106 THE ZOOLOGIST. 



fourth joint broadly keeled above ; fifth and sixth acutely keeled ; 

 sixth joint slender, styliform ; terminal joint of posterior pair 

 of legs narrowly lanceolate, with a raised central line, hairy on 

 the edges. The specimens obtained were all young. I have 

 therefore preferred inserting the species in a note ; but it is pro- 

 bable it has been passed over as either P. arcuatus or P. corru- 

 gatus. It might also be easily mistaken for the young of C 

 mcenas. It occurred in the rock-pools and also under stones on 

 Ringlass Point." 



In the same volume, on plate ix., fig. 3, is represented a life- 

 sized immature specimen of Portunus carcinoides. Fig. 8 a on the 

 same plate is a drawing of the carapace twice enlarged. On 

 page 161, Dr. Kinahan again says — "P. carcinoides is a good 

 species ; it comes very close, however, to Otto's P. infractus, 

 which is included by Bell among the synonyms of P. longipes, 

 Risso, from which the trilobed front and length of legs would 

 separate my specimen." 



We have not had an opportunity of examining Dr. Kinahan's 

 type, and are therefore unable to express an opinion on Portunus 

 carcinoides. 



Portunus arcuatus, Leach. 



The species may be readily distinguished from the rest of 

 the Portunidce. The carapace is serrated as usual on the lateral 

 anterior margins ; the space between the orbits is not armed with 

 teeth, but the outer edge is quite smooth and slightly arched. Its 

 colour is of a sombre brown, but specimens occur of a reddish 

 brown and also of a dark greenish tint. 



The anterior pair of legs are armed with very stout and com- 

 pactly shaped forceps, evidently possessing considerable power. 

 The remaining pairs of legs do not present any striking feature ; 

 the last pair, however, have the swimming blades but slightly 

 developed. 



This species is not nearly so common as most of the repre- 

 sentatives of the genus, and has been recorded from Galway (very 

 common) ; Belfast ; Milford Haven ; and coast of Devon. Bell 

 has also recorded its capture at Poole Harbour and the Bays 

 of Swanage and Studland ; Bognor ; Hastings ; and the Welsh 

 coast. We have obtained it from the Channel Islands ; Falmouth 

 (frequent) ; from the Thames estuary, on sandbanks near the 

 Nore lightship ; and also from the Sussex coast. Several of the 



