1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 315 

 RECORD OF SPECIMENS EXAMINED. 



From the Saud-shark, Carcharias americanus : 



Vineyard Sound, Mass., 1875, 10 specimens, 9 (6202, 6208*) ; 1880, 30 9 (6021) ; 

 1882, 14 9 (6028, 60.30) ; 1883, 25 9 (6034, 6041) ; 1884, 10 9 (8121) ; 1885, 20 

 9(10744). 



From Atwood's Shark, Carcharodo7i Atwoodi : 



Vineyard Sonud, Mass., 1871, 25 9 (6172). 



From the Dog-Fish, Mustelus canis : 



Vineyard Sound, M.ass., 1875, 14 9 (6199, 6203); 1883, 7 9(6046); 1884, 3 9 



(8124, 8126); 1885, 3 9(10745). 

 Long Island Sound, off Noank, Conn., 1874, 1 9 (6207). 



Fandarus Smithii, sp. nov. 



(Plate V, fig. 3 ; plate VII, fig. 9.) 



This is a large species, dififering- considerably from both P. Cranchii 

 and P. sinuatus, though resembling the former more closely than the 

 latter in general ai)pearance. From P. Cranchii it may be readily dis- 

 tinguished by the shape of the frontal plates and of the anterior body 

 segment. The median dorsal portion of the second segment, between 

 the lateral lobes, is extended some distance backward, in the shape of 

 a transverse, chitinous plate, and the appendage of the third segment 

 is divided into two separate lobes. The fourth segment is exceedingly 

 large, while comparatively little of the fifth segment is visible from 

 above. In the characters of the second and third segments this species 

 bears some resemblance to P. lugubris Heller,t but otherwise the two 

 are very unlike. 



Frontal plates broad, with the anterior margins strongly and regu- 

 larly curved, increasing rapidly in width from the median line of the 

 body to the point where they become free ; posterior free margin en- 

 tirely adjacent to the margin of the first segment ; outer extremities 

 broadly and regularly rounded. In alcoholic specimens but a very 

 small portion of the basal joint of the first antenuiie is usually exposed 

 in dorsal view. 



First body segment large, slightly broader than long; front margin 

 well rounded ; lateral margins convex, diverging somewhat rapidly for 

 about three-fourths the length of the segment, thence bending inward 

 toward the postero-lateral angles, which are rounded, and extend a 

 moderate distance back of the median portion of the i^osterior margin; 

 posterior margin with four sharply-pointed, spine-like teeth on each 

 side of a median one, which is shorter than those adjoining it. Lateral 



* The numbers inclosed in parentheses refer to the Crustacean record-books of the 

 U. S. National Museum, in which the specimens are catalogued. 



tReise der ffiaterr. Fregatte Novara; Zool. Theil, Band II, p. 205, pi. XX, figs. 

 1, 2, 1868. 



