286 CATALOGUE OF THE MALACOSTRACA 



P. lividus. One Plymouth specimen in our Museum, from Mr. C. Pri- 

 deaux, by the trawl ; others have been obtained by Montagu. 



P. emarginatus. One specimen found at Torcross ; (Leach, ' Lin. Tran.' 

 vol. xi., and Edinb. Ency. vii., p. 390). Mr. Prideaux tells me it was 

 also obtained in Plymouth by Gibbs. 



P. pusillus. Two Devon specimens in our Museum from Mr. C. Pri- 

 deaux. 

 Platyonichus, sub-genus. 



P. variegatus , (Portumnus of Leach, whose designation is changed by 

 Cuvier, from being " trop rapprochee du mot Portune, deja employee." 

 It is said to be very common on our sandy shores ; (' Linn. Trans.' xi. 

 314). Mr. Prideaux informs me it is found in Bigbury Bay. 



Section 2. Arcuata, have the shell arched anteriorly, and 

 all the feet pointed. 



Cancer, sub-genus. 



C. pagurus, Common Market Crab. Museum of the Plymouth Institu- 

 tion. Large quantities of these are caught in crab -baskets along our 

 coast, from Plymouth to Torbay, the majority of which are picked up 

 by the passing steam boats, and conveyed to Portsmouth and London 

 for sale. 



C. poressa, Oliv., (Xantho Jlorida, Leach). Common in South Devon ; 

 we have several specimens. 

 Pi rime la, sub-genus. 



P. denticulata. Rare ; we have three specimens, sent by Mr. Prideaux 

 from Bantham. Mr. Couch finds them in Cornwall, though rarely. 

 Atelecychus, sub-genus. 



A. septemdentatus. Found frequently in Plymouth sound by Mr. Cranch, 

 Edinb. Ency. vii. 430. A male and female are in our Museum, sent 

 by Mr. Prideaux. 



Section 3. Quadrilatera^ having the carapace square or 

 heart-shaped, with the front prolonged, inflected, and form- 

 ing a sort of hood ; tail of seven segments ; eyes on thick 

 pedicles. 



Pilumnus, sub-genus. 



P. hirtellus. Obtained only in South Devon, Leach, Edinb. Ency. vii., 

 391. It is rare here, we have only three specimens from Mr. C. Pri- 

 deaux, obtained at Bantham. Mr. Couch states that in Cornwall they 

 are frequently found in crab-pots at from 4 to 6 fathoms water. 

 Gonoplax, sub-genus. 



G. bispinosa. Abundant in Salcombe Bay (Montagu), and in Plymouth 

 Sound (Leach, 'Linn. Trans.' xi.) We have four specimens, and there 

 are others in the possession of different collectors in the town. 

 Pinnotheres, sub-genus. 



P. varians. One Devon specimen is in our Museum, found by Mr. Pri- 

 deaux in a Cardium. The Pin. pisum (Mytilorum, Latr.) appears to 

 be the female, (see ' Diet, des Sciences Nat.' t. xxviii, 238), of which 

 we have four specimens. 



P. veterum. Of this we have one Devon specimen. Mr. Prideaux has 

 found them in oysters as well as Pinnce ; the Pin. pinna appears to be 

 the same, and was found at Salcombe, Devon, by Montagu and Cranch, 

 Edinb. Ency. vii. 431. 



P. mytili, (Cranchii P). Kingsbridge, Devon ; Edin. Ency., vii. 430. 



