ZETHUSA LATA. 35 
slightly curved, longitudinally grooved and ribbed, the upper edge very sharp. 
The last two pairs of limbs are of about an equal length, not reaching beyond 
the distal end of the merus of the second pair of ambulatory appendages, 
pubescent excepting the nail which tips their dactyli; their propodi are 
much shorter than the merus and not much longer than the carpus; dactyli 
very short and strongly curved. The sternum is rather coarsely granulate. 
Conspicuous red transverse bands adorn the chelipeds and first two pairs of 
ambulatory appendages ; there are two of these bands on the merus, one on 
the carpus, one on the propodus, and one on the dactylus. 
Dimensions of a male: length of carapace, 26.5 mm.; breadth of cara- 
pace, 29.5 mm.; breadth of anterior margin between external orbital 
teeth, 12 mm.; length of second ambulatory appendages, 74.5 mm. (merus, 
12 mm.; propodus, 15.5 mm.; dactylus, 22 mm.). 
Station 3389. 210 fathoms. 5 males, 2 fem. 
33 3391. 153 ce 2 males. 
ke 3396. 259 oe 1 male. 
so 808i. 27 ss 1 male juv. 
In young small specimens the carapace is not so broad as in the adult (in 
fact the length of the carapace may be equal to its breadth), the antero- 
lateral angles do not project so far forward, and the gastric area is not so 
deeply sunken beneath the level of the branchial regions. 
A&thusa lata Rarue. 
Plate Vi. Pig IGT”. 
Ethusa lata Ravus., Proc. U. 8. Nat. Mus., XVI. 258, 1893. 
Aithusa pubescens Fax., Bull. Mus. Comp. Zodl., XXIV. 160, 1893. 
Station 3367. 100 fathoms. 1 female. 
After examining the type specimens of @. /ata Rathb., | am inclined to 
attribute the slight differences between them and 4. pubescens to difference 
in age, the specimen which I described under the name of 4. pubescens being 
more than twice the size of the type specimens of @. lata. In the male of 
4. lata the right and left chelipeds are very unequal. 
This species was first obtained by the “ Albatross” in 1889, in the Gulf 
of California at a depth of 14-35 fathoms. It is the Pacific representative of 
E. microphthalma Smith * of the Atlantic side of the continent. 
* Proc. U.S. Nat. Mus., IIIT 418, 1881; VI. 22, 1883. 
