Aficeusjbrfiatldrius. , 273 



Dr. Leach's Pod. Mai. Brit, in the size of its first pair of 

 legs, the formation of the finger and thumb, and in having its 

 eyes concealed (though on peduncles) under the shell, and in 

 the shape of the anterior part of its shell. I have found three 

 individuals. 



The line denoting the natural size represents the length 

 from the end of the tail to the front margin of the thorax. 



Both these Palaemon/^ were found in a mass of Filipora 

 filograna, which was brought up by the trawl net off Hastings, 

 in February, 1835. 



Anceus forficularius Risso. 



[Mr. Hailstone, in his sketch of this animal, had in view, not 

 the exhibiting of a complete picture of it, but of those features 

 characteristic of it by which a proficient naturalist could iden- 

 tify it : we have not, consequently, had the drawing engraved. 

 Mr. Hailstone had written beneath it as follows] : — Is this 

 Anc&us forficularius of Risso, or Cancer maxillaris of Montagu, 

 described in the Linn. Trans. ? Ten legs, each terminated in 

 a simple claw; two antennae on each side. [Mr. Westwood's 

 reply is the following] : — This is the Gnathia Leach (Edin. 

 Encyc), Anceus Risso (Crust. Nice.) ; species maxillaris Mon- 

 tagu, forficularius Risso, termitoides Leach, in the British 

 Museum. Dumeril has made some observations indicating 

 differences, even generic, between Anceus and Gnathia ; but 

 Mr. Hailstone's drawing, with one which I have made from 

 Leach's specimens, clearly shows that the two groups are iden- 

 tical, the eyes being lateral, as in Montagu's figure, and the 

 tail lamellose, as in Risso's. It has been said that this is the 

 male of the genus Praniza, of which I have published an ac- 

 count in the Annates des Sciences Naturelles. Is this so? — 

 J. O. Westwood. 



[Of the genus Praniza, Dr. Johnston has communicated, 

 in V. 520 — 522., a description of a species which he has 

 named fuscata, not previously published, as a native of Bri- 

 tain ; and has made collateral notice of the P. caeruleata, pre- 

 viously known to inhabit Britain.] 



[Notes on Pontophilus, species bispinbsus Westwood, by Mr. 



Westwood.'] — I can find no description of any species either 



of Crangon or Pontophilus * (for the size of the terminal 



joint of the external foot-jaws and of the second pair of legs 



seems, in this animal, to be quite intermediate between the 



* The Crangon 7-carinatus of Sabine (Voyage to the North Pole, pi. 2. 

 f. 11.) belongs to the subgenus or section Pontophilus, thus making a 

 fourth species referable thereto, namely, spinosus Leach, trispinosus Hail- 

 stone, bispinosus Westwood, 7-carinatus Sabine. 



