NO. 1573. PARASITIC COPEPODS— WILSON. 369 



segment, passing back to the end of the posterior lobe, then forward 

 to the anterior margin, and then back to the vulva, which opens 

 between the abdomen and the genital segment. The vaginal open- 

 ings are on the ventral surface, clos.e together, one on either side of 

 the mid line just in front of the base of the abdomen. From these 

 may often be seen protruding the ends of the ducts of discharged 

 spermatophores. The cement glands are very large, as would be 

 expected when we remember that the egg strings are several times 

 the length of the body. They occupy a large share of the ventral 

 surface of the genital segment in front of the abdomen; each is in 

 the shape of a figure 7 inverted. 



Total length, 13 mm.; length of carapace on mid-line, 4 mm.; 

 length of fourth segment plates, 4 mm. ; length of abdomen, 6.5 mm. ; 

 width of cax'apace, 5 mm. ; width of fourth segment plates, 6 mm. 



Color, a dull grayish yellow, uniform and lighter on the ventral 

 surface, darker on the dorsal surface, with the center of the carapace 

 between the lateral grooves and the entire surface of the fourth seg- 

 ment plates a dark chestnut brown. The internal coils of the oviduct 

 also show through the dorsal surface of the abdomen as light brown 

 in color. 



(coleoptratus , koXsos, sheath and Ttrepov^ ^ving, the dorsal plates of 

 the fourth thorax segment resembling the elytra of beetles.) 



This is the type species upon which Steenstrup and Liitken foinided 

 the present genus and was identified by them from Guerin's figures 

 and description. They gave as one of its synonyms " Pandarus 

 alatus," described by Johnston in 1835; the latter believed his species 

 to be identical with the " Pandarus alatus '' published two years 

 earlier by Milne Edwards. 



Steenstrup and Ltitken doubted this identity of the two species, 

 and careful examination confirms their doubt. (See p. 365.) Hence the 

 specific name used by Johnston can not stand, although it was pub- 

 lished two years prior to that of Guerin. 



There are three lots of specimens belonging to this species in the 

 U. S. National Museum collection. Cat. No. 6185, from the back fin of 

 Tsurus dekayi at Woods Hole, Cat. No. 8179, from Cornwall, Eng- 

 land, in exchange with A. M. Norman, no host given, and Cat. No. 

 12056, from a shark captured near Unalaska, Alaska. 



ECHTHROGALEUS DENTICULATUS Smith. 

 Plate XX. 



Echthrogaleus dentiadatus Smith, 1874, p. 576. — Rathbun, 1884, p. 488. 



Female. — Carapace orbicular, a little wider than long; lateral and 



anterior margins strongly convex, posterior margin nearly straight. 



Dorsal surface divided by two longitudinal grooves into a very wide 



median and narrow lateral areas similar to those in Pandarus males. 



Proc, N. M. vol. xxxiii— 07 24 



