EEPORT ON THE CRUSTACEA MACRURA. 



Gil 



features that associate it with the genus Spirontocaris, and in others it has characters 

 that correspond with those of Ilippohjte. 



Like Hippolyte, as restricted to correspond to Leach's type, it has a horizontal 

 rostrum, one supraorbital and one antennal tooth, and the first pair of pereiopoda has a 

 slight tendency to have the propodal extremity of the carpos elevated and cup-like. 



Like Spirontocaris it has three teeth on the lower margin of the rostrum, and carries 

 a small tooth at the distal extremity of each joint of the first pair of antennae. The 

 mandible carries a two-jointed synaphipod. The second pair of pereiopoda has the 

 carpos seven-articulate, and the three anterior pairs of pereiopoda carry a rudimentary 

 mastigobranchial appendage. It differs from both Hippolyte and Spirontoca/ris in having 

 no appendage attached to the basis of the second pair of gnathopoda ; and in having no 

 teeth on the ventral surface of the pereion. 



Stimpson's species of Hippolyte rectirostris, from the north of Japan, corresponds 

 closely with, and probably belongs to this genus. 



Hetairus gaimardii (Milne-Edwards) (PI. CIX. fig. 2). 



Hippolyte gaimardii, Milne-Edwards, Hist. Nat. Crust., torn. ii. p. 378. 



" Eostrum straight, commencing near the middle of the carapace, very slightly 

 elevated, and extending nearly as far as the extremity of the scaphocerite, slightly 

 enlarged below, and armed above with six widely spaced teeth, of which three are on 

 the carapace ; three teeth upon the inferior margin. Scaphocerite long and oval, 

 reaching far beyond the second pair of gnathopoda, of which the last joint is styliform. 

 Pereiopoda as in Sowerby's Hippolyte (Spirontocaris spinus). Third somite of the pleon 

 less strongly toothed; four pairs of spines on the telson. Length about 18 lines." — 

 (Milne-Edwards.) 



Anteriorly robust ; posteriorly slender. Eostrum armed on the upper margin with 

 six teeth, and on the lower near the apical extremity with three. 



Habitat.— Station 49; lat. 43° 3' N., long. 63° 39' W.; south of Halifax, Nova 

 Scotia; depth, 85 fathoms; bottom, gravel, stones; bottom temperature, 35°. One 

 specimen ; female. 



Dredged. 



