ISOPOD ANUEOPUS BEANCHIATUS. 17 



joints with a number of short setae and spines is shown in fig. 7 ; 

 the seventh joint (7) is only about one-fourth the length of 

 the preceding joint; the claw was broken off, but it can be 

 said with certainty that it must have been very short. Of all the 

 other legs at least one joint and often more joints were absent ; 

 but these fifth pairs seem to have differed ouly in quite un- 

 important features, for instance as to length, from the fourth 

 pair. Beddard's fig. 2 shows all the legs, but in the text he 

 states that the distal joints of the second pair were missing ; 

 the figure is moderately good, but it must be mentioned that the 

 terminal joint of the legs is too long. 



Abdomen and its Legs. — The abdomen has been moderately well 

 drawn in Beddard's fig. 1. It increases gradually somewhat in 

 breadth from the base to the middle of the sixth segment ; the 

 five proximal segments are subequal in shape, and similar to the 

 same segments in the males of some species of Eurydice, with 

 the exception that in the last-named genus these segments do 

 not increase in breadth posteriorly. The sixth segment is a 

 large shield, nearly circularly rounded on the sides and behind, 

 without hairs or sj)ines on the posterior margin. 



The five pairs of pleopods are shaped about as in Cirolana ; 

 both rami of the same pair and the rami of all pairs are similar 

 in quality and without marginal hairs. In the first pair the inner 

 posterior angle of the peduncle has a series of more than ten 

 €oupling-hooks ; such hooks are also present on the second, third, 

 and fourth, but not on the fifth pair. The wopods originate 

 close behind the anterior angle of the segment on its lower side 

 near the lateral margin ; the outer edge of the peduncle protrudes 

 beyond that margin. The peduncle is very small, very short, and 

 rather narrow ; the postero-interior process is short. The inner 

 ramus reaches nearly to the hind margin of the abdomen ; it is 

 oblong- ovate, a little longer and a little narrower than the 

 outer ramus ; both rami are similar in quality to those of the 

 pleopods. It has been pointed out by Beddard that the uropods 

 have a respiratory function as the rami of the pleopods, and are 

 concealed beneath the last abdominal segment. 



LengtJi and Sex. — The specimen measures, as stated by Beddard, 

 70 mm. in length. It has no trace of marsupial lamellae or of 

 " appendix masculina " on the second pair of pleopods. I forgot 

 to look for genital processes on the last thoracic segment, and 



LINK. JOUElSr. — ZOOLOGY, VOL. XXIX. 2 



