Mr. C. Spence Bate on a new Genus of Macrura. 61) 



broad and furnished on the outer side with a wide and sharp- 

 pointed stjlocerite, which is of great tenuity and free from 

 cilia, whereas the inner side of the shaft of the appendage is 

 fringed with a few simple cilia. The second joint is about 

 half the length of the first and more free from cilia, there 

 being only three or four on the inner margin. The third 

 joint is very short, but nearly as broad as the preceding, and 

 is furnished with a bundle of long hairs on the inner distal 

 angle ; it supports two short flagella, of which the outer 

 is the shorter, and carries towards its distal extremity a 

 series of membranous cilia. The inner flagellum is sub- 

 equally robust with the outer one, but free from cilia of any 

 kind. 



The second pair of antennas (c) are furnished with a long 

 ovate scaphocerite, the outer margin of which is rigid, and at 

 the distal extremity, where a small tooth generally exists, the 

 rudiment only of one is seen ; the squamose portion is of 

 extreme tenuity and projects distally beyond the rigid margin, 

 and is fringed with numerous fine ciliated hairs ; on the inner 

 side of the scaphocerite is another joint that is short and 

 robust, from the distal extremity of which projects a long and 

 slender flagellum that is somewhat rigid and gradually tapers 

 to its extremity. 



The mandible {d) consists of a smooth and pointed psali- 

 stoma which is in continuity with the slightly projecting molar 

 process, having on the anterior margin a short three-jointed 

 synaphipod, the two distal joints of which are fringed with a 

 few strong hairs. 



The first siagonopod (e) is three-jointed and three-branched : 

 the first joint is short, robust, and produced on the inner side 

 into a large flattened process fringed with hairs : the second 

 joint is narrower than the first, but not much longer ; it has 

 its distal extremity, which is broad and oblique, fringed with 

 short, stiff, tooth-like spines ; on its outer mai-gin a small 

 uniarticulate branch exists, which is adorned with two slender 

 and rather long hairs at the distal extremity. 



The second siagonopod (/) is of five branches, all of which 

 are foliaceous and of extreme tenuity, and are unibranched, 

 excepting the second, which is biramose ; the fourth branch is 

 shorter than the others, narrow, and sharp-pointed ; while the 

 fifth or outer one is broad and long, being equal in size to the 

 three on the inner side ; it is also pointed anteriorly and broad 

 posteriorly, and represents homologically the mastigobrauchial 

 appendage, just as the fourth joint represents the continuation 

 of the theoretical limb. The first three or inner branches are 



