614 



THE VOYAGE OF H.M.S. CHALLENGER. 



The telson is subequally long with the outer plates of the rhipidura. 



The ophthalmopoda are pyriform, and furnished with an ocellus. 



The first pair of antennas has the peduncle subequal with the rostrum, and carries a 

 sharp and slender stylocerite that equals the length of the first joint ; terminal flagella 

 about the same length as the peduncle. 



The second pair of antennas carries a scaphocerite that is broad at the extremity and 

 reaches beyond the apex of the rostrum, and a flagellum that is shorter than the animal. 



The second pair of gnathopoda reaches as far as the extremity of the scaphocerite. 



The first pair of pereiopoda is short and moderately robust, the second pair is long, 

 slender and subequal, and the three posterior pairs terminate in a biunguiculate dactylos. 



Habitat— Station 49 ; lat. 43° 3' N., long. 63° 39' W.; south of Halifax, Nova 

 Scotia; depth, 85 fathoms; bottom, gravel, stones; bottom temperature, 35 o, 0. One 

 specimen ; male. 



Dredged. 



The animal is slender in general form, and has the rostrum straight and in the same 

 horizontal line with the dorsal surface of the carapace, and about two-thirds of its length, 

 measured in the median line from the orbital to the posterior margin. It is armed on 

 the upper margin with six small teeth, of which two are posterior to the orbital margin ; 

 on the lower margin there are three near the distal extremity. The supraorbital and 

 antennal teeth are well developed, but that at the fronto-lateral angle is small. 



The ophthalmopoda are pear-shaped and about half the length of the rostrum. 



The first pair of antennas has the peduncle extending, by the length of the last joint, 

 beyond the extremity of the rostrum ; each joint is armed with a strong tooth and the 

 two flagella are short and unequal. The second pair of antennas is rather longer than the 

 animal, and the scaphocerite reaches beyond the terminal joint of the peduncle. 



The second pair of gnathopoda extends to a point subequal with the scaphocerite. 



The first pair of pereiopoda is short and robust ; the carpos is nearly as long as the 

 propodos ; posteriorly it is narrow and distally as broad as the propodos, and overrides it 

 on the upper margin. The second pair of pereiopoda is long, slender, and has the carpos 

 seven-articulate. 



The pleon does not suddenly narrow at the third somite, which is dorsally arcuate 

 and posteriorly only slightly produced in the median line. 



