REPORT ON THE CRUSTACEA MACRURA. 303 



Hemipenseus speciosus, Spence Bate (PI. XXXVII. fig. 3 ; PI. XLIV. fig. 3). 



Hemipenxus speciosus, Sp. B., loc. cit, p. 186. 



Carapace dorsally carinated from the anterior to the posterior margin, and produced 

 to a sharp anteriorly depressed rostrum that is armed with three teeth, one of which is 

 immediately behind the orbital margin. 



Ophthalmopod long, slender, transversely compressed and hairy; the ophthalmus 

 scarcely broader than the stalk, which carries on the upper and inner surface a small but 

 prominent tubercle. Body smooth. Pleon having the posterior half of the third somite 

 elevated to a small carina, which is repeated at the posterior extremity of the fourth and 

 continued on the fifth and sixth, where it terminates abruptly. 



Telson about half the length of the outer ramus of the rhipidura, and furnished near 

 the apex on each side with three small spinules. 



Length, about 63 mm. (2"5 in.) 



Habitat— Station 325, March 2, 1876; lat. 36° 44' S., long. 46° 16' W., east of 

 Buenos Ayres ; depth, 2650 fathoms ; bottom, blue mud ; bottom temperature, 32°"7. 

 Two specimens ; one male and one female. Trawled. 



This species bears some resemblance to Hemipenseus spinidorsalis, but the rostrum is 

 sharper and more depressed anteriorly, and the last somite of the pleon is not produced 

 posteriorly to a small toothdike process. The ophthalmopod is slender, the eye is small, 

 and the posterior two pairs of pereiopoda are rather more slender. 



One of our specimens appears to be a male not yet well developed, and the other a 

 female. They both have on the ventral surface a broad, smooth plate that occupies the 

 entire space between the posterior pairs of pereiopoda, which is produced to a sharp point 

 in the median line anteriorly. 



Hemipenseus virilis, Spence Bate (PI. XLIV. fig. 4). 



Hemipenxus virilis, Sp. B., lac. cit, p. 187. 



Rostrum horizontal, pointed, smooth and cdiated on the lower margin, armed with 

 three teeth on the upper surface, one of which is slightly posterior to the orbital margin ; 

 carina lost at the gastric region. Dorsal surface smooth ; regions not clearly defined. 

 Pleon dorsally compressed ; a small carina commences at the fourth somite and terminates 

 posteriorly in a small tooth on each of the last three somites. 



Telson half the length of the rhipidura, pointed, dorsally flattened, and grooved in the 

 median line, laterally fringed with hairs, and four small spines. 



Length (male), 100 mm. (4 in.) 



