REPORT ON THE CRUSTACEA MACRURA. 019 



The first pair of antennae carries two flagella. 



The second pair of antennae has a round, pointed scaphocerite armed with a tooth on 

 the outer margin and carries a long flagellum. 



The mandibles have a small psalistoma and a three-jointed synaphipod, distinct from 

 the molar process. 



The first pair of pereiopoda is chelate and has the carpos continuous with the 

 propodos. The second pair of pereiopoda is long, slender, minutely chelate, and has the 

 carpos multiarticulate. The three posterior pairs of pereiopoda are simple and well 

 developed. 



The pleon has the third somite dorsally arcuate and slightly produced posteriorly. 



The telson is tapering and dorsally furnished with two or three lateral pairs of solitary 

 spinules. 



The branchial plumes are more numerous in this genus than in Spirontocaris, there 

 being five pairs of arthrobranehiae in addition to the pleurobranchiae, as shown in the 

 annexed table, which represents the condition in Merhippolyte agulhasensis. 



Pleurobranchiae, . . . ...111111 



Arthrobranehiae, . . . ...1 1 1 1 1 



Podobranchiae, . . . 1 



Mastigobranchia;, . . . lrrrrr... 



h i k 1 m n o 



It is an interesting and instructive feature in this genus that so great a variation in 

 the character of the branchiae exists with such small external change. 



Geograp>hical Distribution. — The typical species Merhippolyte agulhasensis was first 

 taken on the Agulhas Bank, which lies between the Southern Indian and Atlantic 

 Oceans, about 100 miles south of the Cape of Good Hope. A second species, 

 Merhippolyte orientalis, was found near the Arrou Islands, south of New Guinea. 



Merhippolyte agulhasensis, n. sp. (PI. CX. fig. 4). 



Carapace having the dorsal surface anteriorly projected to a slender rostrum, that is 

 nearly as long as the carapace ; armed on the upper margin with five teeth, the most 

 posterior standing on the gastric region and the anterior near the middle of the rostrum, 

 and on the lower margin with five smaller teeth, remote from one another. 



Pleon smooth. Telson tapering. 



Ophthalmopoda pyriform. 



First pair of antennae with both flagella about as long as the animal. 



Second pair of antennas with flagellum longer than the animal, having the scaphocerite 

 as long as the rostrum. 



