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

;264 COLLECTIONS FROM MELANESIA.6. Pagurus imbricatus, M.-Edtv.A specimen which I believe to be an adult male is referred herefrom Thursday Island, 3-4 fms. (No. 145), an adult female from thesame locality and depth (No. 175), and a smaller male from Prince ofWales Channel, 9 fms. (No. 157).Specimens also are in the British-Museum collection from SharkBay, W. Australia {Bcajner, H.M.S. Herald '').The smaller examples agree very well with Milne-Edwards's briefdescription*. As, however, the animal increases in size, smallgranules or prominences are developed upon the anterior margins ofthe flattened tubercles or scales of the outer surface of the leftchelipede, which in the male from I'hursday Island are large enoughto give it a uniformly granulated appearance.7. Pagurus hessii. (Plate XXVIII. fig. A.)Carapace depressed, with a few hairs on the sides near the front,the cervical suture distinctly defined; the branchial regions butmoderately dilated on the sides ; with no m.edian rostral tooth, butwith the lateral frontal teeth (situated just outside of the bases ofthe eye-peduncles) triangulate and subacute; lateral margins withoutspines. Ophthalmic segment, between the eyes, completelyuncovered. Terminal postabdominal segment divided by a mediannotch into two unequal rounded lobes. Eye-peduncles robust, inthe adult shorter than the width of the front, with the cornesBconsiderably dilated ; tlieir basal scales with a rounded lobe on theirouter margins, and with their apices subtruncated and armed withtwo or three spinules. The peduncles of the anteunules in the adultscarcely reach to the end of the eye-peduncles ; the antepenultimateand penultimate joints of the peduncles of the antenn£e each bear asmall spinu.le above, besides the longer acicidum which projects fromthe dorsal surface of the penultimate joint, which has one or twosmaller spinules on its inner margin; the joints of the antennalflagella are almost naked. The coxae of the outer maxillipedes andchelipedes are almost contiguous. The chelipedes are nearly equaland of moderate size ; the merus-joints trigonous, the margins (inthe adult) armed with a few spinules toward the distal extremityupper and outer surface of the wrists scantily hairy and spinulose,the spinules arranged in three longitudinal series; palms ratherturgid, about as long as the fingers, spinulose and hairy, the spinulessmaller and more crowded below, larger and more distinctly longitudinallyseriate on the upper and outer margins ; fingers spinuloseand hairy, with subexcavate dark corneous tips, and opening somewhatobliquely. The last three joints of the first and second ambulatorj'legsare hairy and spinulose above; the terminal joints slender,longer than the preceding, and externally longitudinally caualiculatedon the inner surface, bearing a series of oblique sulci which arebordered with hairs. Both the fourth and fifth legs are chelate* Ann. Fci. Nat. ser. 3, Zool. x. p. 61 (1848).