34 STALK-EYED CRUSTACEA. 
Stimps.* from Panama and Manzanillo ; and O. stimpsomi Studer,t from near 
Ascension Island, 60 fathoms. The latter species appears to be very simi- 
lar to, if not the same as, O. tuberosa. In the breadth of the carapace 
O. lata shows a closer approach to Hepatus than the more typical species 
of Osachilu do. 
Famity DORIPPID. 
ZETHUSA Rovx. 
Crustacés de la Méditerranée, 4°™° Livr., 18380 [Zthusa]. 
Z&thusa ciliatifrons Fax. 
Plate V., Fig. 3, 3, 3°. 
Bull. Mus. Comp. Zodl., XXIV. 159, 1893. 
Carapace broader than long, branchial regions much inflated ; surface 
granulated on the branchial and cardiac regions, pubescent on the gastric 
region ; front and anterior part of the lateral border ornamented with 
long up-turned cilia. Front between the orbits divided by a triangular 
median sinus and two slightly shallower lateral sinuses into four triangular 
teeth of equal length. The orbital sinuses are very deep, and the external 
orbital angles reach as far forward as the frontal teeth, so that the front 
margin of the carapace, viewed from above or from below, is cut into six 
teeth of equal length. The dorsal surface of the carapace is deeply areo- 
lated; the branchio-cardiac lines are deeply impressed and meet in the 
median line in front of the heart, cutting off the depressed cardiac area from 
the gastric. The gastric region is uneven with pits and furrows. The eyes are 
small, on very short peduncles, just reaching, when extended, to the pos- 
terior angles of the orbital sinuses; the eye is terminal, not wider than the 
peduncles, and is provided with pigment of a black color. The chelipeds are 
equal, small, and slender; the chela is smooth and not more robust than the 
carpus; the fingers are longer than the palm, laterally compressed, curved 
inward, longitudinally grooved, their prehensile edges straight and regularly 
denticulated. The ambulatory limbs are very long (the second considerably 
longer than the first), naked and granulated ; the propodus is slightly shorter 
than the merus, slightly compressed, with a longitudinal groove on each 
side ; the dactylus is one half longer than the propodus, laterally compressed, 
* Ann. Lyc. Nat. Hist. N. Y., X. 114, 1871. 
+ Crustaceen der Gazelle, p. 16, Plate I. Fig. 4: Abhandl. KGnigl. Akad. Wissensch. zu Berlin, 1882. 
