AN ODD NAME 253 



condition. The genus is compared with Rachitia spinalis^ 

 Dana, a young animal taken in the Atlantic, which, how- 

 ever, differs ' in having the rostrum short, in the first pair 

 of antennfB having only a single flagellum, and in the 

 form of the telson.' The name OodeojJus perhaps alludes 

 to the circumstance that in some of the specimens the feet 

 wore beginning to swell or bud out, but for swollen feet 

 the Greeks had already provided the name CEcUpin^, and 

 Dana had already used this name for another genus of 

 prawns, and other naturalists had used it for other pur- 

 poses before Dana. The alternative derivation of Oocleopt(s, 

 as meaning ' with feet on the ground,' seems to make the 

 name entirely pointless. 



Aidonomceci, Risso. 1816, mav here be mentioned as a 

 genus of which the position is obscure. It is described as 

 having the first pair of trunk-legs chelate, the second 

 simple. Risso distinguishes it from Alpheus and Nika. 

 Milne-Edwards places it next to Ponton ia, Victor Carus 

 puts it between Anchistia and Pandalus. The type species 

 was named Aidonow^cea Olivii by Risso, but as he makes 

 Cancer glaher, Olivi, a synonym, it is hard to see why it 

 should not be called Autonomcea glaber. Jonathan Couch 

 in his Cornish Fauna is quoted by Adam White and 

 S pence Bate as saying of it : ' This species has been 

 hitherto unknown as British, but I have examined several 

 specimens taken from the stomachs of fishes, from the 

 depth of fifteen or twenty fathoms. Some of these were 

 of larger size than described from the Mediterranean ; 

 one, not the largest, measuring three inches from snout to 

 tail, with antennoB of the length of five inches.' 



Legion 4. — HaplopocUnea. 



All the trunk-legs are similar in structure to each 

 other, simple, six-jointed, with the fifth joint not sab- 

 divided, and all but the last pair carry exopods. 



