264 COLLECTrONS PEOM MELANESIA. 



6. Pagurus imbricatus, M.-Edw. 



A specimen which I believe to be an adult male is referred here 

 from Thursday Island, 3^fms. (No. 145), an adult female from the 

 same locality and depth (No. 175), and a smaller male from Prince of 

 "Wales Channel, 9 fms. (No. 157). 



Specimens also are in the British-Museum collection from Shark 

 Bay, W. Australia {Rayner, H.M.S. 'Herald'). 



The smaller examples agree very well with Milne-Edwards's brief 

 description*. As, however, the animal increases in size, small 

 granules or prominences are developed upon the anterior margins of 

 the flattened tubercles or scales of the outer surface of the left 

 chelipede, which in the male from Thursday Island are large enough 

 to give it a uniformly granulated appearance. 



7. Pagurus hessii. (Piaie XXVIII. fig. A.) 



Carapace depressed, with a few hairs on the sides near the front, 

 the cervical suture distinctly defined; the branchial regions but 

 moderately dilated on the sides ; with no median rostral tooth, but 

 with the lateral frontal teeth (situated just outside of the bases of 

 the eye-peduncPes) triangulate and subacute ; lateral margins with- 

 out spines. Ophthalmic segment, between the eyes, completely 

 uncovered. Terminal postabdominal segment divided by a median 

 notch into two unequal rounded lobes. Eye-peduncles robust, in 

 the adult shorter than the width of the front, with the corner 

 considerably dilated ; their basal scales with a rounded lobe on their 

 outer margins, and with their apices subtruncated and armed with 

 two or three spinules. The peduncles of the antennules in the adult 

 scarcely reach to the end of the eye-peduncles ; the antepenultimate 

 and penultimate joints of the peduncles of the antennae each bear a 

 small spinule above, besides the longer aciculum which projects from 

 the dorsal surface of the penultimate joint, which has one or two 

 smaller spinules on its inner margin; the joints of the antenna! 

 flageUa are almost naked. The coxse of the outer maxillipedes and 

 chelipedes are almost contiguous. The chelipedes are nearly equal 

 and of moderate size ; the merus-joints trigonous, the margins (in 

 the 'adult) armed with a few spinules toward the distal extremity ; 

 upper and outer surface of the wrists scantily hairy and spinulose, 

 the spinules arranged in three longitudinal series; palms rather 

 turgid, about as long as the fingers, spinulose and hairy, the spinules 

 smaller and more crowded below, larger and more distinctly longi- 

 tudinally seriate on the upper and outer margins ; fingers spinulose 

 and hairy, with subexcavate dark corneous tips, and opening some- 

 what obliquely. The last three joints of the first and second ambu- 

 latory legs are hairy and spinulose above ; the terminal joints slender, 

 longer than the preceding, and externally longitudinally oanaliculated 

 on the inner surface, bearing a series of oblique sulci which are 

 bordered with hairs. Both the fourth and fifth legs are chelate • 



* Ann. Fci. Nat. adr. 3, Zool. x. p. 61 (1848). 



