Pandarus lamnce. 203 



consisting of a stalk terminated with two small jointed pro- 

 cesses sparingly ciliated at the apex ; the stalks of the two 

 posterior connected with a broad movable lamina. Abdo- 

 men * oval, longer and narrower than the cephalothorax ; 

 the upper half covered with two square movable elytra of a 

 chestnut colour, very faintly scored and marked with pale 

 scattered dots ; the inner basal angles also pale, the posterior 

 margin oblique ; uncovered portion pale. Underneath, we 

 find four foliaceous processes attached above ; and near the 

 anal extremity there is a small square organ f , to which are 

 appended two foliaceous lamellae, uneven on the posterior 

 margin, and scarcely ciliated. 



I took the specimen now figured from an individual of the 

 Beaumaris shark of Pennant J; which was taken, in Sept. 

 1834, in Berwick Bay. It is a male; and the female, which 

 I have not seen, differs from it in having two filiform styles or 

 tubes, nearly twice as long as the body, appended to the tail. 

 It appears to be parasitical on several species of fish ; and 

 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. 



The student who is anxious to see how ingeniously the few 

 and simple organs of this creature can be analysed and re- 

 solved into parts corresponding with the complex organs of 

 the crab and lobster, must consult the interesting memoir of 

 Milne Edwards, above referred to ; and who is the only 

 naturalist who has noticed the species. I must acknowledge 

 that the analogies seem not a little imaginary ; and the no- 

 menclature derived from them is at least faulty, in so far that 

 it gives, or is apt to give, erroneous ideas relative to function. 

 The feet-jaws are not subservient to manducation in any way. 

 The animal, is suctorial, and requires no jaws; and these 

 organs are used solely to obtain fixedness of place : while the 

 thoracic feet, again, are not organs to walk or creep on, but 

 are only calculated for swimming ; which, we can conceive, it 

 may often have occasion to do. 



34. Pa'nDARUS LA'MNiE {fig. 22.). 



Description. — Cephalothorax round, with a narrow mem- 

 branous border, which, in drying, tears up like a fringe ; 

 convex dorsally ; pale, with a brown blotch in front ; com- 



* The thorax of M. Edwards ; of which the carapace is the first, the 

 part covered by the scales or elytra the second, and the naked portion the 

 third, segment or ring. 



J The abdomen of M. Edwards, the tail of Leach. 

 Lamna monensis of Cuvier, according to Mr. Yarrell. 



