126 MESSES. NORMAN AND STBBBING ON THE 



Genus 3. Anthelura. 



1. Antheluka elongata (Norman). (Plate XXV. figs, i., n.) 

 Paranthura elongata, Norman, MS. in Proc. Eoy. Soc. No. 125, p. 157. 



Head with the sides rather rounded. Second segment of peraeon narrowed, but not 

 greatly constricted behind ; the four following segments of nearly equal width, smooth ; 

 last fully half the length of penultimate, which latter is much shorter than the fifth. 

 Pleon (fig. II. pi., 2 ) with all the segments well defined ; length of pleon, exclusive of 

 telson, equal to that of the two last peraeon-segments. Antennae (fig. n. c, 2 ) having the 

 peduncles of both pairs flattened ; last joint of peduncle of inferior antennae not larger 

 than the inner margin of the third joint; second joint triangular, its inner margin 

 straight and touching the corresponding part of the opposite limb ; flagella of both 

 pairs many-jointed. 



First gnathopods (fig. I. gn 1 and gn 1 *) not strong; hand not large, pyriform, attached 

 by half its underside (not by its base) to the upper face of the triangular wrist, the 

 infero-distal extremity of which stretches forward to receive it ; palm occupying the 

 whole of the unattached portion of the margin of the hand, but, from the peculiar 

 mode of attachment of that joint, only equal to half of its total length, having a few 

 scattered setse ; finger slender, much longer than the palm, and impinging, when closed, 

 upon the wrist ; meros very short, but greatly produced on the back into a sheath-like 

 process, which is strongly angled above and distally hollowed to receive the rounded 

 free base of the hand. 



Second gnathopods (fig. I. gn 2 ) and first peraeopods (fig. i.prp 1 ) resembling in general 

 character the first gnathopod, but smaller, and the back of the sheath-formed meros 

 rounded and not angled. Eemaining peraeopods having all their joints broad and 

 flattened ; hand and nail subequal (fig. i. prf), and only slightly longer than the 

 wrist, the four last joints being subequal in length, hand having two and the wrist three 

 to five long subequal spines on the front margin. 



TJropods (fig. ii. pi., 2 ) with the outer branch arching over the telson, its margin 

 crenated ; inner branch scarcely longer than the telson, broadly rounded at the extre- 

 mity ; the second joint at least as long as the basal portion ; margins plain. Telson 

 narrowly linguiform, and rounded at the extremity. 



The male has the upper antennae (fig. I. c, d ) greatly developed, as long as the four 

 first segments of the body ; the flagellum remarkably thick, and looking out of all 

 proportion to the peduncle which supports it, composed of very numerous short joints, 

 which are densely ciliated, so that the entire member forms a long brush. All the legs 

 are more elongated and slender than the corresponding parts in the female, though in 

 general structure closely resembling them. The first pleopods (fig. i. pi. L, <s ) are fringed 

 with long and beautifully plumose setae, and do not close so tightly over the more 



