C. Spence Bate on the Penceerdea. 191 
pereion crenated, fifth produced to a small tooth in the dorsal 
median line. Pleopoda very long. 
Length 8 inches (female). 
Taken in mid Pacific at a depth of 2600 fathoms. 
Benthesicymus altus, nu. sp. 
Rostrum pointed, crest armed with two teeth. Dorsal 
surface smooth. Ophthalmopodas long as the rostrum. Hye 
small. Flagella of first pair of antennez half as long as the 
animal. | 
Length about 3 inches. 
Taken several times between Australia and Japan, between 
300 and 1400 fathoms. 
Benthesicymus brasiliensis, n. sp. 
Rostrum pointed, crest armed with two small points. 
Third somite of the pleon dorsally terminating in the median 
line with a small laterally compressed tooth ; fourth and fifth 
somites carinate and terminating in a smaller tooth; sixth 
carinate. Telson long and narrow, but not so long as the 
lateral plates of the rhipidura. 
Length about 5 inches. 
Taken several times in the Atlantic and Pacific oceans, 
the finest specimens occurring off Brazil at 1100 to 2440 
fathoms. 
Benthesicymus wridescens, n. sp. 
Rostrum short, not more than half the length of the oph- 
thalmopod; crest armed with one small tooth. 
Length about 4 inches. 
Taken in South Atlantic, near the island of Tristan 
d’Acunha, in 1900 fathoms of water. 
Genus GENNADAS, 0. g. 
Like Benthesicymus, but much smaller ; peduncle of the 
first pair of antenne longer and stouter; the dactylus of the 
second pair of gnathopoda is spatuliform, instead of being 
cylindrical and sharp; and the first pair of pereiopoda is 
shorter and, compared with the others, more robust. ‘The 
structure of the branchiz is also modified. 
This genus approximates nearer than any other to the little 
erustacean named Pencus (Kolga) speciosus in Salter and 
Woodward’s map of fossil Crustacea; hence the generic 
name (from yevvadas, of a noble race). 
