DINEMOURA. 285 



1. DINEMOUIIA ALATA. Tab. XXXIII, figs. G, 7. 



PANDAKUS ALATUS, M. Edtcards, Ann. Sc. Nat., xxviii, t. 8. 



Johnston, London's Mag. Nat. Hist., viii, 203, 



f. M a, b. 



DINEMATURA ALATA, Burmeister, Nov. Act. Acad. Nat. Cur., xviii, 331 . 

 DINEMOURA ALATA, M. Edwards, Hist. Nat. Crust , iii, 464. 



Description. Body oblong, about half an inch in length 

 and two tenths of an inch broad. 



Cephalo-thorax squarely rounded ; slightly notched in 

 front. Dorsal plates, or elytra, convex and smooth, about 

 the same breadth behind as in front, and occupying about 

 a third of the length of the whole body. Their posterior 

 margin is cut even, but obliquely. They are of a ches- 

 nut colour, very faintly scored, and marked with pale, 

 scattered dots. The under surface of the body is of a 

 dead white. 



The last segment of the thorax is nearly of the same 

 length as the elytra, and has at its extremity a small, 

 horny tooth. 



The caudal appendages of abdomen scarcely project be- 

 yond the last segment of the thorax. They are broad and 

 somewhat square-shaped in the male ; longer and narrow 

 in the female, and have at their extremities several short 

 setae. 



This species was taken by Dr. Johnston from a Beau- 

 maris shark, in Berwick Bay, in 1834 ; and he observes, 

 that it " appears parasitical on several species of fish. It 

 generally attaches itself to the sides of the branchial covers, 

 adhering tenaciously, by thrusting the claws of the first 

 and third pairs of feet* through the skin." 



Hab. Beaumaris shark, Berwick Bay; Dr. Johnston. 



* Foot-jaws. 



