108 Proceedings of the Royal Physical Society. 



Sub-Class I. MALACOSTRACA. 



Order 1. PODOPHTHALMA. 



Suborder Braehyura. 1 



Family Cancrid^. 



Genus (1) Cancer, Linne, 1767. 



1„ Cancer pagurus, Linne. 



1767. Cancer pagurus, Linn., Syst. Nat., ed. xii., vol. i. p. 1044. 



Habitat — Firth of Forth, from inshore to moderately deep 

 water. Specimens have occasionally been captured in the 

 trawl-net of the Fishery steamer " Garland," at all the 

 experimental stations from above Queensferry to the mouth 

 of the estuary. 



Family Portunidji. 

 Genus (2) Carcinus, Leach, 1813. 



2. Carcinus mmnas (Linne). 



1767. Cancer mcenas, Linn., Syst. Nat., ed. xii., vol. i. p. 1043. 



Habitat. — Common everywhere between tide-marks, especi- 

 ally where the shore is rough and provides suitable shelter ; 

 also occasionally found in moderately deep water. 



Genus (3) Portunus, Fabricius, 1798. 



3. Portunus puber (Linne). 



1767. Cancer puber, Linn., Syst. Nat., ed. xii., vol. i. p. 1046. 

 Habitat. — Taken at the mouth of the estuary on deep-sea 

 lines (Leslie and Herdman). This appears to be, so far, the 

 only published record of this species for the Firth of Forth. 



4. Portunus depurator (Linne). 



1767. Cancer depurator, Linn., Syst. Nat., ed. xii., vol. i. p. 1043. 

 Habitat. — Common throughout the estuary, and frequently 

 associated with P. holsatus. 



1 In the nomenclature of this suborder, BelL's British Stalk-eyed Crustacea, 

 1853, has been generally followed. 



