324 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



racic region. The first segment is shorter than the second ; the sec- 

 ond, third, and fourth are about equal in length; the fifth is about 

 the length of the first; the sixth and seventh each a little longer. The 

 first segment is acutely produced at the sides, around the sides of the 

 head, and bears, near the middle of the anterior margin, two short spines, 

 situated about half as far apart as are the eyes, and directed upward and 

 somewhat forward. The second segment has both lateral angles pro- 

 duced into triangular acute processes, of which the anterior is more slen- 

 der than the posterior and directed more strongly forward. The dorsal 

 spines on this segment are a little farther apart and larger than in the 

 first segment. In the third segment the lateral angulations are more 

 nearly equal than in the second segment and directed less strongly for- 

 ward. In the specimen figured the third segment bears, on the left side, 

 a single broad angulation, apparently representing the posterior, while 

 the anterior is only indicated by a slight irregularity in the outline. 

 Malformations of this kind appear to be common. The dorsal spines on 

 the third segment are much as in the second. On the fourth segment 

 the anterior angulation is longer than the posterior, and both are directed 

 nearly outward. The dorsal spines on the fourth segment are slightly 

 smaller and nearer together than on the third ; but, as in all the preced- 

 ing segments, they are near the anterior border of the segment. The 

 last three segments are acutely produced at the sides into a single angu- 

 lation, which is directed more and more backward to the last segment. 

 The dorsal spines on the fifth segment are situated nearer together than 

 on the anterior segments, and rather behind the middle of the segment; 

 they are also smaller than on the preceding segments. On the last two 

 segments they are near the posterior 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 very 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. 



This species is near Janira laciniata Gr. O. Sars,* but is distinguished 

 by the double row of dorsal spines, whereas Sars says of that species, 

 " Superficies dorsalis medio leviter convexa spinis siugulis tenuibus 

 ornata." 



The only specimens yet known are two females, which were taken ad- 

 hering to the cable of the schooner ' Marion ', by Captain J. W. Collins, at 

 Banquereau, August 25, 1878. 



*Chr. Vid. Selsk., 1872, p. 92, 1873. 



