KEPORT ON THE OSTRACODA. 107 



to some other species, perhaps to Cythere normani ; they were dredged at Station 296. 

 The species is named after M. Von Willemces Suhm, whose death during the voyage of 

 the Challenger was an irreparable loss not only to the Expedition but to zoological science 

 in general. 



[PL XXVI. fig. 3, a-h. a Shell of female (Station 241) seen from left side, h from 

 above, c from below, d from front, — magnified 40 diameters ; e-h left valve of 

 immature male probably (Prince Edward's Island), — magnified 50 diameters.] 



78. Cythere hyex, n. sp. (PL XVII. fig. 2, a-d). 



Valves, seen from the side, subquadrangular, rather higher in front than behind, 

 greatest height equal to nearly two-thirds of the length ; anterior extremity boldly and 

 evenly rounded, posterior narrower, truncate, very slightly rounded, obscurely angular 

 both above and below ; dorsal margin sloping gently, almost in a straight line from the 

 front, ventral slightly convex ; seen from above, the sides of the valve form a continuous 

 curve from end to end and are widest in the middle, extremities produced and obtusely 

 rounded. The right valve is less angular in outline than the left. Surface of the shell 

 uneven and covered closely with small stout spines, which are arranged in more or less 

 distinctly concentric rows ; on the ventral surface the spines coalesce, forming a longi- 

 tudinal rib-work ; the margins of the shell are uniformly dentated, the teeth being- 

 strongest on the anterior and dorsal regions. Length, l-25th of an inch (1 mm.). 



This is a deep-sea species, and occurred in three dredgings : lat. 38° 30' N., long. 

 31° 14' W., 1000 fathoms (Station 73) ; lat. 37° 34' N., long. 25° 13' W., 1000 fathoms 

 (Station 78) ; lat. 32° 24' S., long. 13° 5' W., 1425 fathoms (Station 335). 



[PL XVII. fig. 2, a-d. a Left valve seen from side, h from above, c from below, 

 d right valve seen from side. Magnified 50 diameters.] 



79. Cythere ericea, n. sp. (PL XVII. fig. 1, a-d). 



Valves, seen from the side, c[uadrate, equal in height before and behind, sculptured 

 with numerous but not very large rounded excavations, and thickly beset with long cir- 

 cixlar spines ; anterior extremity rounded ofi", posterior truncated, well-rounded below, but 

 only slightly at the upper angle, height equal to two-thirds of the length ; seen from 

 above the outline is ovate, evenly curved, widest behind the middle, tapering gradually 

 towards the front but more rapidly behind. Length, l-25th of an inch (1 mm.). 



This species has been seen only in one dredging., from lat. 8° 37' S., long 

 34° 28' W., 675 fathoms. The valve shown at figure d is totally denuded of spines, no 

 doubt by abrasion, and it is certain that in perfect condition the shell would be much 

 more profusely spined than is represented even in figure a. 



[PL XVII. fig. 1, a-d. c Left valve seen from side, h from above, c from front, d 

 left valve (another example) denuded of spines. All magnified 50 diameters.] 



