1SOPODS OF NOKTH AMEKICA. 



159 



ALCIRONA HIRSUTA Moore. 



Aldrona hirsuta MOORE, Bull. U. 8. Fish Comm., XX, Pt. 2, 1902, p. 170, pi. ix, 

 figs. 6-10. 



Locality. Off St. Thomas. 



Depth. 20-23 fathoms. 



Found in coral bottom. 



"Front slightly produced and somewhat inflexed between the bases 

 of the antennules, not joining the epistome; eyes small, lateral, dis- 

 tance between two or three times their diameter. Body strongly 

 arched antero- posteriorly. Epistome narrow, pentagonal. First 

 antennae with two-jointed peduncle reaching to about end of fourth 



FIG. 139. ALCIRONA KKEBSII (AFTER HANSEN). a, MAXILLIPED. 6, FIRST MAXILLA, c, DISTAL 



PART OF MANDIBLE. (I, DORSAL VIEW OF FEMALE. , LEFT PLEOPOD OF SECOND PAIR IN YOUNG 



MALE. /, LATF.RAL VIEW OF FEMALE, g, LEG OF FIFTH PAIR, h, LEG OF SEVENTH PAIR, i, MAN- 

 DIBLE, j, DISTAL PART OF MANDIBLE, k, SECOND MAXILLA. I, DISTAL PART OF MANDIBLE, in, LEFT 



PLEOPOD OF SECOND PAIR IN ADULT MALE. n, LEG OF SECOND PAIR. 0, POSTERIOR PART OF ABDO- 

 MEN (ADULT MALE), p, ANTERIOR PART OF HEAD FROM BELOW. 



joint of antennal peduncle. Flagellum slightly shorter than peduncle, 

 of seven joints, first joint as long as second and third. Second antennae 

 reaching to middle of third segment, with five-jointed peduncle; first 

 three joints short, fourth and fifth joints each about twice as long as 

 third and subequal, flagellum with seventeen joints. Mandibular palp 

 rather robust, three-jointed, second joint longest, second and third 

 joints with setae. 



" Maxillipeds with five-jointed rather robust palps. 



"First segment of trunk about 1.6 times as long as second, the next 

 five equal, the seventh a little shorter; third segment with a few setae 

 on lateral portion of posterior margin; fourth, fifth, sixth, and seventh 



