REPORT ON THE CRUSTACEA MACRURA. 783 



preceding, and rather shorter than the telson, which is dorsally rounded and gradually 

 tapers to the extremity ; on each side within the margin are three small spinules, and the 

 distal extremity is fringed with a few hairs. 



The ophthalmopoda (fig. 5a) are short and robust; the ophthalmus is but little broader 

 than the stalk, and furnished beyond the margin of the ophthalmus with a minute, round 

 ocellus. In this it differs from the European type of the genus, which has the ocellus 

 enclosed within the margin of the ophthalmus instead of being isolated. 



The first pair of antennae has the basal joint of the peduncle so deeply excavate on the 

 upper surface for the reception of the ophthalmopod, that the appendage is translucent 

 in the centre ; the outer margin is furnished with a sharp-pointed stylocerite that is 

 about half the length of the joint, at the distal extremity of which, on the same side, is 

 another sharp flat point or tooth ; the second and third joints are short, cylindrical, and 

 fringed with fine short hairs, and terminally support two flagella, the inner of which is 

 long and slender, while the outer is stout and flat as far as a point equal to the length 

 of the peduncle, when it divides into two slender branches, the inner being short and 

 rigid, the outer long, slender, flexible, and subequal with the inner flagellum. It is 

 remarkable that neither of the flagella of this pair of antenna? has attached to it any 

 of the membranous cilia so common in the order. 



The second pair of antennae is furnished with a broad scaphocerite that reaches to 

 the extremity of the rostrum, and a slender flagellum that is rather longer than the body 

 of the animal. 



The mandible (fig. 5d) consists of a stout molar process, a separate psaiistoma that 

 is serrate at the extremity with four teeth, of which the two middle ones are the smaller, 

 and on the outer side, at the base, a slender three-jointed synaphipod that does not 

 reach to the length of the psalistoma. 



The second pair of gnathopoda (fig. 5i) is short, not reaching much beyond the 

 ophthalmopoda; it is five-jointed; the coxa supports a small podobranchia, and the 

 basis a short ecphysis ; the three following joints are thickly furred with hairs, the terminal 

 ending in an obtuse point. 



The first pair of pereiopoda is long and slender, the carpos being twice the length of 

 the propodos. The second pair is long and slender, the carpos being nearly as long as 

 the palm of the propodos, and the chela about half the length of the palm. The succeeding 

 three pairs are subequal, and fringed with small hairs ; the carpos is anteriorly produced 

 beyond the near extremity of the propodos, which is cylindrical and terminates in a 

 slightly curved, sharp-pointed dactylos. 



The pleopoda are biramose, the inner distal angle of the basal joint projecting beyond 

 the articulation with the branches. 



The ova attached to the females are small, numerous, and round, and appear to have 

 the embryo generally well advanced in development. 



