458 BULLETIN "4, UNITED STATES NATIONAL MUSEUM. 



//. Rostrum niucli longer than head. FlageUnin of hrst pair of antenu;e eoniponed 

 of sixty to seventy articles, nearly as long as the breadth of the head. Fla- 

 gellum of second pair of antennae composed of two hundred and eighty articles. 

 First thoracic segment as long as second. Seventh segment longest. Termi- 

 nal segment of body, with a single spine-like tubercle on its dorsal side. 

 Peduncle of uropoda shorter than post-lateral angulations of terminal seg- 

 ment of body lo/ellu ftpedom ( Bovallius ) 



a\ Segments of thorax .smooth on the dorsal surface. 

 h. Head with prominent rostrum. 

 c. Lateral margins of head produced into two angulations. Terminal segment 

 of body with central and post-lateral lol)es acute, triangular. 



lolella triangnlatu (Richardson) 

 c'. Lateral margins of head produced in one angulation. Terminal segment of 

 body with central and post-lateral lobes rounded. 

 d. Lateral angulations of head long, about as long as rostrum. Median lobe 

 of pleon about as wide and long as post-lateral lobes. 



lolella libbeyi (Ortmann) 

 cV. Lateral angulations of head short, much shorter than rostrum. Median 

 lobe of pleon much narrower and shorter than post-lateral lobes. 



lolella alascensis Benedict, new species 



y. Head without rostrum, in place of which is small median point. 



c. Antero-lateral angles of head acutely produced. Sides of head not produced. 



Epimera of second, third, and fourth segments of thorax consisting each of 



a single lobe. Terminal segment (^f body with post-lateral angles'rounded. 



lolella erostrata (Richardson) 

 &. Antero-lateral angles of head not ijroduced. Sides of head ])roduced. Epi- 

 mera of second, third, and fourth segments of thorax bifurcate. Terminal 

 segment of body with post- lateral angles acute. 

 d. Sides of head produced in a bifurcate process. Terminal segment of body 

 with one large median lobe between the post-lateral angles. 



lolella holmesi (Richardson) 

 d^. Sides of head produced in an anterior lobe bearing three spines and a small, 

 inconspicuous lobe armed with three feeble si^ines. Terminal segment 

 of l)ody with three small lobes between the post-lateral angles. 



lolella sarsi, new species 



lOLELLA SPINOSA (Harger). 



Janira spbwsa Hakger, Proc. U. S. Nat. Mus., II, 1879, p. 158; Report U. S. 



Conmiissioner of Fish and Fisheries, 1880, Pt. 6, pj). 323-324. 

 lanthe sp'mosa Bovallius, Bihang till Kgl. Sv. Vet. Akad. Handl., XI, 1886, 



No. 15, p. 34. 

 Janira spiitosa Hansen (part), Vid. Medd. naturh. Foren. i KJ0T)h., 1887-88, 



p. 191. 

 lanihe sphiosa Richardson, Amer. Naturalist, XXXIY, 1900, p. 299; l^roc. V. S. 



Nat. Mus., XXIII, 1901, p. 555. 



Localities. — BaiKjuereau; latitude 05 35' north, longitude o-t' 50' 

 west; latitude 66° 32' north, longitude 55^ 34' west; latitude 67" 59' 

 north, longitude 56° 33' west. 



Depth.— '^0 to 100 fathoms. 



''This species is well marked among our known Isopoda hy the 

 doul)le I'ow of spines along the back and the acute laciniations or 

 angulations on the lateral margins of the thoracic segments. 



