PLYMOUTH MAIUNE IXVERTEBKATE FAUNA. 287 



[ Pelecypoda — contd.] 



Pinna fkagilis, Pennant : J. G. JeJ'rei/s, Brit. Concli., vol. ii, p. 99, fig. 

 (as F. rudk). 



Small specs, are occasionally taken on gravel otl' Eanie Hd., 

 20-30 fms. ; dead shells are common (r.a.t.) : Queen's Gd. ; Stoke 

 Pt. Gds., etc. ; small specs, only (s.P.). 



Ostreidae. 

 Ostrea EDULIS, Linnfcus : J. G. Jeffreys, Brit. Conch., vol. ii, p. 38, fig. 

 Millbay Ch. ; Queen's Gd. ; Mewstone Ledge ; Yealnl R. ; stray 

 specs, occasionally dredged (k.a.t.) : inside the Bridge (s.P.^). 

 Extensive oyster-beds are cultivated in the Tamar P. at Saltash, 

 and in the Yealni E. (e.j.a.). 



Pectinidae. 

 Pecten maximus (Linnaifus) : /. G. Jeff'rei/s, Brit. Conch., vol. ii, p. 73, fig. 

 Mewstone 'Echinoderm' Gd., not uncommon; Rame-Eddystone 

 Gds., etc. (r.a.t.) : Eddystone Gds., moderately abundant on the 

 various gravel grounds (e.j.a., s.p.) : Mewstone Ledge ; Asia Sh. ; 

 Yealm Sand-bank, between tide-marks^ (r.a.t.). 

 Pecten (Hinnites) pusio (Linnaeus) : J. G. Jeffreys, Brit. Conch., vol. ii, 

 p. 51, fig. 



Not uncommon on all rocky shores, among stones, inside dead 

 shells, etc., L.W.-30 fms. (s.P.) : Drake's L ; Asia Sh. ; Queen's Gd.; 

 the Breakwater; etc. (r.a.t., s.p.). 

 Pecten (Chlamys) varius (Linnaeus) : ./. G. Jeffreys, Brit. Conch., vol. ii, 

 p. 53, fig. 



The Breakwater, not uncommon at low tide ; occasional specs, 

 from Drake's L, Asia Sh., Queen's Gd., Rum B., Yealm R. (r.a.t.). 

 Pecten (..Equipecten) opercularis (Linnaeus) : /. G. Jefreys, Brit. 

 Conch., vol. ii, p. 59, fig. 



More or less common everywhere in 15-30 fms., especially on 

 the Mewstone 'Echinoderm' Gd. and about 5 m. S.W. of Penlee Pt. ; 

 occasionally from Queen's Gd. and Asia Sh. ; the Breakwater, single 

 small spec, between tide-marks (r.a.t.) : Eddystone Gds., more or 

 less abundant on all the grounds, often in beds which, while of 

 limited extent, contain very numerous individuals (e.j.a., s.p.). 

 Breeding: June-Aug. (s.p.). 

 Pecten (Palliolum) tigerinus (Miiller): K Forbes & Hanky, Hist. Brit. 

 Moll., vol. ii, p. 285, fig. 



Not uncommon on coarse muddy or sandy gravel : Stoke Pt. 

 Gds.; Rame-Eddystone Gds.; etc. (s.p.): Mewstone ' Echinoderm ' 

 Gd. (r.a.t., s.p.) : Eddystone Gds., not abundant, for the most part 

 on coarse ground (e.j.a.) : the Breakwater, single spec, between 

 tide-marks (r.a.t.). 



Limidae. 

 Lima iiians (Gmelin) : J. G. Jeffreys, lirit. Conch., vol. ii, p. 87, fig. 



Abundant at extreme low tide among a small patch of stones 

 with muddy gravel on the N. side of the Breakwater ^ ; Reny Rks.^ 

 (R.A.T.) : Drake's L (s.P.^). 



