HANSEN: THE ISOPODA. Ill 



folded. The dorsal surface of this last segment sometimes with tolerably dis- 

 tinct, sometimes with verj^ faint median keel, and else almost all over finely 

 and densely pock-marked by exceedingly numerous and very small depressions. 

 (This structure is not clearly defined on the copperplate, as the depressions are 

 far more numerous than in the figure, and the intervals form a kind of irregular 

 reticular work.) 



Uropods. They have a very depressed peduncle and thin rami ; the outer 

 ramus is oblong-ovate, distally rounded ; the inner ramus is considerably 

 longer than the outer, with sub-acute end. 



Color. In the six larger specimens the head, the thorax, the five short 

 abdominal segments, and the basal part of the sixth segment, are yellowish 

 with innumerable dark dots ; the epimera of the three, and especially of the 

 two, posterior thoracic segments, and the lateral angles of the five anterior 

 abdominal segments are white ; almost the whole last abdominal segment is 

 grayish. In the smallest specimen the dorsal surface is darker, more grayish, 

 with exception of the two last pairs of thoracic epimera and the angles of the 

 five anterior abdominal segments, which are white. 



Size. The largest specimen is 20.5 mm. long, and 10.5 mm. broad ; the 

 smallest is 14.5 mm. long, and 8.2 mm. broad. 



Habitat. Station 3355 (Lat. 7° 12' 20" X., Long. 80° 55' W.), 182 fathoms, 

 2 specimens ; Station 3389 (Lat. 7° 16' 45" N., Long. 79° 56' 30" W.), 210 

 fathoms, 4 specimens ; Station 3391 (Lat. 7° 33'40"X., Long. 79° 43' 20" W.), 

 153 fathoms, 1 specimen. On the labels I do not find any mention of the 

 name or names of the fishes on which the parasites must have been found. 



Remarks. The species seems to be well distinguished, especially by the 

 pock-marked surface of the last abdominal segment. Xo males were found. 

 In the marsupium of one female I found " puUus stadii primi " of Schiodte 

 and ^leiiiert; in Figure 4 a a leg of the second pair, and in Figure 4 b the pos- 

 terior abdominal segments and the uropods of one of the specimens are shown. 

 This may be sufficient, as the young one in this stage is very similar to those 

 of the genus Lironeca drawn by Schiodte. Unfortunately, the "pullus stadii 

 secundi," always much more interesting, was not found. 



EPICARIDBA. 



As to the division of this very rich and highly interesting family into sub- 

 families the reader is referred to my above mentioned treatise on the Isopoda 

 of the Plankton Expedition. Of the four sub-families admitted (the very 

 doubtful Microniscinee not included) only one, viz. the Bopyrinse, is represented 

 in the collection. Of the five species secured both female and male — but no 

 young ones — are present of the four species, while the fifth species is repre- 

 sented only by a male and a small portion of a female. 



It is a rather unplea.«ant task to describe a few new forms of the Bopyrinae. 

 Most of the authors who have contributed to the knowledge of the group 



