COOKE : ON THE MACANDREW COLLECTION. 353 



Donax anatinus Lam. Dogger Bank, 15 f. 



The var. nitida of Jeffreys. 

 D. politUS Poli. Bantry. 



Not a very representative set. Very common at 

 Herm, where I have taken it living at low water mark 

 spring tides. 

 Ervilia castanea Mont. Cornwall. 

 Fourteen single valves. 

 Mactra solida L. Anglesea, &c. 



The largest specimen is 2 "4 inches broad by i"8 long. 

 - Another on the same card, which however belongs to 

 var. ti-uncata Mont., is 2*25 inches broad by 2T5 long. 

 M. solida L. var. truncata. No locality. 



Not labelled hitherto. 

 M. solida L. var. elliptica Brown. Anglesea, &c. 



More usually known as M. elliptica. 

 M. subtruncata DaCosta. Ardrossan. 

 M. subtruncata DaCosta var. striata Brown. No locality. 



Not labelled hitherto. 

 M. stultorum L. Anglesea, &c. 

 M. stultorum L. van cinerea. Anglesea, &c. 

 M. glauca Born. South of England. 



Not a good specimen. I have taken it alive at 

 extremely low tides at a particular spot in Herm with 

 Solen siliqua, the only way of distinguishing their lurking- 

 places being that the Solen made an oval, but the Mactra 

 a round hole over its burrow in the wet sand. 

 Lutraria elliptica Lam. Torbay, &c. 

 L. elliptica Lam. var. Bantry. 



This may be the var. alternata of Jeffreys. 

 L. oblonga Chem. No locality. 



Two rather poor specimens. 



