REPORT ON THE CRUSTACEA MACRURA. 763 



coxal plate of the first somite elevated to a strong rib, inferior margin smooth and 

 rounded. 



Telson slightly longer than the lateral plates of the rhipidura. 



Ophthalmopoda short, pyriform, and furnished with a small circular ocellus. 



First pair of antennae having the stylocerite reduced to a small tooth. 



Second pair of antennae having the scaphocerite subequal in length with the rostrum, 

 sharp pointed, and serrate on the outer margin ; flagellum about half the length of the 

 animal. 



Habitat— Station 196, October 13, 1874 ; lat. 0° 48' 30" S., long. 126° 58' 30" E.; 

 near the Philippine Islands ; depth, 825 fathoms ; bottom, hard ground ; bottom 

 temperature, 3 6° "9. One specimen, female, laden with ova. Trawled. 



Station 220, March 11, 1875; lat. 0° 42' S., long. 147° 0' E.; north of New 

 Guinea; depth, 1100 fathoms; bottom, Globigerina ooze; bottom temperature, 

 36°*2. One specimen, female, laden with ova. Trawled. 



This species was described by Milne-Edwards from specimens brought home by 

 Quoy and Gaimard from New Guinea, but there are several points in it to which the 

 author has not drawn attention, and which are of interest, and, so far as I am aware, 

 peculiar to this form. 



All the specimens in the collection are extremely compressed, and the sides deep and 

 flattened, although Milne-Edwards says that " Le corps n'est pas comprime." The 

 rostrum is produced oblicpuely upwards, and is sharp and styliform, and armed on both 

 upper and under surfaces with several small teeth, of which those on the lower side are 

 the more important. The anterior margin corresponding with the outer canthus of the 

 orbit is pointed and curved inwards ; the tooth that corresponds with the second pair of 

 antennas is long, spinous, and directed anteriorly, while that at the fronto-lateral angle 

 is directed forwards and outwards ; from this point to the posterior angle the inferior 

 margin is abruptly bent inwards, forming a longitudinal ridge that is anteriorly 

 confluent with the fronto-lateral tooth, and posteriorly with the tooth at the posterior 

 angle of the carapace. But the most remarkable feature of the carapace is a lateral 

 process on the posterior margin that projects and lies beneath a corresponding process of 

 the anterior margin of the first somite of the pleon, and bolts down the carapace so 

 securely that it is difficult to elevate it. On each side of the dorsal carina corresponding 



