REPORT ON THE CRUSTACEA MACRURA. 



G23 



joint is shorter, being but little longer than the propodos, and the dactylos also differs in 

 form. The branchial apparatus, so characteristic of that genus, is also similar. 



•The antennae have the terminal flagella, especially those of the first pair, short. 



There is also a resemblance to Merhippolyte in the long and curved carpos of the 

 second pair of pereiopoda. So great is this resemblance that it was only after a very 

 close inspection and the action of a reagent that I became convinced of its multiarticulate 

 condition. 



This genus is at present represented by only one species, and unfortunately there is 

 only a solitary specimen in the collection. 



Amphiplectus depressus, n. sp. (PI. CX. fig. 3). 



Carapace short, dorsally depressed on the gastric region, anteriorly produced to a 

 rostrum that is nearly as long as the dorsal surface, and crested on the frontal region 

 with numerous small teeth, whence it is smooth to the apex, which is forked ; the under 

 surface is armed with five or six small teeth near the base. 



The first pair of antennas is short and slender. 



The second pair is about half as long as the animal, and carries a scaphocerite that 

 reaches as far as the extremity of the rostrum. 



The first two pairs of pereiopoda are chelate, slender, and unequal in length, the first 

 being short and chelate, the second long and minutely chelate. The posterior three pairs 

 are short, and stronger than the preceding. 



Habitat.— Station 122, September 10, 1873; lat. 9° 5' &, long. 34° 50' W.; off 

 Pernambuco ; depth, 350 fathoms ; bottom, red mud. One specimen, female. 

 Trawled. 



The carapace is short, rather less than one-fourth the length of the animal; the 

 dorsal surface is depressed over the gastric region, and anteriorly produced to a slender 



