not reach to the end ofthe peduncles of the antenna), the different spinulation of the palmsof the chelipedes, &c.