396 



PROCEEDINGS OF THE ACADEMY OF 



[1897. 



do not extend to the vertical line of the eyes. The flagellum of the 

 antenna? has nine or ten joints. The sides of the thorax are very 

 much less arcuate than in nebulosa, and where in the latter species 

 the margins are rounded, in this they project in obtuse angles; the 

 lateral margins of the three posterior segments are straight. The 

 abdomen is very, much as in nebulosa. In color this species in part 

 simulates nebulosa. In the specimens examined it lacks the black 

 flakes, there is a line of spots near the margin and one in line with 

 the epimeral lines. 



The largest good specimen is 11 mm. in length. 



Stations 2,868, 2,869 and 2,872, in 31 to 38 fathoms. 



Station 2,869, lat. N. 47° 38' 00", Ion. W. 124° 39' 00" ; 32 fath- 

 oms. Types (No. 20,506, U. S. N. M.). 



Synidotea pallida, new species. Fig. 7. 



The frontal margin is deeply 

 and evenly concave, there being 

 no median notch. The surface 

 between the eyes is protuberant 

 and is divided by a slight me- 

 dian impressed line. In the 

 angle formed by the raised por- 

 tion between the eyes and the 

 horizontal front are two horn- 

 like tubercles united at the bases 

 by a very short ridge across the 

 median line. The cephalic su- 

 ture is deep but closed at tlie 

 bottom. The peduncles of the 

 antenna? are about equal to the 

 flagella in length ; the latter 

 have from 12 to 16 segments. 

 The eyes are small, situated at a 

 distance from the margin on 

 slight elevations. The sides of the head and of all the thoricic seg- 

 ments are thin and produced, nearly horizontal. The four anterior 

 segments are long, with rounded post-lateral angles, the three pos- 

 terior segments are short with subacute angles. On each side at a 

 little distance from the median line on the 2d, 3d and 4th segments 

 is a single spine. In young specimens the spines are proportion- 

 ately longer and they are replaced on the posterior segments by low 



Fig. 7. 



Synidotea pallida Benedict. 

 x2J. 



