OF SOUTH DEVON. 287 



P. Modioli, (Montagui). Eclinb. Ency. 



P. Latreillii. ' Diet, des Sciences Nat.' xxviii. 



Section 4. Orbiculata, have the carapace rhomboidal or 

 ovoid, always solid ; eye-pedicles short ; claws of unequal 

 length in the males and females, longest in the former ; third 

 articulation of the exterior jaw-feet always an elongated tri- 

 angle. 



Corystes, sub-genus. 



C. cassivelaunus, Pennant; (personatus, Herbst.) Found on our sandy 



shores, and sometimes thrown up during storms. We have two males 



and two females in our Museum. 

 Leucosia, {Ebalia, Leach), sub-genus. 



L. Pennantii. We have three specimens, obtained by Mr. Prideaux at 



Salcombe. 

 L. Cranchii. Two specimens in our collection, obtained in Plymouth 



Sound by Mr. Prideaux. 

 L. Bryerii. One specimen, obtained with the trawl at Plymouth, by Mr. 



Prideaux. 



Note. — Ad hoc genus pertinent species indigent Cancer tuberosus, Pen- 

 nant, ' Brit. Zool.' iv., et Can. tumef actus, Mont, 'Lin. Trans.' ix. (Leach, 

 1 Linn. Trans.' xi.) 



Section 5. Trigonia, have the carapace triangular, pointed 

 anteriorly, and generally irregular and rough ; claws, espe- 

 cially of the males, always large and elongated, the last arti- 

 culation of the exterior jaw-feet always nearly square, or 

 hexagonal : segments of the tail seven or less : many of them 

 are called " sea-spiders." 



Parthenope, {Eurynome, Leach), sub-genus. 



P. aspera. We have eight specimens of this crab, all young, sent by Mr. 

 Prideaux from Bantham ; who has also obtained them by the trawl in 

 Plymouth Sound. 

 Pisa, sub-genus. 



P. Gibbsii. First found in Devon by Montagu, 'Linn. Trans.' vol. xi. 

 Five specimens in our Museum were obtained at Plymouth and Ban- 

 tham by Mr. Prideaux ; they have also been found by Mr. Couch at 

 Polperro, Cornwall. 

 P. Tetraodon, (Blastus, Leach). One specimen sent by Mr. Prideaux, 

 who informs me that it was also found by Dr. Leach at Teignmouth. 

 Maia, sub-genus. 



M. squinado, Thomback or King Crab ; Corwich Crab, (Cornwall) ; Spi- 

 der Crab of the Plymouth fishermen. We have several specimens ; it 

 is common here, and is occasionally eaten, though its forbidding aspect 

 prevents its general use. It is always destroyed when caught, as the 

 fishermen imagine it deters the edible crab from entering the crab-pots. 

 Hyas, sub-genus. 

 H. araneus. Three specimens in our Museum from Plymouth Sound, 



obtained by the trawl. 

 H. coarctatus. Plymouth Sound and Salcombe ; Leach, 'Linn. Trans.' 

 xi., 239. 



