FEOM THE GULF OF GUI^'EA. 93 



antennce short, stout, upper edge fringed witli long sctEe, 7-jointed, the second joint 

 shorter than, and having the upper distal angle produced so as to extend considerably 

 over, the next joint; the fourth joint is much shorter than either the preceding or 

 following joints ; the last joint is very small and hears two long terminal setae. In the 

 2-jointed secondary branches of the posterior antennse the distal joint is about twice 

 the length of the proximal one (fig. 38). The anterior foot-jaws are short and stout. The 

 small terminal joint of the posterior foot-jaws boars two long, stout, blunt-pointed spuaes, 

 ciliate on both edges, and a long, slender seta ; a long, plain seta springs from the end 

 of the first joint (fig. 10). The first four pairs of swimming-feet are nearly as in Bradya 

 typica ; the fifth pair are longer than broad, the apex of the second joint is obliquely 

 truncate and furnished with two setae, while the inner distal angle terminates in a stout 

 conical spine. Caudal stylets about once and a half the length of the last abdominal 

 segment. The imicr of the two principal tail-sette is about twice the length of the other ; 

 a small spiniform seta sjjrings from the outer margin and near the distal end of 

 each stylet. 



Habitat. In a surface tow-net gathering from a lagoon, Sao Thome Island, collected 

 January 21st. 



Subfamily T a c H i d 1 1 n .e, Boeck. 



Genus Euterpe, Claus. 

 'Euterpe, Clausj Die freilebenden Copepoden, 1803 ; Brady, Monog. Bi'it. Copep. 1880. 



Euterpe gracilis, Claus, var. armata, n. var. (PL XII. figs. 11-23.) 



Length '9 mm. Body as in Euterpe gracilis, but with the rostrum more pyramidal, 



slightly curved. Anterior antennse 7-jointed, shorter than the first body-segment. The 



proportional lengths of the joints as in the formula : — 



5. 10. 8. 9. 6. 5. 9 

 1 2 3 4 5 6 7' 



The fourth joint bears one and the last joint two slender sensory hairs at their distal 

 end. The last three joints also bear a number of long plain sette. Posterior antennne 

 4-jointed, the first two short, the third and fourth longer, subequal ; a small 1-joiuted 

 secondary branch springs from near the end of the second joint. The mouth-organs and 

 s-wimming-f eet are similar to those of JEtiterpe gracilis, but with the following differences : — 

 The second joint of the inner branches of the first pair of swimming-feet bears a mode- 

 rately long and stout setiferous terminal spine, which is curved outwards ; near the middle 

 of the same joint is a curved transverse row of seta) extending from the outer margin to 

 fully halfway across the joint. The extremity of the outer branches of the second pair is 

 furnished with a long spine, finely serrate on the outer edge, a shorter setiferous spine, 

 a long slender plumose seta, and several small setose spines ; the inner branches also bear 

 a row of small spines at their extremities in addition to the jjluuiose hairs. The inner 

 branches of the third and fourth pairs are each armed with a long, stout, strongly seti- 



