524 " THETIS " SCIENTIFIC RESULTS. 



fewer joints ; the latter also appear to be rougher on the dorsal' 

 side. It differs from hidens, moreover, in the complete absence 

 of the tubercles on the costals and lov/er brachials, in having a 

 syzygy in the sixth or seventh brachial (though this is of little 

 importance), and in somewhat different lower pinnules. Un- 

 fortunately, there is some uncertainty about the pinnules of 

 bide^is, as described by BelF ; he says the first one has " some 

 twelve joints," with " the most proximal joint the longest," 

 while the figure given shows fourteen joints, the third and fourth 

 decidedly the longest. In view of our imperfect view of adeonce, 

 and the obvious resemblance between that species and both 

 hidens and thetidis, it seems to me quite possible that more abun- 

 dant material will show that the three names belong to a single 

 species. 



HIMEROMETRA P^DOPHORA," sp.nov. 

 (Plate xlvii., figs. 4-10.) 



Centro-dorsal small, discoidal, can ying only a single series of cirri, 

 of which there are only ten-fifteen ; tliese (PI. xlvii., fig. 10) are 

 about 10 mm. long, with twenty-five-thirty-five (usually twenty- 

 eight-thirty) joints ; first four basal joints wider than long, but all 

 succeeding joints about as long as wide ; joints all smooth or 

 nearly so, until near tip of cirrus, wliere a slight longitudinal 

 keel is barely developed on dorsal side of each joint ; in some 

 cases this keel gives I'ise to a slight spine, but even on penultimate 

 joint no conspicuous spine is found ; terminal claw short and 

 blunt. Radials barely visible ; costals not at all swollen or 

 peculiar in any way ; first costals much wider than long, narrower 

 proximally than distally, perfectly smooth, and distinctly 

 separated from each other; costal axillaries smooth, much wider 

 than long, with lateral edges veiy short, and distal edges slightly 

 concave. Ten arms, 17-19 mm. long; first brachials wider than 

 long, outer edge somewhat longer than inner, which touch each 

 other at least proximally ; second brachials similar, but distal 

 margin not so straight; third and fourth brachials equal, dis- 

 coidal, united by syzygy, the two together about as long as wide ;. 

 succeeding joints more or less oblong, the outer and inner sides 

 usually slightly differing in length. Syzygia occur between the 

 third and fourth, seventh and eighth, eleventh and twelfth 



5"Bell— Zool. Rep. "Alert" 1884, p. 158, pl.xi., fig. A b. See alsoDoder- 

 lein, 1898, in Semon's Zool. Forch. Austr. v., 4, p. 476, pi. xxxvi., figs.3-3(i. 



'^ 7r«ts=child 4- (popeco=to carry, in reference to the carrying of the penta- 

 crinoid larvaj, on the pinnules. 



