20 THE VOYAGE OF H.M.S. CHALLENGEK. 



Milne-Edwards and Heller, the chief characteristic being the rounded lobe on the outer 

 border of the meral joint. 



The chelipedes are of moderate length, and pubescent towards their termination ; the 

 meral joint is trigonal, and each of the three borders is armed with a row of acute 

 spiuules, those on the inner border being of very small size ; the carpus is about half the 

 length of the propodus, and bears several spinules on its outer surface and upper border. 

 The propodus is without spines, the fingers also are unarmed, each presents a thin 

 cutting edge, and is slightly bent inwards. The three anterior pairs of ambulatory limbs 

 are moderately long, compressed, and pubescent, the second and third pairs subequal in 

 length, the merus is longitudinally canaliculate above, and its anterior border is armed 

 with from three to five acute curved spinules, a few of smaller size existing on the 

 posterior border ; the propodus is canaliculate both above and below, and its posterior 

 border, as well as that of the dactylus, is armed with a series of horny spines which are more 

 numerous and shorter on the latter joint ; the dactylus is also grooved on both surfaces, 

 and its tip is acute and slightly recurved. The ultimate pair of legs are subdorsal and have 

 the dactyli and propodi greatly reduced in size ; the merus bears a single spine on its 

 anterior and distal border, while the posterior border possesses three of larger size ; the 

 short curved dactylus is opposed to the propodus, which is likewise bent, and the latter 

 is armed with several long and delicate spines. 



The seven abdominal segments in the female are, with the exception of the first three, 

 broad and unarmed, but slightly pubescent ; the second bears a pointed tubercle, and a 

 rounded elevation is present on the third ; the seventh has the apex acuminate. Five 

 pairs of abdominal appendages are present, the first pair rudimentary. 



Breadth of carapace 13 '5 mm., length of carapace 17 mm., of second ambulatory leg 

 41 mm., of fourth ambulatory leg 23 mm., of chelipede 24*3 mm. 



The above description and measurements are taken from the Zebu specimen (a 

 female). The Ki specimen {a male) is in a very imperfect condition, only the proximal 

 joints of the limbs being present ; it differs, moreover, in having no pubescence on the 

 carapace or abdomen. 



Habitat. — Station 192, ofi" Little Ki Island; depth, 140 fathoms; bottom, blue mud. 



Station 209, off Zebu, Philippine Islands ; depth, 95 fathoms ; bottom, blue mud. 



Genus Homologenus, A. Milne-Edwards. 

 Homolopsis,^ A. Milne-Edwards, Bull. Mus. Comp. Zool., vol. viii. No. 1, p. 34, 1880. 

 " This genus differs from Homola in the more rounded and more ovoid form of 

 the carapace, in the great development of the rostrum, in the form of the eyes, 

 which are very small and not narrowed at their base, and in the feebleness of the legs." 



• The name Hmiwlopsis being preoccupied in Zoology, Professor Milne-Edwards has suggested, in a letter to the 

 writer, that given above. 



