6 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. 64 



are lacking."* He was describing preserved material from the 

 Copenhagen Museum and hence his statements may safely be com- 

 pared with those made above for the present species. Here the 

 color is plain white, the only pigment visible is the orange-yellow 

 of the matured eggs, the eyes are not black but very pale reddish- 

 brown. In salminei the carapace is longer than wide ; Kroyer gave 

 the proportion as 20 to 19; here it is wider than long, as 19 to 18. 

 In salminei the abdomen of the female is one-eighth of the total 

 length and is wider than long; here the abdomen is one-sixth of the 

 total length and is a fourth longer than wide. 



Kr0yer's specimen of the male was a little more than a third of 

 the length of the female, its carapace lobes overlapped the abdomen, 

 and both carapace and abdomen w^ere considerably longer than wide. 

 In the present species the male is relatively much larger, its carapace 

 lobes do not reach even the third legs and the carapace is decidedly 

 wider than long while the abdomen has a length and breadth which 

 are about equal. In salminei the sucking disks are each a third of 

 the width of the carapace and so close together that they nearly 

 touch; here they are less than a fifth of the width of the carapace 

 and are well separated. In salminei the posterior sinus of the cara- 

 pace is one-fourth of the length of the carapace with nearly parallel 

 sides; here it is much shorter and the sides are widely divergent. 



The male described by Thiele^ and referred to Kr0yer's salminei 

 apparently does not belong to that species. It does, however, corre- 

 spond almost exactly with the present species and may well belong 

 here. 



ANCHISTROTOS OCCIDENTALIS, new species, 



Plate 2, figs. 10-18. 



Host and record of specimens. — Six females with G:gg strings were 

 taken from the gills of the orange file fish, Ahitera scTioepfii at Woods 

 Hole, July 13, 1911, by V. N. Edwards. They become the types of 

 the species and have been given Cat. No. 54138, U.S.N.M. 



Specific characters of the female. — Cephalothorax strongly arched 

 dorsally, flattened and reentrant ventrally and much larger than 

 any of the free thorax segments. The latter diminish regularly in 

 size and the fifth segment is distinctly separated from and consider- 

 ably wider than the genital segment, its greatest width being through 

 the bases of the fifth legs. The genital segment is much wider than 

 long; the abdomen is four-jointed, the joints about the same length 

 but diminishing slightly in width. The anal laminae are small, 

 widely separated, and divergent, each armed with two unequal setae 

 at the tip and several smaller ones on the dorsal surface. The egg 



* Bidrag til Kundskab om Snyltekrebsene, 1863, p. 16. 



■" Mittheilung-en aus dem Zoologischen Museum zu Berlin, vol. 2, pt. 4, p. 26. 



