NO. 1309. XATCJiAL HISTORY OF THE LSOPt>DA—JiJCJlAJ:j)SO\. (J8l 



Fig. :«.— Fik.st l.\mell.\ of 



MARSIPIUM OF EnTOPHIH.9 

 OMNITECTUS. X 14i. 



of these plates is rather doubtful, but it seems probable that they 

 correspond to the "lames pleurales" of (xiard and Boimioi-. 



The five pairs of abdominal plate.s, wliicli meet in the incdiiin line 

 on the dorsal side, extend around the sides of the al)domen and onid- 

 ually almost come together on the ventral side, the l:i>t puii- hcinir 

 very much closer totrether than the tirst pair. 

 The last two pairs of plates are almost con- 

 cealed by the overlappino- plates of the preced- 

 ino- segments. 



The extremity of the abdomen is truncate and 

 without uropoda. The pleopoda (tig. ;>T) arc 

 live pairs of double-branched tapering append- 

 ages, all similar in sha[)e. 



Thei'e are five pairs of incu- 

 batory lamella^, which form 

 the ventral side of the mar- 

 supial pouch, enclosing it completely, the lamelh\? 

 overlapping in the median line. (Fig. 38.) 



Seven pairs of small, feeble legs are present, a })air 

 for each segment of the thorax. 



The male (tig. 39) is narrow and elongate and with- 

 out any color markings. The head is very large and 

 without eyes. The seven segments of the thorax are 

 about equal in length, each one carrying a pair of 

 appendages, so that there are seven pairs of 

 thoracic legs in all. The six segments of the 

 abdomen are distinct, the terminal one being- 

 rounded and carrying a pair of single- 

 branched appendages, the uropoda; the live 

 preceding abdominal segments are provided 

 each with a pair of single-branched, well 

 developed pleopoda. 



A large number of specimens were o))- 

 tained by the U. S. Fish Commission steamer 

 AIhatros.'< on the north and northeast coast 

 of Main Island, Hawaiian Islands, and the 

 northeast approach to Pailolo Channel, be- 

 tween Main Island and Molokai Island. 



The parasites were found in the visceral 

 cavity of Munnida normani Henderson. 

 This is the first instance of the discovery of a Bopyrid in that position 

 in relation to its host, all the other known representatives of the family 

 being either branchial or al)dominal parasites. The Entoniscidie^ 

 on the other hand, are always found in the visceral cavity. 

 Type.—Cdit. No. 28967, U.S.N. M. 



Fig. 37.— One double- 

 branched PLEOPOD 

 OF EnTOPHILUS OM- 

 NITECTUS. X ]7f. 



n h 



Fig. 39.— Estophims oMXiTEtTrs. 



MALE. a. DORSAL VIEW: ft, VEN- 

 TRAL VIEW. X HJ. 



