REPORT ON THE CRUSTACEA MACRURA. 



835 



mastigobranchia; in Tropiocai-is are rather large, and project further between the 

 branchial plumes ; their arrangement is shown in the following table : — 



Pleurobranchite, 

 Arthrobranchise, 

 Podobranchias, 



Mastigobranehiae, 



Geographical Distribution. — Our typical species was found about twelve degrees 

 south of Japan, and Tropiocaris tenuipes at the western entrance of Torres Strait. 



Tropiocaris planipes, n. sp. (PL CXXXVI. fig. 1). 



Dorsal surface of the carapace horizontally straight, subcarinated, produced to a 

 laterally compressed rostrum ecpaal with the first joint of the first pair of antennae. 



Pleon compressed, not carinated, third somite posteriorly projecting in the dorsal 

 median line as a depressed tooth ; all the other somites smooth. 



Ophthalmopoda short and stout, having no tubercle on the inner surface ; ophthalmus 

 larger in diameter than the stalk, black in colour. 



First antenna? having the peduncle short and deeply excavate ; the outer flagellum 

 stout and the inner slender. 



Second pair of antennas having the scaphocerite longer than the peduncle of the first 

 pair. 



Second pair of gnathopoda reaching as far as the extremity of the scaphocerite. 



Pereiopoda all having the meros and ischium laterally compressed and broadly dilated. 



Telson long, slender, and tapering, the sides being fringed with a row of numerous 

 fine teeth. 



Habitat. —Station 230, April 5, 1875; lat, 26° 29' N., long. 137° 57' E.; depth, 

 2425 fathoms; bottom, red clay; bottom temperature, 35° - 5. One specimen, female. 

 Trawled. 



The dorsal surface of the carapace is carinated anteriorly and horizontally produced to 

 a laterally compressed rostrum, which is slightly elevated anteriorly, and terminates in a 



