100 BULLETIN OF THE 



This specimen, althongh 27 mm. in length, is not yet adult, as shown by the 

 rudimentary condition of the seventh pair of legs, and differs from the pre- 

 ceding especially in having the eyes more finely granulated. The material is 

 too incomplete to attempt a fuU description. 



Syscenus infelix Haeger. 



Plate III. Figs. 5, 5 a. Plate IV. Figs. 3 - 3h. 



Syscenus infelix Hakger, Rep. U. S. Fish Com., Pt. IV. for 1878, p. 387. 1880. 



Three specimens of this species were obtained at two localities; viz. a sin^-le 

 female at Station 303, Lat. 41° 34' 30" N., Long. 65° 54' 30" W., from 3*06 

 fathoms, and two males at Station 309, Lat. 40° 11' 40" N., Long. 68° 22' W., 

 from 304 fathoms. Besides these specimens a considerable number have also 

 been obtained by the U. S. Fish Commission, from various localities along the 

 coast as far south as Delaware Bay, and from a depth as great as 372 fathoms, 

 so that the species, originally described from a single specimen, has now be- 

 come comparatively common in the collection, and I am enabled to make 

 some corrections iu the description already given, as well as to add further 

 details and present figures of the species. 



Many of the specimens since obtained are larger than the type, and such 

 examples often have the body quite distinctly corrugated and rather coarsely 

 pitted, especially upon the head and the anterior part of the thorax or pereion. 

 In some of the larger males the ocular regions on each side of the head are 

 swollen and distinctly pitted and corrugated. On the lateral margin of the 

 head is a notch, into which may be received a short process oil the anterior 

 angle of the first segment, thus producing a very firm articulation when the 

 head is drawn closely against the first segment. The flagellum of the anten- 

 nula is usually composed of seven segments instead of six, but the number 

 may be different on opposite sides of the same specimen. A bottom view of 

 the head, enlarged eight diameters, is given ou Plate IV. Fig. 3, showing the 

 antennary organs, the right antenna being removed to show the antennula 

 of that side. 



The maxillipeds (PI. IV. Fig. 3 c) are robust, thickened along the inner or 

 median side where they meet; the first segment of the palpus is large, nearly 

 square, and armed at its inner distal angle with a single hook; its distal margin 

 is shorter than the proximal, and is angulated at the articulation with the second 

 short transverse segment. This segment is armed distally with three hooks, 

 of which' the anterior appears to be articulated and should perhaps be regarded 

 as a third segment of the palpus. The outer or second maxilla; are thin, deli- 

 cate, and obscurely lobed at the tip, where they are armed with a single small 

 hook. The inner or first maxilla; (PL IV. Figs. 3 b, 3 b') are armed with 

 spines, of which the inner are shorter and straight, the outer are larger and 



