ISOPODA. 61 



apical portion of the trunk. In both mandibles a rounded lobe is shown below the apical margin, 

 but this lobe was only indefinitely made out. mx. 1, mx. 2, map., first and second maxillae, with the 

 apices more highly magnified, and the maxillipeds. 

 B. Lanocira zeyh/nica, n. sp. n.s., lines indicating natural size of specimen figured above in dorsal view; 

 PL, dorsal view of pleon more highly magnified; a.S., a.i., first and second antennae; l.s., upper 

 lip; m., ?., mx. 1, mx. 1, mx. 2, mxp. the mandibles, first maxilla?, one of the second maxillae, and 

 the maxillipeds; <jh. 1, prp. 5, first gnathopod and fifth perajopod ; pip. I, pip. 2, first and second 

 pleopods. 



The mouth organs are more highly magnified than the other appendages. 



PLATE VI. 



A. Rhiothra cdllipia, Sciiiodte and Meinert. n.s., lines indicating natural size of male specimen figured 



above in dorsal view; ft, the head, stripped of its appendages, in dorsal view; a.s., a.i., the first 

 and second antenna 1 , with the terminal portion of each more highly magnified ; m., a mandible in 

 connexion with the epistome ; mx. 1, mx. 2, mxp., the first and second maxilhe and the maxillipeds; 

 gn. 1, pp. 5, the first gnathopod and the fifth peraeopod ; pip. 2, the second pleopod, a more 

 highly magnified portion showing the numerous coupling-spines of the peduncle and the male 

 appendix of the inner branch, urp., one of the uropods. 



The mouth organs are more highly magnified than the full figures of the other appendages. 



B. Irona nanoides, n. sp. n.s., lines indicating natural size of the female specimen figured at the centre 



in dorsal view; ft, the head, stripped of its appendages, in dorsal view; a.s., a.i., the first and 

 second antennae; m., the mandible in connexion with the upper lip; mx. 1, mxp., the first maxilla 

 and a maxilliped ; gn. 1, prp. 5, first gnathopod and fifth pera^opod ; pip., urp., a pleopod and one 

 of the uropods. 



The mouth organs are more highly magnified than the other parts. 



C. Rocinela oriental!*, Schiudte and Meinert. n.s., lines indicating natural size of specimen figured at 



the centre in dorsal view; n.s. $ , lines indicating natural size of a full-grown male specimen, from 

 which the figures marked $ are taken; a.s., a.s. $ , first antenna of each specimen; mxp., mxp. <$ , 

 one maxilliped of the smaller specimen and both maxillipeds of the larger; gn. 1, gn. 2, prp. 5, first 

 and second gnathopods and fifth peraeopod from the smaller specimen; pip. 2, second pleopod of 

 the full-grown male; PI. urp., dorsal view of the pleon of the smaller specimen, much of the right 

 side omitted for want of space; PL <J, urp., telsonic segment and left uropod of the full-grown 

 male in dorsal view. The unsymmetrical right margin of the segment is seen through the figure 

 of the transparent pleopod placed above it for convenience. 



The maxillipeds are more highly magnified than the other parts. 



PLATE VII. 



Sphvroma walked, n. sp. n.s., n.s., curved line indicating natural size of partially rolled specimen figured 

 above in lateral view, crossed lines showing length and breadth of the same specimen unrolled and 

 figured below in dorsal view; a.s., a.i., first and second antennae; l.s., epistome and upper lip; 

 in., m., the mandibles, the palp of one separately figured on the right to display relative length of 

 the first joint; mx. 1, mx. 2, mxp., mxp., first and second maxilhe, and one of the maxillipeds 

 figured from the outer and the inner surface; gn. 1, gn. 2, the first and second gnathopods, with a 

 more enlarged figure of the terminal part of the first; pp. 1, 4, 5, first, fourth and fifth perneopods; 

 g.sp., gastric spines, more highly magnified than the other details, among which the mouth organs 

 are on a higher scale than the antennae and limbs. 



