314 



The abdominal false feet have two equal filaments, with the 

 exception of the first pair, of which one of the filaments is 

 extremely small or rudimentary. The eggs are remarkably 

 large and not numerous. 



The colour of the Mediterranean species described by 

 Risso, and which I believe to be identical with this, is thus 

 given by that author: The body is white, slightly iri- 

 descent, transparent, banded with red at every articulation ; 

 the eyes black ; the antennas, pedipalps, and feet red, and 

 the caudal scales dotted with the same colour. 



Total length of specimens from the Bristol Channel about 

 three inches. 



I have already alluded to the obscurity in which this 

 genus has been involved ; and which has arisen, in great 

 measure, from the extremely erroneous figure given by 

 Risso in his " Histoire des Crustaces de Nice," &c. This 

 figure in fact is so bad, that it affords no ground whatever 

 for any determination of the species : it is indeed much to 

 be regretted that in a work in which so many interesting 

 species were first described, the figures are almost univer- 

 sally so imperfect as to afford no specific character which 

 can be at all depended upon. Savigny, in his masterly 

 " Memoires sur les Animaux sans Vertebres," establishes 

 the genus by name, but without any description, retaining 

 the specific name of Sivado after Risso. Leach, who ap- 

 pears from some other circumstances to have been unac- 

 quainted with Risso's earlier work, gives to a specimen in 

 the British Museum the name of P. Savignii, but he has 

 not, as far as I am aware, published any account of it. 

 Milne Edwards, upon the credit of Risso's figure, has con- 

 sidered the Mediterranean species as distinct from the 

 British ; and he has added a third species, which he calls 

 P. brevit'ostris. I do not think, however, that the cha- 



