330 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



PORTUNUS ARCUATUS. 



Portunus arcuatiis, Leach, Malac. Brit. pi. vii., figs. 5, 6. — 



Bell, Brit. Crust, p. 97. 

 Portunus emarginatus, Leach, I.e. pi. vii., figs. 3, 4 (Var.) 

 Portunus Rondeletii, Risso, Crust, de Nice t. i., fig. 8. — M. 



Edw., Hist. Nat. des Crust, i., p. 444. 



Firth of Clyde, in the coralline zone (Norman). 

 Off Cumbrae, not rare (Robertson). Lanilash Bay 

 (Herdman). We obtained a young specimen of the 

 var. emarginatus off Farland Point, Cumbrae, 12 

 fathoms. 



PORTUNUS DEPURATOR. 



Cancer depurator, Linn., Syst. Nat. xii., p. 1043, 23. 



,, ,, var., Penn., Brit. Zool. iv., pi. iv., fig. 6a. 



Portunus ,, Leach, Edin. Ency. vii. 390.— Bell, Brit. 



Crust, p. 101. 



Portunus plicatus, Risso, Crust, de Nice p. 29.— M. Edw., Hist. 

 Nat. des Crust, i., p. 442.— White, Pop. Hist. Brit. Crust, p. 50. 



Abundant on hard ground, in 5-30 fathoms. This 

 is certainly the commonest species of swimming- 

 crab in the Firth of Clyde. We took females with 

 ova in July. 



PORTUNUS MARMOREUS. 

 Cancer depurator? Penn., Brit. Zool. iv., pi. ii., fig. 6. 

 Portunus marmoreus. Leach, Malac. Brit. pi. viii. — Bell, Brit. 

 Crust, p. 105. 



Taken in several localities, usually along with the 

 last species, but much less common. 



PORTUNUS PUSILLUS. 

 Portunus pusillus, Leach, Malac. Brit. pi. ix., figs. 5-8. — Bell, 

 Brit. Crust, p. 112. 

 Portunus maculatus, Risso, Hist. Nat. de I'Eur. M^r. t. v., p. 5. 



Abundant everywhere on hai'd ground, as far up 

 as the Gareloch, in 5-40 fathoms. 



Family PLATYONYCHIDAE. 

 Genus Carcinus, Leach. 



CARCINUS MAENAS. 



Cancer maenas, Linn., Syst. Nat. 1043. — Penn., Brit. Zool. iv., 

 p. 3., pi. iii., fig. 5. 



Carcinus maenas. Leach, Edin. Ency. vii., p. 429. — Bell, Brit. 

 Crust, p. 76. 



