REPORT ON THE CRUSTACEA MACRURA. 847 



Station 245, June 30, 1875; lat. 36° 23' N., long. 174° 31' E.; North Pacific; 

 depth, 2775 fathoms. Taken in a tow-net sent down to over 1700 fathoms. 



This species shows the development of the rostrum more after the manner of the 

 normal Phyllobrauehiata than do the other described species, and exhibits the direction in 

 which generic relationship exists. This species differs little in structural character from 

 Acanthephyra, except in the soft and membranous condition of the dermal tissues, the 

 shortness of the rostrum, which in this genus never reaches beyond the first joint of the 

 first pair of antennas, the absence of the ocellus, and the length of the propodos of 

 the posterior pair of pereiopoda. 



The ophthalmopoda in this species are short and broad, being nearly as broad as 

 long, scarcely compressed, and the ophthalmus is brown in colour. 



The first pair of antennas has the first joint of the peduncle deeply excavate, more so 

 than is usual in this genus ; the distal outer angle is produced to a process, and the 

 stylocerite is stout, sharply pointed, and about half the length of the joint. 



Most of the appendages are broken off and lost, but the chelate pereiopoda and the 

 posterior pair are present and exhibit the features common to the genus. 



The first pair of pleopoda has the inner ramus developed as a small foliaceous plate, 

 and the others carry a long and slender stylamblys. 



Hymcnodora glauca, n. sp. (PI. CXXXVII. fig. 1). 



Dermal structure soft, flexible and smooth, carapace slightly compressed over the 

 frontal region to a median ridge, which is furnished with three or four minute denticles ; 

 anteriorly the carapace projects as far as the extremities of the ophthalmopoda in a 

 rounded margin, the central point of which is furnished with a small sharp denticle, 

 beneath which is a second of nearly equal importance. 



The pleon is smooth and laterally compressed, the sixth somite being about twice the 

 length of the preceding and subequal with the telson, which is long, narrow and tapering, 

 having the lateral margins depressed, and the dorsal surface flattened. 



The ophthalmopoda are short, horizontally flattened, broader at the base than at the 

 distal extremity, near which on the inner side, in close proximity to the ophthalmus, is 

 a small but conspicuous tubercle. 



The first pair of antennae has the peduncle about one-third the length of the 

 carapace ; it is stout and has the first joint slightly depressed to receive the ophthalmo- 

 poda, and the stylocerite exists as a bluntly pointed vertical wall on the outer side ; 

 the second and third joints are short and cylindrical, and support two flagella, of which 

 the outer is the more robust and is enlarged at the base, on the under surface of which 

 is a thick brush of membranous cilia, the inner flagellum is slender and filiform through- 

 out, and both are subequal with the length of the carapace. 



