74 Mr. H. D. Goodsir on some Animals 



with punctured Imes ruuning almost parallel to one another. 

 Ambulatory legs of considerable length ; the anterior pair large, 

 the arm extending beyond the lateral edge of the carapace, and 

 haAdng its internal edge veiy much depressed and thinned, at the 

 anterior angle of which are several strong spines ; the remaining 

 legs are all depressed, ^^^th the edges of the last three joints 

 armed with long, thick-set hairs, and especially the superior 

 edges. The internal antennse consist of four segments, the last 

 being multiarticulate, and a strong articulated spine arises from 

 the internal edge of the third articulation near its distal extre- 

 mity. The external pair* of antennae arise from the internal 

 angles of the orbit, are multiarticulate and very minute. Tlie ex- 

 ternal foot-jaws are large, but have their internal edges so formed 

 as to leave a lozenge-shaped space between them. The abdo- 

 men in the male of this species is narrow and of a triangular 

 shape ; that of the female large, rounded, and covering almost all 

 the lower sm-face of the body. It appears to have been found in 

 great numbers both by Mr. Williams and Mr. Melville. 



2. Hijjpolyte ensifenis. PI. VII. fig. 2. 



H. with one short tooth projecting forwards from the base 

 of the rostrum; rostrum slightly cm-ved upward with four or 

 five spines at the tip, the third of which from the dorsum is 

 longest. Peduncular scale of external antennae not so long as 

 the rostrum almost by one-third. External foot -jaws not so long 

 as the peduncle of the external antennse ; with the terminal joint 

 flattened, serrated at the apex and on its internal edge. 



Description. — The whole animal about 1 inch in length, of an 

 ochrey yellow colour except the tips of the eyes, which are black. 

 The internal antennse with the peduncle 3-jointed; the scale of 

 the external pair very thin and narrowed at the tip, which is also 

 bifurcated. The external foot-jaws have the external edge of the 

 last joint smooth and rather thickened. The first pair of thoracic 

 legs are short, thick, smooth and didactyle ; those of the second 

 pan' are long, filiform, spined, and also didactyle ; the third arti- 

 cidation is very slender. The last three pairs of legs are much 

 longer than any of the preceding, filiform and spined. The mid- 

 dle plate of the tail not so long as the second, armed with two 

 pairs of spines at the tip. 



Found in considerable abundance between the parallels of 25° 

 and 30° north, and 4° west long., by I\Ir. Williams. Almost every 

 specimen infested with Bopyrus squillarum. 



3. Palcemon natator. PI. Vtl. fig. 3. 



P. vA\\\ the rostrum lanceform, having eleven or twelve large 

 distinct spines on its superior edge, and two small rather indi- 



