REPORT ON THE CRUSTACEA MACRURA. 827 



Second pair of gnathopoda reaching slightly beyond the extremity of the scapho- 

 cerite, and terminating in a sharp oblique point. 



First pair of pereiopoda slightly broader than the second. Third and fourth pairs 

 having the propodos long, slender, and cylindrical, and the dactylos long and styliform. 

 Fifth pair shorter than the preceding, and formed on the same plan, but terminating 

 in a short, almost immature, dactylos, that is hidden in a brush of hairs. 



The pleopoda are flat, narrow, and pointed. 



Habitat— Station 198, October 20, 1874 ; lat. 2° 55' N., long. 124° 53' E; south of 

 the Philippine Islands; depth, 2150 fathoms; bottom, blue mud ; bottom temperature, 

 38°'9. One specimen ; female. Trawled. 



The carapace has a dorsal carina and is suddenly elevated from the base of the rostrum, 

 especially over the frontal region ; the rostrum is slender and narrow, not reaching so 

 far as the extremity of the scaphocerite, and furnished on the lower margin with seven or 

 eight minute teeth, and on the upper surface with a considerable number of still smaller 

 teeth, which extend from the apex to the posterior margin of the carapace. From the 

 upper margin of the rostrum a small ridge extends on each side and is lost at a point 

 about halfway between the orbit and the dorsal carina. From the lower margin of the 

 rostrum another ridge passes backwards and outwards, and terminates between the orbit 

 and just above the anterior extremity of the orbital carina, but is not confluent with it. 

 The orbital carina commences immediately behind the ophthalmopod where it is con- 

 tinuous with the inferior and outer margin of the orbit, forming a notch between it and 

 the upper or inner margin ; from its commencement the ridge continues horizontally in 

 a line along the upper margin of the branchial region to the posterior margin of the 

 carapace. Corresponding with a depression of the hepatic region is au oblique transverse 

 ridge — a line of muscular attachment that connects the cephalon with the pereion — which 

 extends from the orbital and connects it with the outer antennal carina. The latter 

 ridge commences in a prominent style-like tooth on the outer side of the second pair of 

 antennae, and terminates in the posterior margin of the carapace, forming a line parallel 

 with the orbital carina. An intermediate carina between the orbital and outer antennal 

 commences at the posterior margin, close to the termination of the orbital carina, but not 

 confluent with it, and may conveniently be termed a semicarina ; it proceeds downwards 

 and then forwards in a line parallel with it until within a short distance of the transverse 



