HOPLOPARIA. 2? 



• 

 other, 2 5 inches; height 1 inch; length of rostrum 1-1 inch; length of larger hand 1*2 



inch; of ringers of the same 1 inch; length of smaller hand 09 inch ; of fingers of the 



same 1*9 inch. 



Found in the Greensand at Lyme Regis, and at Atherfield, in the Isle of Wight, from 



both which localities there are numerous specimens in the British Museum, and in 



Dr. Bowerbank's collection. 



Obs. In 1826 the late Mr. George Sowerby published in the ' Zoological Journal' an 

 account of this species, to which he gave the name of Astacus longimanus. The 

 specimens described were received through the late Sir Henry de la Beche from the Green- 

 sand of Lyme Regis. Since that time several other specimens have been obtained from 

 the same locality, which have enabled me greatly to enlarge the description of the species. 

 Prof. M'Coy very properly considered it as generically distinct from Astacus, and 

 associated it with two species from the London Clay under the present name. 



Hoploparia punctulata, mild. Plate V, figs. 11 — 13. 



Testa regionibus valde distinctis ; lobo epigastrico granuloso, scabriusculo ; proto- 

 gastrico forte bituberculato ; abdomine minute punctato. 



Descr. There are in the British Museum and in Dr. Bowerbank's collection, several 

 specimens of a species of Hoploparia nearly allied to H. longimana, but possessing 

 characters which, on very careful consideration, and after some hesitation, I have con- 

 sidered sufficient to determine its specific distinction. It agrees with that species in the 

 general character of the surface of the legs and of the posterior portion of the carapace, as 

 well as in the smoothness of the abdomen and in the important character of its punctate 

 surface ; but it differs considerably in the more scabrous surface of the anterior part of the 

 carapace, in the much more distinct demarcation of the regions, in their greater compara- 

 tive shortness, and in the existence of two very prominent tubercles on the protogastric 

 lobe, which in H. longimana are replaced by a small carina ; the hands, also, are more 

 nearly of a size, shorter in proportion, and more rounded. This view of the distinctness 

 of the species is strengthened by the fact of its having been found exclusively in the 

 Gault, whilst the true H. longimana is found only in the Greensand of Lyme Regis and of 

 Atherfield. 



Hoploparia granulosa, mild. Plate VII, figs. 1, 2. 



Testa cylindracea, omnino granulata, scabriuscula, sulco iineari continuo a rostro usque 

 ad marginem posteriorem testae. 



