488 



BULLETIN OF THE BUREAU OP FISHERIES. 



about eighl setae; outer plates reaching only a little beyond middle of broad second jointof palp, inner 

 margins armed with about ten strong spines, which increase rapidly in length toward distal end, 

 where there are two setae, which form a continuation of the spine row; outer margin without setse; 

 palp large, terminal joint a stout, nearly straight claw; coxal plates unusually small; first gnathopods 

 with carpal lobe long, distally setose; hand oval, palm evenly convex, a little larger than posterior 

 margin of hand, and furnished with a spine at distal end; second gnathopods with carpal lobe slender, 

 extending along posterior side of hand as far as palm; hand oblong, palm about as long as posterior 

 margin of hand and armed with a spine at distal end; propodi of first and second peraeopods short, 

 with several tufts of very long setee on both margins; dactyls over half length of propodi; third and 

 fourth peraeopods with merus broad and produced into an obtuse triangular lobe at postero-inferior 

 angle; dactyls over half length of propodi; last perseopods with basal joint nearly as wide at base as it 

 is long; propodus longer than merua or carpus, and about equaling styliform dactyl; third abdominal 

 segment with postero-lateral angles rounded; rami of first uropods shorter than peduncle; those of 

 last uropods a little longer than peduncle; telson oblong, distally rounded. 



Length of specimen examined, 9 mm. 



Described from a single specimen taken by Mr. V. N. Edwards at Woods Hole, Mass., along with 

 specimens of Calliopius Ixviusculus and Gammarus. The eyes could not be seen with distinctness. 

 S iveral smaller specimens, which were taken by Mr. Judd at Newport, were examined. In several 

 of these the rostrum was curved downward more strongly than in the specimen figured. Type No. 

 29243, fj. s. Nat. Mus. 



Pleustes panoplus (Kroyer). 



Ampkit honotus cataphractics Stimpson, Marine Invert. Grand Marian, p. , r v2, 1853. 



Rostrum well developed, triangular, acute, concave above, furnished with a median ridge below, 

 and curved slightly downward; eyes rounded, convex, situated widely apart; antennae short, scarcely 

 half length of thorax and of subequal length; tirst joint of first pair a little longer than next two and 



Pleustes panoplus. Labrador, a, Abdomen and uropods. 



very much thicker; fiagellum larger than peduncle; last two joints of peduncle of second antenna' of 

 subequal length; fiagellum a little shorter than peduncle; thorax broad, with a median dorsal carina 

 on all segments; lateral margins of segments produced into a ridge, which in last three or four segments 

 is produced posteriorly into a tooth; a tooth on posterior margin of last two thoracic segments on 

 either side of dorsal carina; first three segments of abdomen furnished with a median dorsal keel which 

 decreases in height posteriorly; a carina on either side of the middle on all abdominal segments, repre- 

 sented on tin- first segment by a tooth on the posterior margin, on the second segment by a large 

 flattened tooth which projects behind the posterior margin, on the third by a ridge which is produced 

 into a tooth near the middle, on the fourth by a ridge which is elevated near its anterior and at its 

 posterior end; a small tooth on posterior margin of first two abdominal segments below lateral carina; 

 postero-lateral angles of second and third segments of abdomen acute; first four coxal plates large, 



