594 



THE VOYAGE OF H.M.S. CHALLENGER. 



so as to make a long ovate chela, the margins of which are ornamented with several 

 fasciculi of strong and simple hairs. 



The second pair of pereiopoda (fig. 1/) corresponds with the typical form, it is 

 scarcely longer but much more slender than the first, and the chela is small and ovate ; 

 the carpos is twice the length of the propodos and distally as broad, it is divided into 

 three articuli, of which the middle one is the shortest, each of which supports 

 one or two fasciculi of hairs. The three following pairs are robust and longer than 

 the preceding. 



Hippolyte projecta, n. sp. (PI. CV. fig. 3). 



The rostrum is broken just beyond the orbit. Dorsal crest armed with teeth, 

 four of which are present, the posterior being. placed ou the gastric region. A supra- 

 orbital tooth is situated on each side, in a line corresponding with the third tooth 

 from the posterior one, and a slender antennal tooth. The pleon is but slightly 

 elevated at the third somite, which dorsally projects over the fourth ; the sixth equals 

 in length the preceding two, and the telson is subecmal in length with the sixth somite. 



The ophthalmopoda (fig. 3a) are pyriform and furnished with an incomplete ocellus. 



The first pair of antennae (fig. 36) is robust and has the peduncle armed with two 

 teeth on the first joint and one on the upper surface of the second and third joints. 

 The upper flagellum is stout and the lower one slender. 



The second pair of antennae has a scaphocerite that reaches beyond the extremity 

 of the peduncle of the first pair. The flagellum is broken off short. 



The second pair of gnathopoda is robust, fringed with short hairs, and reaches as 

 far as the extremity of the scaphocerite. 



The first pair of pereiopoda is robust and short, the carpos articulating with 

 the propodos at the lower angle. The second pair of pereiopoda is wanting ; the third 

 pair is long and robust ; the meros is armed with three teeth on the lower distal margin. 

 The fourth and fifth pairs are shorter than the preceding, and smooth. 



Habitat. — Station 49, May 20, 1873 ; lat. 43° 3' N., long. 63° 39' W,; south of 

 Halifax, Nova Scotia ; depth, 85 fathoms ; bottom, gravel, stones ; bottom temperature, 

 35°-0. One specimen, male (?). Dredged. 



