458 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



b f . Rostrum much longer than head. Flagellum of first pair of antenna? composed 

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

 gellum of second pair of antenna 1 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 lolella xpeciom (Bovallius ) 



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

 b. Head with prominent rostrum. 



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

 of body with central and post-lateral lobes acute, triangular. 



lolella trictngulata (Richardson) 

 </. 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) 



d' '. 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 



V. 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 of body with post-lateral angles rounded. 



lolella erostrata (Richardson) 



cf . Antero-lateral angles of head not produced. Sides of head produced. 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 spines. Terminal segment 

 of body with three small lobes between the post-lateral angles. 



lolella sarsi, new species 



IOLELLA SPINOSA (Harger). 



Janira spinosa HARGER, Proc. U. S. Nat. Mus., II, 1879, p. 158; Report U. S. 



Commissioner of Fish and Fisheries, 1880, Pt. 6, pp. 323-324. 

 lanthe spinosa BOVALLIUS, Bihang till Kgl. Sv. Vet. Akad. Handl., XI, 1886, 



No. 15, p. 34. 

 Janira spinosa HANSEN (part), Vid. Medd. naturh. Foren. i Kj0bh., 1887-88,. 



p. 191. 

 lanthe spinosa RICHARDSON, Amer. Naturalist, XXXIV, 1900, p. 299; Proc. U. S. 



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



Localities. Banquereau; latitude 65 35' north, longitude 54 50' 

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

 north, longitude 56 33' west. 



Depth. 80 to 100 fathoms. 



"This species is well marked among our known Isopoda by the 

 double row of spines along the back and the acute laciniations or 

 angulations on the lateral margins of the thoracic segments. 



