78 DR. Vv r . E. COLLINGE ON THE 



Hie Ma.villipede (PI. 7. fig. 13). — This appendage in this species shows a 

 strono- resemblance to the condition obtaining in the genus Pentidotea, only 

 it is less robust and considerably narrower. The divisions of the coxopodite 

 are large and slightly overlap one another. The basipodite is narrow and 

 elongated, with a straight inner margin and narrowest about its middle. 

 The posterior margin slopes upwards and outwards. The five-jointed palp 

 presents all the characteristic features seen in Pentidotea, and is half again 

 as Ion a - as the basipodite. The inner distal lobe reaches almost to the end of 

 the extended inner margin of the third lobe of the palp. There are a number 

 of setose and plain spines distally of a rather more robust type than in Penti- 

 dotea. The epipodite proximally is wider than the basipodite, but its distal 

 third narrows considerably, becoming bluntly pointed at its apical margin. 

 It extends forward as far as the anterior outer margin oE the second joint of 

 the palp. 



It is somewhat doubtful whether or not this species is entitled to separate 

 generic rank or whether it is not synonymous with Paridotea, Stebbing. In 

 both genera the palp oE the maxillipedes consists of five joints, and the meta- 

 some is composed of a single segment and three pairs oE sutures. The most 

 striking difference between the two genera is seen, perhaps, in the form of the 

 cephalon. 



Idotea, Fabricius. 

 9. Idotea eectilinea, Lockington. (PI. 7. figs. II, 15.) 



Idotea rectilinea, Loclrington, Proc. Cal. Acad. Sci. vol. vii. (1877) p. 36; Richardson, 

 Proc. U.S. Nat. Mus. vol. xxii. (1900) p. 131, fig. 5 c; Bull. No. 54, U.S. Nat. Mus. 

 1905, p. 360, tigs. 389-391. 



The First Maxilla (PI. 7. fig. II).— This appendage has not previously 

 been described or figured in this species. The outer lobe terminates in 

 twelve strong curved spines, of which three or four at the inner side are 

 denticulate. The inner lobe has three setose spines and a small curved setule 

 on the ventral outer margin ; there are numerous long fine setse on the inner 

 margin . 



The Maxillipede (PI. 7. fig. 15).— Miss Richardson gives a figure of this 

 appendage in which the coxopodite is shown as a single piece and the general 

 shape is scarcely correct. 



The coxopodite consists of two large stout nodules, one lying at the base 

 of the epipodite and the other at the base oE the basipodite. In all o£ the 

 specimens examined these had the large cuboid form shown in fig. '15. 

 The anterior margin of the basipodite is produced slightly on each side of 

 the first joint of the palp. Its inner, outer, and posterior margins are almost 

 straight. The palp is composed oE four joints, of which the third is rather 

 smaller than usual. The inner distal lobe has an almost straight anterior 



