Bibliographical Notices. 321 



Portuntis Dalyellii. PL XI. fig. 9. 



The most remarkable points which distinguish this crab from 

 any other species of the genus to which it belongs^ are to be 

 found in the large development of the posterior marginal teeth 

 of the carapace, the base of each of which continues prominent, 

 so that a line or ridge extends quite across the centre of the 

 back of the crab, which gives to the anterior half the appearance 

 of being depressed forwards. It is this ridge, together with the 

 two prominent teeth, by which the species may be most quickly 

 recognized. 



The front of the carapace between the eyes is divided into 

 three scarcely appreciable lobes, of which the centre one is de- 

 pressed in the middle. 



The terminal joints of the fifth pair or swimming feet are 

 scarcely so flat and oar-shaped as in most of the Portunida, there- 

 fore this species approaches nearer the transition-type of the genua 

 Carcinus, and its long and active-looking legs seem to corroborate 

 the idea of its habits being mostly perambulatory. 



The first pair of feet unfortunately are missing from this the 

 only specimen which I possess; it was brought me a few days 

 since by Mr. Matthew Moggridge, who took it in Oxwich Bay 

 near Swansea. 



The colour is a brilliant reddish brown with darker blotches 

 of the same. I have taken upon myself to identify the species 

 by the name of Sir James Dalyell, which has become distin- 

 guished in natural history by his valuable researches. 



Upon forwarding a sketch of the sjjecies to Mr. Couch of 

 Penzance, so well known as an observer in this department of 

 science, he in reply informed me, that three years since he had 

 mentioned to Prof. Bell that we had in Mount^s Bay a species of 

 Portunus not described by authorities, and that in the year fol- 

 lowing he had sent him an injured specimen taken there, but 

 had not as yet received his opinion on the subject. Mr. Couch 

 adds, " I recollect being convinced it was quite new ; and it is 

 the species figured by you. Dalyell's name is worthy of all 

 honour "" 



>} 



Mount's Bay, like the coast upon which the specimen figxired 

 was taken, has a sandy bottom and beach. 



BIBLIOGRAPHICAL NOTICES. 



Observations in Natural History. By the Rev. Leonard Jenyns, 

 M.A., F.L.S. &c. London, John Van Voorst. 



The cultivators of a science have some points of analogy vrith the 

 settlers in a new country ; of the latter some wander into the inte- 

 Ann.^-Maff.N.Hist.SeT.2. Vol. yii. 21 



