STEBBING— ISOPODA 



113 



DAGTYLOKEPON, n. g. 



This genus agrees with Trapezicepon, Bonnier, in having no medio-dorsal bosses on 

 the perseon, but the inner branches of the pleopods in the adult female are long and 

 irregular. Also it differs from that genus in having the lateral bosses of the peraeon 

 small and discontinuous, and in regard to the hind lamina of the head, which, instead of 

 two simple pointed secondary lamellae at each corner, here has those lamellae more or 

 less digitate. 



The generic name compounded of Sct/cruXos, finger, and kepon, alludes in the first 

 part to the digitate processes of the head, which find a parallel in the species Orbione 

 penei, Bonnier. The second portion of the name, based on Kepon, Duvernoy, refers to its 

 close alliance with that genus and with those which have been named with a similar 

 termination by Giard and Bonnier. 



28. Dactylokepon richardsonce, n. sp. (Plate lie.) 



The single specimen for which this species is instituted contained a vast multitude of 

 eggs in the earliest epicaridian stage, but no male could be found. Miss Rathbun's 

 notification that it was found in the left branchial cavity of Trapezia cymodoce (Herbst) 

 suggested an expectation that it would prove to be Trapezicepon amicorum (Giard and 

 Bonnier), but this was negatived by the characters mentioned for the genus. The 

 present species is much larger than that just named, having a length of 6 mm. instead of 

 3 mm., and it was taken, not at the Friendly Isles, but the Seychelles. 



The anterior lamina of the head is unusually narrowed forward, but as this part 

 of the organism is very soft, its shape might easily be altered by accidental circumstances 

 of pressure in the branchial cavity of the host. The leading characteristic of the species 

 is the strongly digitate form of the outer lamella in the hind lamina of the head. The 

 inner lamella is also somewhat digitate. The maxilliped has the narrow curved extremity 

 following an emargination, in agreement with Bonnier's description and figure of the 

 maxilliped in T. amicorum. The side-plates of the pleon, the outer branches of the 

 pleopods and the uropods are all long and digitate as in that species, but the uropods are 

 decidedly narrower. The inner branches of the pleopods could not be at all clearly made 

 out in the confusing mass of digitations to which they lie closely adpressed. 



The species is named out of respect to Miss Harriet Richardson, who has done so 

 much valuable work in this and other groups of the Isopoda. 



29. Dactylokepon catoptri, n. sp. (Plate 10 b.) 



The present small species agrees with the preceding species in the generic characters, 

 but the outer lamella of the cephalic lamina is poorly instead of strongly digitate. The 

 maxillipeds have the palp-like apical process more produced and narrower than in the 

 preceding species. It has three minute setules on the apex. The second joint of the 

 fifth peraeopod is without excrescences of the front margin. 



Length of specimen about 3 mm. 



Locality. Extracted from the left branchial cavity of Catoptrus nitidus, A. Milne- 

 Edwards, $, as identified by Miss M. J. Rathbun. Taken at Amirante, from a depth ot 

 SECOND SERIES— ZOOLOGY, VOL. XIV. 15 



