ORAL APPENDAGES OF MARINE ISOPODA. 81 



usually dark green or brownish, with patches of yellow or whitish, trans- 

 versely or obliquely arranged. 



The First Maxilla (PL 8. fig. 19) lias the outer lobe strongly curved in- 

 wards. There are eleven spines and a fine setule on the ventral surface. 

 Four or five of the innermost spines are denticulate. The inner lobe is 

 fairly large and has three stout setose spines terminally and a setule on the 

 anterior outer margin. 



The Maxillipede (PI. 8. fig. 20). — Of the two figures given by Harger and 

 Richardson of this appendage, that of the former is the better, although both 

 differ considerably from the condition noted in the specimens I have ex- 

 amined. The coxopodite has the two usual divisions. The basipodite is 

 elongated and narrower than the epipodite. The four-jointed palp is half 

 again as long as the basipodite, the first and third joints are small, whilst the 

 second is longer and greatly expanded at the anterior margin on the outer 

 side. The inner distal lobe extends forward almost to the end of the third 

 joint of the palp, terminally it is surmounted with a number of setose and 

 plain spines. The epipodite is shown by Harger with an almost straight 

 inner margin and a narrow, bluntly pointed apical portion lying beneath 

 the third joint of the palp. In all the specimens I have examined, 

 both the inner and outer margins are curved outwards, and with the 

 apical portion slightly narrower and not extending beyond the second joint 

 of the palp. 



The metasome (PI. 8. fig. 22) is composed of two short joints, a single 

 suture, and the large terminal segment. This latter is more triangular 

 than in I. granulosa, rather shorter, and shows a faint constriction about its 

 middle, then widening slightly, it terminates somewhat abruptly in a sharp 

 point. 



The uropod (PL 8. fig. 23) is characterized by the triangular-shaped endo- 

 podite, which is rather longer than wide. 



Parldotea, Stebbing. 



11. Paridotea ungulata (Pallas). (PL 8. figs. 24, 25.) 



Oniscus vngulatus, Pallas, Spicil. Zool. vol. ix. (1772) p. 62, pi. 4. fig. 11. 



Idotea ungulata, Lamarck, Hist. Anim. sans Vert. vol. v. (181S) p. 160. 



Idotea lalandii, Milne-Edwards, Hist. Nat. Crust, vol. iii. (1840) p. 132, pi. 31. fig. 7 ; 



Krauss, Sudafrik. Crust. 1843, p. 61. 

 Idotea affinis, Milne-Edwards, Hist. Nat. Crust, vol. iii. (1840) p. 133 ; Krauss, Sudafrik. 



Crust. 1843, p. 61 . 

 Idotea edivardsii, Gue'rin-Me'neville, Icon. Piegne Anim. 1829-44, Crust, p. 33. 

 Idotea nitida, Heller, Verliandl. zool.-bot. Ges. Wien, 1861, p. 497. 

 ? Idotea excavata, Haswell, Proc. Linn. Soc. N.S.W. vol. vi. (1882) p. 2. 



LINN. JOURN. ZOOLOGY, VOL. XXXIV. 



