43 



to consist of one piece which is armed as follows: Externally a coni- 

 cal projection near the hase with a long simple seta; outer apical lohe 

 (= the homologue of the second joint) with five setae, the second and 

 fourth of which are pectinate and longer than the rest ; the inner api- 

 cal lobe bears six (sometimes only five) setae , all but the innermost 

 being pectinate. The two lobes are separated by a simple rounded 

 incision and repeated examination of a number of individuals failed 

 to discover any signs of division or segmentation. The abdomen is 

 very slender , and , like the thorax , its segments are all ornamented 

 along the caudal margin with a row of teeth. Caudal stylet two and 

 a half times as long as wide , with one or two small spines externally 

 at a point one-third the length from the base and one longer spine 

 near the middle of the inner margin which is ciliate. The two median 

 apical setae are fused at the base and the inner is three times as long 

 as the outer, wich is twice as long as the stylet. The inner apical seta 

 is short, the outer obsolescent. 



In the male the antennae are reduced to a thick tumid member 

 with third and fourth segments greatly enlarged. The apical segment 

 is furnished with three hook -like claws. Flagellum slender and of 

 uniform width throughout. 



The fifth foot has on the outher apical lobe four setae and one 

 spinule and on the inner lobe three non-pectinate setae. Caudal sty- 

 lets greatly elongate, over four times as long as wide and nearly twice 

 as long as the preceding segment. 



'^Marshia brevicaudata n.j,^. 

 (Figures 12 — 15.) 



The second species of this genus at present known may be de- 

 scribed comparatively. Similar to M. alhuquerquensis in most respects 

 but differing at least in several obvious particulars. The caudal stylets 

 are short, about twice as long as broad, the longest seta being seven 

 times the length of the stylet Avhile the outer median is twice and a 

 half the length. The median setae are not fused at the base as in the 

 preceding species. 



In the male the proportions of the stylet are nearly the same as 

 in the female but the longest seta is nine times as long as the stylet. 

 The fifth foot of the female is nearly the same as in the preceding 

 species, but the proportions of the setae differ. The fifth feet of the 

 male closely resemble those of M. alhuquerquensis . The antennae of 

 the male differ. The flagellum is shorter and davate. The swimming 

 feet seem to be similar in the two species. Length of male, -56 mm;^. 



