NO. 1573. PARASITIC COPEPODS— WILSON. 383 



words that both Steenstrup and Liitken and Olsson had shown that 

 it was a synon3an of D. producta. 



This male is figured very poorly; no frontal plates are shown; 

 there are no dorsal grooves or markings of any kind upon the car- 

 apace, and the second and third thorax segments are hopelessly con- 

 fused. But the general outline, the relative proportion of the vari- 

 ous parts, and such of the details as can be made out correspond 

 closely with those of the male of latifolia here for the first time shown 

 (see p. 386). The rami of the second legs are three-jointed, as they 

 should be, but he describes the basal joints of the third legs as fused 

 across the mid-line into a broad apron wholly covering the fourth 

 pair. The rami of these third legs are attached to the sides of the 

 apron and appear to have only two joints in the figure given; noth- 

 ing is said of the number of joints in the text. 



In the latifolia male the basal joints of these legs are greatly 

 enlarged and nearly meet on the mid-line, but the rami are attached 

 to the posterior margins and are distinctly tlu-ee-jointetl. The first 

 maxillipeds also in Beneden's specimen show no tuft of seta? between 

 the two terminal claws, while the first swinmiing legs as he has repre- 

 sented them are unlike anything known amongst the parasitic cope- 

 pods. They are cylindrical, uniramose, and one-jointed, with three 

 plumose seta? attached to the anterior margin near the end and 

 curved over the ventral surface; the end of one is split and armed 

 with small spines; the other is entire and bluntly rounded. In the 

 text these appendages are said to be the same as those of the female. 



In the presence of such inconsistencies it is of course impossible 

 to locate the species with accuracy, but the resemblance between 

 this male and the one of latifolia about to be described seem to over- 

 balance the differences, and the form Beneden has presented may be 

 a Dinematura male as he claims. 



The Museum collection contains three lots of this species; one, 

 Cat. No. 12678 U.S.N.M., contains two females obtained from a large 

 shark in Casco Bay, Maine. The second is Cat. No. 12679 U.S.N.M. 

 and contains six females taken from a large shark captured at the 

 surface in latitude 38° 07' N. and longitude 74° 21' W. on May 10, 

 1887, by the Bureau of Fisheries schooner Grampus. The third is 

 Cat. No. 8106 U.S.N.M. and consists of a single female taken from 

 a shark near Shetland; it was obtained by exchange. 



DINEMATURA LATIFOLIA Steenstrup and Lutken. ^ • 



Plates XXIV and XXV. 



Dinematura latifolia Steenstrup and Lutken, 1861, p. 378, pi. viii, fig. 16. — 

 Brian, 1898, p. 14, pi. ii, fig. 10. — Bassett-Smith, 1899, p. 463. 



Female. — Carapace transversely elliptical, the width twice the 

 length on the median line: frontal plates narrow but distinct, their 



