MUSEUM OF COMPAKATIVE ZOOLOGY. 97 



Rocinela oculata sp. nov. 



Plate III. Figs. 2 - 2 a. Plate IV. Fig. 1, 



Body oval, length a little more than twice the breadth, surface sparsely- 

 punctate. 



Head subreniform, produced in front into a truncated process over the bases 

 of the antennula), yoke-shaped behind, the ocular lobes projecting, upper sur- 

 face nearly covered with the large eyes in which the ocelli are large and quin- 

 cuncially arranged in ten rows along the long axis of each eye. Five of these 

 rows meet along the median line. 



The antennuloe are slender and scarcely attain the tip of the antennal pe- 

 duncle; the basal segment is short and concealed from above; the second is 

 longer than the first; the third is slender, but not as long as the first two 

 together; flagellum about as long as the peduncle, slender and composed of 

 five segments, of which the first is much the longest and the last is the short- 

 est, and does not quite attain the posterior border of the eye when the anten- 

 nula is reflexed. The antennae surpass the first thoracic segment; the first two 

 segments are very short; the flagellum is about twelve-jointed. 



First thoracic segment closely adapted to the head in front ; fourth segment 

 longest on the median line above; sixth short; seventh nearly concealed and 

 quite small, although bearing a well-developed pair of legs below. 



The epimera of the second and third segments are oblique, but not acute nor 

 produced backward in a lateral view; in the four following segments they are 

 produced and very acute ; the seventh epimeron is much smaller than the 

 sixth, and, owing to the shortness of the seventh segment, ends behind about 

 on a line with it, both epimera surpassing the first segment of the pleon. 



Legs of the first pair (PI. IV. Fig. 1) slender, armed with a long slender 

 dactylus, much curved near its base; propodus expanded with a large palmar 

 lobe armed with a marginal row of eight curved spines ; carpus short, with a 

 single curved palmar spine. Legs of the second and third pair much like the 

 first, but with only six spines on the propodus. Legs of the fourth and poste- 

 rior pairs slender, armed with spines principally at the distal ends of the 

 ischium, merus, and carpus. 



First segment of pleon very short and nearly concealed by the thoracic seg- 

 ments, narrower than the next three segments, which are about equal, acutely 

 produced at the sides so as to resemble in shape the seventh epimeron; fifth 

 segment naiTower than fourth, but somewhat longer on the median line ; tel- 

 son semi-oval, regularly rounded behind and ciliated. Uropods equalling the 

 telson ; inner angle of basal segment produced, about one third the length of 

 the inner ramus, which is ligulate, rounded behind, slightly shorter than the 

 outer, and less than half as broad; outer ramus obovate, spinulose along the 

 outer border; both rami ciliated except near the base. 



Length, 13.5 mm.; breadth, 6 mm. 



VOL. XI. — NO. 4. 7 



