146 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



tuberculated on their posterior margins. The fifth segment is also tuber 

 culated, the tubercles on either side of the median line of tubercles 

 being' larger and more conspicuous. At tlie base of the terminal 

 segment are four tubercles, the two center ones being the largest. 

 The terminal segment is subtriangular with trun- 

 cate apex. The posterior margin is armed with 

 spines. The inner branch of the uropoda is trun- 

 cate posteriori} 7 and armed with spines; it is 

 about twice as broad 

 as the outer branch, 

 which is lanceolate in 

 shape. 



The type specimen 

 is from Catalina Is- 

 land, California; col- 

 lected by Dr. J. G. 



FIG. 129. EXOCORALLANA 

 TRUNCATA. X 131. , 

 HEAD. 6, ABDOMEN AND 

 LAST THORACIC SEG- 

 MENT. 



Type. Cat. No. 



22566, U.S.N.M. 



EXOCORALLANA SUBTILIS (Hansen). 



Corallana subtilis HANSEN, Vidensk. Selsk. 

 Skr. (6), V, 1890, pp. 382-383, pi. vn, 

 figs. 3-3c. RICHARDSON, Proc. U. 6. Nat. 

 Mus., XXIII, 1901, p. 519. 



Locality. St. Thomas, West Indies. 



A single young specimen in the process 

 of ecdysis was taken, and on that account 

 is rather different from other species in 

 appearance. 



The front of the head is produced in a 

 rather large triangular process. The 

 first pair of antennae have the basal ar- 

 ticle of the peduncle strongly dilated 

 when seen from above; when seen from 

 below it projects in such a way that the 

 basal articles of the second antennae are 

 placed in a rather deep cleft between the first pair of antenna? and 

 the mandibles. The first pair of antennae have the second article 

 of the peduncle slender; the flagellum is composed of about seven 

 articles. The eyes are slightly granulated. 



The frontal lamina is a little longer than wide, somewhat nar- 

 rower toward the apex, with the apex rounded and superficially 

 excavated. 



FIG. 130. EXOCORALLANA SUBTILIS. 

 (AFTER HANSEN). a, POSTERIOR PART 



OF ABDOMEN. X 16. 6. HEAD. X 19. 

 C, YOUNG SPECIMEN TAKEN IN PROC- 

 ESS OF ECDYSIS. x *. d, LATERAL 



VIEW OF SAME (RIGHT SIDE). 



