Fig. 20.— Uropod and i,.\.st SKfJMENT op 



ABDOMEN OK TRICHONISCI S PAPII.LI- 



CORNIR. :-: 77. 



Fig. 21. — Uropod 

 of left side of 

 Trichoniscus 

 papillicornis. 



NO. 1369. XA TlltA L IIISTOR Y OF THE JS()POI)A~in< 'IIAIlDSOX. (',71 



last joint is tipped with a bunch of hairs. The hiucal inass is very 

 proiiiinont holow. 



The seo-ments of the thorax are about equal in leuo-th. The post- 

 lateral angles of all the segments, ex- 

 cept the tirst. are ])roduced l)ackward, 

 Aery slightly in the case 

 of the second, third, 

 and fourth, but becom- 

 ing gradually more so, 

 until the last two seg- 

 ments show this character 

 very markedly. 



The abdomen is nar- 

 rower than the thorax. 

 All the segments are visi- 

 ble in entirety, not 1)eing covered laterally l»y the last 

 thoracic segment. The terminal segment is triangu- 

 larh' produced with the apex 

 somewhat rounded. 

 The uropoda are short, styliform: the outer 

 branch is the stouter and extends a little be- 

 yond the extremity of the inner branch. Both 

 ])ranches are tipped with a few hairs. 



Only a single specimen was obtained b}- the 

 Harriman Alaska expedition, at Seldovia, Cook Inlet 

 on the beach. 



Tyjx'.—Cat. No. 28 7 72, U.S.N.M. 



VI. 



ISOPODS COLLECTED AT THE HAWAHAN ISLANDS BY THE V. S. FISH 

 COMMISSION STEAMER ALBATEOSS. 



The U. S. Fish Commission is undertaking a systematic exploration 

 of the marine fauna of the Hawaiian Islands, under the direction of 

 Dr. D. S. Jordan. During the summer of 1902, under the immediate 

 charge of Prof. C. H. Gilbert, the U. S. Fish Connnission steamer 

 AlhdtroSH was eng-aged in dredging in the vicinity, while a party of 

 assistants explored the shore and shallow water. 



The isopods collected were not luuuerous. Most of them are new U^ 

 science, only two species in the collection, Llgia hainillei<-'i-'< Dana and 

 Cymothoa recta Dana, having been previously recorded from the island.^. 



Two new genera of para.sitic isopods. n^presenting ditieiviit families 

 of Epicaridea, the Dujhhv and the Bopi/rldR', are herein described. 

 The Bopyrid genus is particularly interesting, because it is the first of 

 that family known to occur in the visceral cavity of Decajx >ds. the 

 Entoniseldn'. ii\ov\(i having l)een known to have that position in relation 

 to their hosts, the Brachyurous Crustacea. 

 Proc. N. :\r. vol. x.wii— 03 i7 



Kk;. 22.— Leg of first pair 



OF TRICHONISCI'S PAPILLI- 

 CORNIS. X 15. 



It was found 



