MUSEUM OF COMPARATIVE ZOOLOGY. 217 
Sergestes phorcus, sp. nov. 
Carapace devoid of spines; rostrum cristiform, short, subquadrate, the 
anterior margin produced to a short point in the middle. Second, third, and 
fourth abdominal segments lightly sulcate in the median dorsal line ; sixth 
somite armed with a minute posterior dorsal spine. Eyestalk shorter than 
proximal segment of the antennulary peduncle ; eye subspherical, much wider 
than its stalk. First and second segments of the antennulary peduncle of 
equal length, the third considerably shorter. Thoracic appendages much like 
those of S. robustus Smith. 
Length, 65 mm. ; carapace, 21 mm. 
Station 3382. 1793 fathoms. 1 male. 
5 3386. 242 Hf 1 female. 
E 3388. 1168 " 2 females. 
5 3401. 395 " 1 female. 
* .. 8497. -6028 es 1 female. 
Sergestes halia, sp. nov. 
A small species, in which the cervical groove is nearly obliterated on the 
dorsal part of the carapace, and the posterior transverse furrow, which in 
some species of Sergestes forms the front boundary of the cardiac area, is 
obsolete. A sharp spine near the antero-lateral margin of the carapace, and 
another on the hepatic area. Rostrum cristiform, tapering to a slender, acute 
point, which overreaches the eye. A longitudinal ridge runs from the base of 
the antenna backwards, dividing at the hepatic spine into a superior and an 
inferior branch'; the former forms the upper boundary of the branchial area, 
the latter courses along the middle of the branchial area and fades out before 
reaching the posterior border of the carapace, Abdominal segments unarmed. 
Length, 29 mm. ; carapace, 9.3 mm. 
Station 3388. Surface to 400 fathoms (submarine tow-net). 3 males. 
SUBORDER SCHIZOPODA. 
Family LOPHOGASTRIDZ. 
Gnathophausia dentata, sp. nov. 
In this species a thin triangular crest, produced at the apex to a spine, is 
found at the base of the rostrum, over the anterior part of the gastric region ; 
a minute denticle near the anterior, and another near the posterior end of the 
crest. The lower spine of the infero-posterior angle of the carapace is reduced 
to a mere tooth, obsolete in some specimens. Antennal scale very broad 
(breadth equal to one half the length.) 
Distinguished from G, gracilis W.-Suhm by the prominent dentate gastric 
