ISOI'ODS OF NORTH AMERICA. lti\) 



c'. Basal article of the peiluncle nf tlu^ aiitenmila' very iiiucli <lilate(l, neen from 

 below, 80 prominent that the l)asal joints of the antennae are i)lace(l in a 

 transverse cleft moderately deep between the aiitennuUe and the mandi- 

 bles. Last segment of the body ornamented wit li two large basal tuber- 

 cles situated near the median line. 

 d. Fourtli and fifth segments of the alxlomen a little imj>ressed in the dorsal 

 median line, not ornamented with carina' or tubercles. Last segment of 

 the abdomen with two spines at the apex. 



E.a>cornll<tn(( t^ubtilis (Hansen) 

 d\ Fourth and fifth segments of the abdomen with a deep longitudinal exca- 

 vation in the dorsal median line, ornamented with many carinse and 

 tubercles. Last segment of the al)domen with four spines at the a])ex. 



Exocorallana antillenns (Hansen) 

 a. Eyes very large, contiguous in the middle of the head. 



I/. I.,ast segment of the abdomen rather short, widely rounded jKjsteriorly and with 

 a median excavation deep and moderately wide. 



Exocorcdlawi fisaicaiida ( Hansen) 

 ?/. Last segment of the abdomen rather long, narrowly rounded posteriorly, with 

 no excavation, 

 c. Fourth and fifth segments of the abdomen deeph' excavate longitudinally in 

 the dorsal median line and ornamented with carinse. Last segment of the 

 body with an incision in the middle of the side and ornamented on the 

 dorsal surface with two densely setose areas and with two large basal tuber- 

 cles situated near the median line Exocoralldna oculata (Hansen) 



c^. Fourth and fifth segments of the body very little impressed in the dorsal 

 median line, ornamented with no carinte. Last segment of the abdomen 

 entire at the sides, ornamented on the dorsal surface everywhere with very 

 short hairs remotely scattered Exocoralhwa irarmingii (Hansen) 



EXOCORALLANA TRICORNIS (Hansen). 



Corallana triconils Hax.sex, Vidensk. Selsk. 8kr. (6), V, 1890, pp. 379-381, pi. vi, 

 figs. 4^p; pi. VII, figs. 1-1 d. — Richardson, Proceedings U. S. Nat. Mus., 

 XXIII, 1901, p. 518.— Moore, Bull. U. 8. Fish Comm., XX, Pt. 2, 1902, 

 ]). 169, pi. IX, figs. 2-5. 



Localities. — Cape Catoehe, Yucatan; between Delta of the Mis.sis- 

 sippi and Cedar Keys, Florida; St. Thomas, West Indies; Ilucares, 

 Porto Kico; St. Croix, West Indies; Jamaica; Belize, British Honduras; 

 Kealejo, Nicaragua, Central America. 



I)ej)fL —24-27 fathoms. 



Bod}'^ narrow, elonoatc, three times lono-er than wide, 4 mm. ; 12 mm. 



Head wide'r than long, 1 mm.; 2 nun. witii the antero-Iateral nuir- 

 gins rounded and ])r()duced in the middle in a i)romiiietit triangidar 

 process half a mm. in length, with broad base and apex emarginat«> or 

 slightly l)ifid and directed upward, the whole process forming a right 

 angle with the dor.sal surface of the head. The eyes are large, con- 

 spicuous, and composite and occupy a large portion of the dorsal sur- 

 face of the head; they are separated from each other hy a median 

 groove which extends from the base of the frontal process to the 

 posterior margin of the head. On the posterior portion of the head 

 are two large, prominent tubercles, one on either side of the median 



