358 KEV. T. E. R. STEBBING ON NEW SPECIES OF AMPHIPODOUS 



approach, as well as from all other known species of the genus, it is distinguished by 



the proportions of the third perjeopods, which are unique in having the second joint 



longer than all the remainder of the limb. The specific name, from the Greek oiSelv, to 



swell, and Kap-n-nc, wrist, refers to the wrist or fifth joint of the first perseopods, which is 



more tumid than usual, though in this genus it is normally glandular. Dr. Bovallius has 



noticed that in species of Rliahdosoma the females sometimes have the fourth and fifth 



joints of the first and three following perseopods " inflated and almost egg-shaped, 



owing to a strongly developed glandular mass surrounding the axis of the joint for the 



whole of its length." He supposes the development of these powerful glands to be 



periodical, and " to have some connection with the fixation of the eggs on the underside 



of the body." He had seen full-grown females of some species without the joints 



inflated at all, but had never seen females of the same species with eggs or young ones 



which had not at the same time those joints more or less inflated. He therefore 



deems it " probable that the development of these glands may be connected with the 



maternal functions of the animal." In the present species of Scina this glandular 



development occurs, it will be observed, in a male specimen. 



Scina eattkayi, n. sp. (Plate LIII. A.) 



The head is broad, dorsally smooth, with the front margin between the antennae 

 faintly concave or perhaps straight. The segments of the perseon are broad, except 

 the last two. The first four segments of the pleon are rather long, each subequal in 

 length to the coalesced fifth and sixth segments, of which the part furnished by the 

 fifth is abruptly narrower than the fifth. The telson is small and tongue-shaped. The 

 length of the body from the front of the head to the end of the perseon is the same as 

 that of the outstretched pleon to the end of the telson. 



The eyes are minute, situated at the anterior corners of the head. 



The first antennae are nearly equal in length to the head and pleon. They are set 

 wide apart. The first joint of the flagellum carries numerous filaments; the small 

 and slender second joint is tipped with a long fine seta. 



The second antennse of the specimen are short, two-jointed. 



The first gnathopods have the second joint equal in length to the three following- 

 together, and broader than the corresponding joint in any of the other limbs. The 

 fourth joint has some minute prickles on the hind margin, and a long spine and a short 

 one at its apex ; the fifth is considerably longer and broader than the sixth, and is 

 armed with numeruus setae or seta-like spines on the distal half of the front margin 

 and along the hind margin, which carries a rigid spine near its apex ; the sixth joint is 

 straight and narrow, with flexible spines on both margins and on the surface. The 

 needle-like finger is about half the length of the preceding joint. 



The second gnathopods have a few spines but no prickles on the hind margin of 

 the fourth joint, the fifth joint considerably shorter and very little broader than 



