320 Proceedings of the Royal Physical Society. 



Maxillae similar in structure to those of the genus mentioned. 



The first and second maxillipeds are also similar to those 

 of the same species. 



The first pair of thoracic feet resemble those of Idomene, 

 but the first joint of the inner branch is not nearly so robust, 

 and the terminal setae of the end joint are not so strongly 

 clawed. 



The second, third, and fourth pairs in the female are 

 similar to those of Idomene, but the second pair in the male 

 has the inner branch armed witli a strong claw-like spine. 



The fifth pair comparatively small, lamelliform, and the 

 primary and secondary joints are sub-equal, and only moder- 

 ately developed (cf. Twelfth Annual Report Fishery Board 

 for Scotland, pt. iii. p. 255, pi. Ix. fig. 19, etc.). 



Furcal joints short. One ovisac. 



The differences that separate this genus from Idomene are 

 comparatively small ; but in the following two species, which 

 I have ascribed to it, the armature of the mandible-pulp, and 

 the structure of the inner branch of the first pair of thoracic 

 feet, preclude them from a place in Philippi's genus. 



93. Idomenella rostrata, T. Scott. 



1893. Daclylopus rostratus, T. Scott, Eleventh F. B. Kept., pt. iii, 

 p. 205, pi. iii. figs. 7-20. 



Hah. — The specimens from which this species was described 

 were obtained by carefully washing shells inhabited by the 

 common hermit crab, Eupagurns, Bernhardus, which were 

 dredged off the west side of Inchkeith. 



94. Idomenella coronata, T. Scott. 



1894. Dactylopus coronatus, T. Scott, Twelfth F. B. Kept., pt. iii. 

 p. 255, pi. ix. figs. 12-20. 



Hob. — Dredged near the Bass Eock and also in Largo Bay ; 

 not common. It has also been obtained very sparingly off 

 Musselburgh, and at the north end of Inchkeith. 



