432 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



DINEMATURA LATIFOLIA Stecnstrup and Liitken 



Figure 271 



Dinemaiura latifoUa Steenstkup and Lutken, Kong. Dauske Vid. Selsk. Skrift., 

 ser. 5, vol. 5, p. 378, pi. 8, fig. 16, 1861.— Wilson, Proc. U. S. Nat. Mus., voL 

 33, p. 383, pis. 24, 25, 1907. 



Occutrence. — Taken from the skin and fins of tlie mackerel shark 

 {Isw^s punctatus) and the great white shark {CaTchurodon carcha' 

 Has) at Menemsha Bight, Marthas Vineyard. 



Distnbution. — Northern Atlantic (Steenstriip and Liitken) ; 

 Mediterranean (Heller, Cams) ; South Africa (Wahlberg) ; Adri- 

 atic (Valle) ; Island of Elba (Brian) ; Coxs Ledge, 

 Mass. (M. Kathbun) ; English coast (Wilson). 



Color. — Body yellowish green, considerably 

 darker in the thicker parts of the body, the dorsal 

 plates and thin margins a clear light yellow. 



Female. — Carapace twice as wide as long on the 

 midline, its posterior lobes curved inward ; second 

 segment shorter than the third but wider, with a 

 pair of large dorsal plates ; third segment wedge- 

 shaped and without dorsal plates ; fourth segment 

 with plates extending laterally beyond the mar- 

 gins of the genital segment, and posteriorly 

 nearly to its center. Genital segment elongate, its 

 Figure 2 7 1. —Dine- length to its width as 11 : 7, its dorsal plates much 

 Female!" dorfaf'"' narrower than the segment itself , with bluntly 

 rounded tips. Dorsal plates of sixth segment 

 separated by a narrow sinus ; abdomen Iddney-shaped, twice as wide 

 as long; caudal rami one-half longer than wide, armed with spines 

 only. Total length, 14-16 mm. 



Male. — Carapace like that of the female, with very broad posterior 

 lobes; second and fourth segments with dorsal plates, third segment 

 without them. Genital segment oblong, enlarged posteriorly and 

 then contracted suddenly to the base of the abdomen; no leg rudi- 

 ments, no sixth segment. Abdomen 2-segmented, segments sub- 

 equal; caudal rami foliaceous, as large as the anal segment, and 

 armed with stout plumose setae. Total length, 8-8.5 mm. 



Be77iarks. — This species can be recognized by the projecting lat- 

 eral margins of the dorsal plates of the fourth segment and their 

 diagonal posterior truncation in the female. 



Genus PANDARUS Leach, 1816 



Female. — Head fused with first segment, the carapace without 

 grooves; posterior lobes short, the margin between them sinuate or 

 toothed; second segment with lateral dorsal plates, sometimes fused 

 across the midline ; third segment with median plates, fused or sepa- 



