1026 ON THE PYCNOGONIDA OF THE AUSTRALIAN COAST, 



its outer margin near the extremity ; the third very short : the last 

 four joints are small, armed with numerous simple spines. The 

 third pair of appendages are slendei", with seven joints, of which the 

 third is the longest, the fourth a little shorter and the rest small, 

 the terminal joint being the smallest of all ; none of them are 

 ornamented with compound spines. 



The fourth, fifth, sixth, and seventh pairs of appendages are 

 about four times the length of the body, comparatively stout, 

 ornamented with tubercles and numerous compound spines. The 

 first joint is small and has only one or two simple spines ; the 

 second joint is more than twice as long as the first, narrow 

 proximally, broader distally, with a very prominent tubercle and 

 several spines, one very large ; the third joint is smaller than the 

 second ; it is ornamented at its distal end with a few small, finely 

 ciliated spines ; the fourth joint is very long, four times as long as 

 the third, and with three or four spiniferous tubercles ; the fifth 

 joint is nearly as long as the fourth and is ornamented along its 

 anterior border with about ten to fifteen very large compound 

 spines ; the sixth joint is nearly the same length as the fifth, but a 

 little narrower, and is ornamented with similar spines ; the eighth 

 joint is about four times as long as broad, bears on its inner 

 (" palmar ") border a row of about twenty slightly curved spines, of 

 which the proximal two or three are stouter than the others ; the 

 dorsal border is beset with seven or eight longer and somewhat 

 more delicate spines, each set in a little tubercle ; the extremity has 

 likewise a few slender spines ; the claw is slightly shorter than the 

 eighth joint, stout, nearly straight. 



I obtained one specimen of this species in the dredge at Port 

 Molle in Queensland, at a depth of 15 fathoms during the cruise 

 of H. M.S. "Alert." 



Genus. AMMOTHEA. Leach. 

 Ammothea assimilis, n. sp. 

 [PI. LV., figs. 5-9.] 

 The body of this species is tolerably broad : tin; intersegmental 

 lines distinct. The lateral processes are in contact with one another. 



