ff)] DECAPODA FROM ALBATROSS DREDGIHGS. 349 



ACHELOUS GiBBESii Stimpson. 



Neptunus G'lhhcsti A. M. -Edwards. 

 Station 2107, November 0, north lat. 33o 19' 30", west long. 75o 15' 

 20", IG fathoms. — Three specimens (5633), one male and two females, 

 one of which is carrying eggs. 



LEJUCOSOIDEA. 



Persephone punctata Stimpson ex Browne. 



Station 2114, November 10, nortli hit. 35° 20', west long. 75° 20', 14 

 fathoms, mud and broken shells. — One adult female (5655), aad two 

 very small young (50G4). 



DORIPPIDEA. 



Ethustna, gen. uov. 



This genus is nearly allied to Ethusa, which it resembles closely ex- 

 cept in the form of the front and the structure of the eyes. The front, 

 between the eyes, is quadridentate as in Ethusa^ bnt the basal segments 

 of the anteunulsB are very large and swollen, occupy the whole width 

 of the front, and crowd back the eyes and antennae into an almost 

 transverse position nearly beneath the outer orbital angles, which are 

 reduced to small lateral teeth far back from the front. The eye-stalks 

 are very small, and immovably imbedded in the orbits, which closely 

 inclose them to near the tii)s, except for a narrow space beneath. The 

 oral appendages are almost exactly as in Ethusa microphthalnm, but 

 there are no ijodobranchioe at the bases of the first gnathopods, so that 

 there are only six branchiiB each side, two arthrobranchire each at the 

 base of the second gnathopod and first peraeopod, and one pleurobran- 

 chia each for the second and third pera^opods. 



Ethusina abyssicola, sp. uov. 



(Plate II, Figs. 1, Iff.) 



Male. — The carapax at the branchial regions is nearly as broad as the 

 length to the middle of the front, but much uarrowed anteriorly, the 

 breadth of the front being about three-eighths of the length. The 

 middle teeth of the front are triangular, slightly upturned, and sepa- 

 rated by a triangular sinus a little broader and deeper than the rounded 

 antennular sinnses, while the lateral teeth are spiniform and longer 

 than the middle teeth but more strongly upturned, so that they scarcely 

 project in front of them. The surface of the carapax is nearly naked, 

 granulous, and areolated very nearly like that of Ethusa microphthalma. 



The eye-stalks project very slightly beyond the minute post-orbital 

 teeth, taper distally, are armed with a longitudinal ridge below, and 

 bear at the tips black eyes much smaller than the diameter of the 

 stalks. 



The chelipeds are equal, smooth, and naked, and less than twice as 

 long as the carapax, the merus is about a third of the entire length, 

 slender, unarmed, and without angles ; the carpus is short, rounded 



