1018 THE VOYAGE OF H.M.S. CHALLENGER. 



Telson longer than broad, rather longer than the peduncles of the third uropods, cleft 

 almost or quite to the base, apically a little dehiscent, about a quarter of its length from 

 the apex, each division forming a little tooth on the inner margin with a spine in the 

 cavity between the tooth and the continuation of the margin ; the apical part of each 

 division has four serrate points, not symmetrically arranged, being in one lamina all on 

 the outer margin, in the other distributed, two on the outer, one on the inner, in each 

 case the apex being the fourth. 



Length. — The specimen, in the position figured, measured, without the antennae, half 

 an inch. 



Locality. — Station 142, off Cape Agulhas, December 18, 1873; lat. 35° 4' S., long. 

 18° 37' E.; depth, 150 fathoms; bottom, green sand; bottom temperature, 47°. One 

 specimen. 



Remark. — The specific name is given out of respect to the eminent carcinologist, 

 Bruzelius. 



Genus Elasmopus, Costa, 1853. 



1853. Elas 

 1857. 

 1870. 

 1876. 



1882. 



nopus, Costa, Bend, della Soc. r. Borb. 



Costa, Bicerche sui Crost. Amf. Nap., pp. 175, 212. 



Boeck, Crust, amph. bor. et arct., p. 132. 



Boeck, De Skand. og Arkt. Amph., p. 392. 



Sars, Oversigt af Norges Crustaceer, p. 28. 

 1885. Podocerus {jiars), Cams, Prodronius Fauna? Mediterranean, p. 395. 

 1887. Elasmopus, Cbevreux, Catal. Crust. Amph. Bretagne, p. 20. 



Mandibles with the third joint of the palp larger than the second. 



First Maxillse with seven spines on the apical border of the outer plate. 



Second Maxillse having the inner plate ovate, with setae at the apex. 



Upper Antennse longer than the lower, with elongate peduncles. 



Second Gnathopods larger than the first. 



Third, Fourth, and Fifth Peneopods broad. 



Third Uropods with broad, subequal, not very elongate, rami. 



Telson deeply cleft. 



For Costa's original definition, see Note on Costa, 1857 (p. 298). The present definition 

 is altered from Boeck, who speaks of the third joint of the mandibular palp as being much 

 greater than the second, curved, very setose ; the third uropods he defines as having 

 rami equal in length, short and broad, and the telson as very large, very deeply cleft ; 

 but in Costa's type species the telson is not very large, nor is it in Mr. Haswcll's species, 

 Megamcera subcarinata ; therefore the epithet seemed unsuitable. Boeck is no doubt 

 right in supposing that Megamasra brevicaudata, Sp. Bate, should be included in this 

 genus, and in that species also the telson is small. The number of spines on the inner 



