230 Occurrence of Squilla Desmarestii 



Art. XI. Notice of the Occurrence of Squilla Desmarestii on the 

 British Shores. By William Yarrell, Esq. F.L.S. 



When Dr. Leach commenced his work, Malacostraca Po- 

 dophthalmata Britannia, or descriptions of those British species 

 of the Linnaean genus Cancer which have their eyes elevated 

 on footstalks, he felt assured that many new species would be 

 discovered during its progress, and therefore requested that 

 the plates and descriptions might be so numbered, but not 

 paged, as to admit the interposition of any new subjects that 

 might occur, without interfering with the systematic arrange- 

 ment intended to be pursued. 



Several genera remain yet to be figured, to complete this 

 work, some of which contain species not at that time known 

 to belong to this country ; and were not therefore included in 

 the original manuscript. 



I am indebted to the kindness of Mr. Couch of Polperro, 

 Cornwall, for the possession of a specimen, and also for permis- 

 sion to send to this Magazine a notice of the capture of two 

 examples of Desmarest's Squilla on the Cornish coast, where 

 they were found among sea-weed. 



This species, which is not uncommon in the Mediter- 

 ranean, was named and described by M. Risso, in his His- 

 toire Naturelle des principales Productions de V Europe Meri- 

 dionale ; et particulierement de celles des Environs de Nice y et 

 des Alpes Maritimes* 



Stomapo^dia. 



Squi'lla Desmare'st/i Risso, Desmarest's Squilla. 



S. corpore fusco, dorso laevi ; lineis utrinque duabus lateralibus longitudi- 



nalibus elevatis ; pollicibus quinque dentatis. 



Fig, 23. is the exact size of the specimen taken, and mea- 

 sures 2 in. 4 lines in length. The general colour is yellowish 

 brown ; the antennae rather long, formed of three filaments, 

 supported on an articulated peduncle of three pieces, of 

 which the first is the shortest ; the eyes mottled ; the corslet 



