520 



BULLETIK OF THE BUREAU OF FISHERIES. 



TJnciola irrorata Say. 



Body depressed; eyes nearly round; head produced into an acute rostrum; antenna; of subequal 

 length and over half the length of body; peduncles elongate, that of first pair not so long as peduncle 

 of second and much more slender, with second joint nearly twice the length of first and third ; flagellum 

 of first antennfe much shorter than peduncle; secondary rlagellum consisting of four joints and shorter 

 than last basal joint; peduncle of second antennae very stout in the adult male and laterally compressed 

 at the base, antepenultimate joint with a rounded anterior lobe, penultimate joint high at base, but 

 tapering distally, armed within with a row of spines and in some specimens having an inferior lobe at 

 proximal end; last joint subcylindrical or only slightly tapering, nearly as long as but much narrower 

 than the preceding one; flagellum often not longer than last basal joint; in the- female the second 

 antenna' much more slender than in the male, and but little compressed laterally at base; penultimate 

 joint scarcely tapering: last basal joint and flagellum much as in the male; anterior gnathopods very 

 stout, of similar form in both sexes; basal joint very thick and hollowed out anteriorly to receive the 

 carpus and hand; carpus short, appearing as if forming a part of the hand; hand with carpus irregu- 

 larly ovate, a process at upper end of palm carrying a stout spine; second gnathopods small, hand 

 oblong, widest at the base where it is as broad as the carpus, narrowing distally; palm short, nearly 



Vhciola irrorata, male. Off Fishers Island. ep 3 , Thiril abdominal segment. 



transverse, intero-posterior angle of hand produced, posterior margin above this angle concave; both 

 margins of carpus and hand and anterior margin of basal joint furnished with tufts of long seta?; last 

 pair of perseopods much longer than others; dactyl long and slender; all of the coxal plates much 

 broader than high and the posterior ones produced at posterior angle, as are also the segments above 

 them; sides of first and second abdominal segments produced below into an acute posterior tooth; 

 postero-lateral angle of third segment produced into a huge, strongly upturned hook; uropods short; 

 peduncle of first pair with a short spine or tooth projecting backward from posterior end beneath the 

 rami; inner posterior angle with a strong spine; rami about two-thirds the length of peduncle; 

 peduncle of second pair with a strong spine at inner posterior angle, but no terminal spine or tooth 

 beneath rami; terminal uropods small; ramus short, not half the length of peduncle; inner posterior 

 angle of peduncle produced into a lobe which extends posteriorly as far as t i j > of ramus, giving the 

 appendage the appearance of being two-branched; telson rather large and rounded behind. 



Color in life usually bright red. The red is generally mottled with white and occasionally 

 individuals are met with which have very little red color. The first segment of the thorax is more 

 colored than the others. Bases of both antenna' red with orange.; flagella, with a double row of red 

 spots, one pair to each segment. 



Length, 15 mm. 



