REPORT ON THE AMPHIPODA. 1237 



Uropods. — Of these small appendages the first pair are the longer ; in each case the 

 first joint is much longer than the second, and its fringe of spinules on the concave side 

 much stronger. 



Length. — The longest specimen is figured at the top of PI. CXXXIX., to the right. 

 From head to pleon, in the position figured, this measures an inch and a half ; the upper 

 antennae in front are more than an inch long, and the hinder perseopods are capable of 

 extension to the length of half an inch, giving a total extensibility of at least three 

 inches ; the second gnathopods in this specimen are an inch in length ; more than any 

 other Crustacean, with the exception perhaps of Rhabdonectes, this animal suggests the 

 geometrician's definition of a line, as length without breadth. The females, which do 

 not appear to attain so great a length as the males, are as usual broader in the marsupial 

 region. 



Localities. — Station 149f, Rhodes Bay, Kerguelen Island, January 27, 1874 ; 

 depth, 95 fathoms ; bottom, volcanic mud. A male and three females (mounted in 

 Canada balsam) ; also a great entangled mass of specimens of both sexes. 



Station 149g, off London River, Kerguelen Island, January 29, 1874; depth, 

 1 1 fathoms ; bottom, volcanic mud. One specimen, female, and two mounted specimens. 



Kerguelen ; 100 fathoms; two mounted specimens, female (Stations 149g or 149j). 



Genus Caprellinoid.es, n. gen. 



Mandibles with a three-jointed palp. 



Lower Antennae with a flagellum of (probably) more than two joints. 



The Third Perseopods with only three distinct joints, of which the last is not 

 unguiform ; the First and Second Perseopods wanting. 



Branchial Vesicles only on the third and fourth segments of the Perseon. 



Pleon one-jointed. 



The generic name alludes to the likeness between this genus and Caprellina, 

 G. M. Thomson. The name Ca'prellina, having been earlier applied to the whole group, 

 cannot, I think, be used for a genus within the group, and I have therefore proposed in 

 the Note on Nicolet, 1849 (p. 233), to change it into Caprellinopsis, being under the 

 impression at the time that Note was written that the species for which a new genus is 

 now instituted would fall under Mr. Thomson's Caprellina. Caprellinopsis, however, 

 differs from Caprellinoides, in that the mandibles have, besides several slender spines, 

 two broad laminar spines like those in Dodecas elongata, and that it has three pairs of 

 branchial vesicles, and the degraded third perseopods ending in a strong claw. 



In Mayer's first system Caprellinoides will stand between Caprellinopsis ( = Caprel- 

 lina, Thomson) and Podalirius. in his second perhaps between Proto and Caprelliiwpsis, 



