MUSEUM OF COMPARATIVE ZOOLOGY. 217 



Sergestes phorcus, sp. nov. 



Carapace devoid of spines ; rostrum cristiforMi, 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, mu(^h 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. rohustus Smith. 



Length, 65 mm. ; carapace, 21 mm. 



Station 3382. 1793 fathoms. 1 male. 



* 1 female. 



' 2 females. 



' 1 female. 



' 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. 



SUBOEDER SCHIZOPODA. 

 Family LOPHOGASTRID^. 



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 



