42 G. 0. sars. [No. 7. 



6. Dunhevedia crassa, King. 



(Pi 5, figs. 1-4). 



Dunhevedia crassa, King, On Australian Entomostracans, L 

 c. p. 261, PI. VII. F. 



Specific Characters. — £. Carapace of adult female, as 

 seen laterally, nearly semicircular, with the dorsal edge boldly 

 arched, ventral nearly straight in the middle and somewhat pro- 

 jecting anteriorly, posterior extremity obtusely truncate, with the 

 inferior corners rounded; a small denticle present in front of the 

 latter. Form of carapace, as seen ventrally, obovate, not con- 

 stricted in the middle, posterior part tapering. Head nearly as 

 broad as carapace, decumbent, rostrum acute, slightly curved. 

 Eye with 4 large projecting crystalline lenses; ocellus scarcely 

 1 /i as large, irregularly quadrangular and placed nearer to the 

 eye than to the tip of the rostrum. Tail with the dorsal angle 

 very pronounced, about in the middle, outer part rather broad, 

 with small tufts of hair at the sides. Colour bright yellowish 

 or corneous. Length of adult female 0.50 mm. 



Memories. — I do not feel any doubt as to the identity of 

 this form with the species described by King under the above 

 name. It agrees comparatively well with the description and 

 figure given by that author, and is easily distinguished from the 

 other species, D. podagra King, by the regular obovate form of 

 the carapace, as seen dorsally or ventrally, whereas the latter 

 species has it distinctly constricted in the middle. 



Description. — The length of the adult ovigerous female is 

 about half a millimeter. 



As to form, the whole animal is considerably tumid and m 

 this respect resembles rather the species of Ghjdorus than 

 those of Pleuroxm. The carapace exhibits in a lateral aspect 

 (PL 5, fig. 1) a very broad, nearly semicircular form, with the 

 posterior part slightly tapering. The dorsal edge is boldly arched 

 in the middle and anteriorly continued into the dorsal edge o 

 the head, without any intervening sinus; posteriorly it terminates 

 with an obtuse angle. The inferior edges of the valves bulge 



