COPEtODS OF THE WOODS HOLE REGION 431 



DINEMATURA PRODUCTA (Miiller) 



Figure 270 



Caligus productus Muller, Entomostraca, p. 132, pi. 21, figs. 3^, 1785. 

 Dinematura producta Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 380, pi. 23, 1907.— 

 Brian, Monitore Zool. Ital., anno 22, no. 8, p. 197, 4 figs., 1911 (male). 



Occurrence. — Taken from the fins of a " large shark " captured by 

 the Grainyus considerably south of Woods Hole. 



Distribution. — British seas (Johnston, Baird, T. and A. Scott, Nor- 

 man) ; Kattegat (Steenstrup and Liitken) ; coast of Norway (Jen- 

 sen) ; Faroe Islands, Greenland (Hansen) ; Finmark (Kr0yer) ; Gulf 

 of Genoa (Brian) ; Denmark, Norway (Miiller) ; Casco Bay, Me. 

 (Wilson). 



Color. — Body of preserved specimens a uniform light brown. 



Female. — Carapace orbicular, deeply notched at the center of each 

 lateral margin ; second and third segments filling the space between 

 the posterior lobes of the carapace, third segment 

 with lateral-dorsal plates wider than those on sec- 

 ond segment. Dorsal plates of fourth segment sep- 

 arated by a deep median sinus, their posterior ends 

 evenly rounded. Genital segment twice as long as 

 wide and half as wide as the carapace, its dorsal 

 plates obliquely truncated; dorsal plates of sixth 

 segment narrow and elongate, with rounded tips. 

 Abdomen quadrangular; caudal rami foliaceous, 

 with spines only; rami of fourth legs boot shaped, 

 the heels turned outward; sixth legs 1-segmented, 

 reaching the center of the caudal rami. Total 

 length, 15-19 mm. figure 270. — Dme- 



Male.—CsirsLpace orbicular, wider than long; FemaS '"dofsaf"' 

 second and third segments narrower and longer 

 than in the female, both with dorsal plates ; fourth segment without 

 dorsal plates, the same width as the genital segment, contracted into 

 a short narrow waist anteriorly. Genital segment elliptical, scarcely 

 twice as long as wide, with evenly rounded posterior corners; no 

 lobes, no dorsal plates, no leg rudiments, no sixth segment. Abdomen 

 2-segmented, the distal segment twice the length of the basal, the 

 two the same width; caudal rami spatulate, each with four short 

 setae. Total length, 12.5 mm. 



Remarks. — This species was really obtained a little south of the 

 present area, but as these southern sharks come into Vineyard Sound 

 during summer, one of them is likely to be found carrying this 

 parasite. 



