460 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



are slightly smaller and nearer together than on the third; but, as in 

 all the preceding segments, they are near the anterior border of the 

 segment. The last three segments are acutely produced at the sides 

 into a single angulation, which is directed more and more backward 

 to the last segment. The dorsal spines on the fifth segment are sit- 

 uated nearer together than on the anterior segments and rather behind 

 the middle of the segment. They are also smaller than on the pre- 

 ceding segments. On the last two segments they are near the poste- 

 rior border of the segment, and become somewhat smaller and nearer 

 together on the last segment. The legs are armed with but few and 

 rather weak spines. 



"The pleon is broadest near the base and tapers posteriorly, where 

 the angles are acutely produced. Between these angles the margin is 

 rounded and arched over the bases of the uropods, which are about as 

 long as the pleon and less spiny than in J. alta. The lateral margin 

 of the pleon is armed with ver}' minute acute spinules, and under a 

 higher power the margins of the thoracic segments and of the head 

 are seen to be similarly armed, especially where most exposed. 



"Length 8 mm., breadth 3.8 mm.; color in alcohol white." OSCAR 

 HARGER. 



IOLELLA SPECIOSA & (Bovallius). 



lanthe speciosa BOVALLIUS, Bihang till K. Sv. Vet. Akad. Handl., VI, 1881, No. 

 4, pp. 5-14, pis. i-ui; XI, No. 15, 1886, p. 35. RICHARDSON, American Natur- 

 alist, XXXIV, 1900, p. 299; Proc. U. 8. Nat. Mus., XXIII, 1901, p. 555. 



Z,ocality. Baffin Bay. 



"The rostrum is much longer than the head (7:5); the lateral angu- 

 lations of the head are directed obliquely forward; they are longer 

 than the head. The eyes are oval. The long diameter of the eyes 

 equals a sixth of the length of the head. The flagellum of the first 

 pair of antennae is 60-70 articulated. The first pair of antennae are 

 nearly as long as the breadth of the head (18: 19). The flagellum of 

 the second pair of antennas consists of almost 280 articuli. The first 

 segment of the pereion is as long as the second; the seventh segment 

 is the longest. All carry each two spine-like tubercles on the dorsal 

 side. The lateral margins of the first segment carry one angulation 

 on each side; the second, third, and fourth two, more or less equal; 

 the fifth, sixth, and seventh, one large and one very minute each. The 

 pleon carries on its dorsal-side a single spine-like tubercle, and is pro- 

 duced backward into two flattened, sharp-pointed angulations; between 



these the uropoda are attached. The peduncles of the uropoda are 



. : / 1_ 



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



6 This species is considered by Hansen and Ortmann to be a synonym of the pre- 

 ceding species. Since my manuscript went to press, the types of /. spinosa have 

 been sent from Yale University, and I find it distinct from J. speciosa. 



