1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 317 



with the three terminal spines arranged in an oblique series, trending 

 inward from the tip. 



There are four specimens from the sand-shark, and they resemble No. 

 8119 more than they do the types, though differing somewhat from the 

 former. They are lighter in color, and the transverse light area on the 

 front part of the first segment is larger and less well-defined ; the five 

 median spines of the posterior margin of the same segment are carried 

 on a shght backward projection of the margin, and tlie two additional 

 spines on each side are very small. The dorsal lobes of the third seg- 

 ment are widely separated throughout, and the appendage of the fourth 

 segment is smaller than in the types, leaving much more of the fifth 

 segment exposed above. The caudal plate and stylets are similar to 

 those of 8119 ; the ovigerous tubes are slightly longer than the body. 

 The largest of the s])ecimens measures 9"^"" in length of body, and the 

 others are not much smaller. 



Fandarus Cranchii Leach. 



(Plate V, fig. 1.) 



A number of specimens of this species were obtained from a large, 

 undetermined species of shark, taken by the TJ. IS. Fish Commission 

 steamer Albatross oif the Capes of Virginia, at station 2422, lat. 37° 

 08' 30" N., long. 74° 33' 30" W., June, 1885. Other American localities 

 for the species have already been recorded by the writer.* 



Genus CHONDRACANTHUS De la Roche. 

 Chondracanthus galeritus, sp. nov. 



(Plate VIII, figs. 1-7; plate X, figs. 1-7.) 



Bather below the medium size, elongate, but exceedingly variable 

 shape, according to the amount of contraction or method of preserva- 

 tion. When most extended, the total length of the body is three or 

 more times the greatest width, which is across the abdomen. In much 

 contracted specimens, the width is sometimes nearly equal to the length. 

 In the former case, with alcoholic specimens, the head is generally 

 thrown back, the thorax and abdomen straight, smooth, and much in- 

 flated, as on plate Till, figs. 1,2; in the latter, the body is more or less 

 compressed, and curved or twisted, the thoracic and abdominal portions 

 with thickened margins and more or less pronounced foldings on the 

 dorsal surface. Considering the former as the more normal shape, we 

 have confined our description mainly to it. 



The head is slightly elongate, broadest near the front, and narrows 

 gradually backward. The dorsal portion is inflated and projects to a 

 greater or less extent over the ventral and basal portions, like a hood 

 or cap. The front margin is broad, approximately straight, the antero- 



*Proc. U. S. Nat. Mus., vol. vii, 1884, p. 488. 



