288 CATALOGUE OF THE MALACOSTRACA 



Inachus, sub-genus. 



I. Dorsettensis. Found in deep water at the mouths of rivers. We have 



three specimens from Salcombe ; Mr. Prideaux. 

 I. dorhynchus. Discovered by Dr. Leach among some of the preceding 

 species from Kingsbridge estuary. Mr. Couch says it is common in 

 Cornwall. 

 I. leptorhynchus, (Leach, ' Mai. Brit.') We have two specimens from 

 Mr. Prideaux, taken in Bigbury Bay. 

 Ach^us, sub-genus. 



A. Cranchii, (Leach, ' Mai. Brit.' 22). Found, though rarely, in Devon 

 and Cornwall. 

 Stenorhynchus, (Macropodia, Leach), sub-genus. 



S. tenuirostris. Plymouth Sound. We have four Devon specimens ; it 

 is also common in Cornwall, according to Mr. Couch. 



Family 2. Decapoda macroura, or long-tailed Decapods. 

 Genus ASTACUS. 



Section 1. Anomala, have two or four hind feet, always 

 smaller than those which precede them ; the under part of the 

 tail never displays more than four pairs of appendices or false 

 feet, the lateral fins at the end of the tail do not form, with 

 the last segment, a fan- shaped extremity. 



Pagurus, sub-genus. * 



P. Streblonyx ; {Cancer Bernhardus, Linn.) ; Hermit or Soldier Crab. — 

 Common on our coast. We have several small specimens correspond- 

 ing to the description of Pag. araneiformis, but which Dr. Leach con- 

 siders to be the young of the former. Mr. Prideaux tells me that he 

 found two different species on this coast, one of which has been named 

 after him by Dr. Leach. 

 P. Prideauxianus t Leach, ' Diet, des Sciences Nat.' tome xxviii. 



Section 2. Locustce, have only four pairs of false feet, the 

 posterior extremity of the fin forming the tail is always more 

 membranous than the rest; all the feet are nearly alike, and 

 pointed at the end ; the thorax is almost square, without any 

 lance-shaped prolongation. 



Scyllarus, sub-genus. 



S. tridentatus. In the collection of Mr. Comyns, of Dawlish, Edin. En. 

 vii. 397 ; but I am doubtful if it is a Devonshire specimen. 

 Palinurus, sub-genus. 

 P. quadricornis, (Fab.) ; Thorny Lobster, or Sea Cray-Fish. This spe- 

 cies is sold in our markets under the name of "Crawfish." It is very 

 common : we have one specimen in the Museum. 



Section 3. Astacini, are distinguished from the preceding 

 by the form of the two anterior feet, which terminate by a di- 

 dactylous hand ; the extremity of the tail is fan-shaped ; the 

 thorax is narrow in front and the forehead more or less pointed. 



Galathjea, sub-genus. 



G. spinigera, oxstrigosa, (Leach); Plaited Lobster. Mr. C. Prideaux has 



