170 SUPPLEMENT. 



lengths and sizes, exquisitely ringed ; they form a sort of 

 chevaux de frise: foot finger-shaped, extensile, with a brownish 

 nucleus : liver scarlet-red. 



F. Norway, Vienna basin, Italy, and Ehodes! E. Atlantic 

 coasts of France, and both sides of N. America. Arctic spe^- 

 cimens are more than twice the size of ours. L. nivea (if 

 Kenier's species) has no furrow ; it occurs with L. subauricu- 

 lala in the Coralline Crag at Sutton (as L. ovata, S. Wood), 

 the Vienna basin, and at Monte Mario and Ancona ! Eenier 

 (not Renieri, as erroneously spelt by some writers) did not de- 

 scribe his Ostrea nivea ; he merely added to the name the fol- 

 lowing note : " Prossima all' Ostrea inflata di Gmelin e all' 

 Ostrea bullata di Born." It appears to be the 0. nivea of 

 Brocchi, judging from his description and figure ; although he 

 perhaps united L. subauriculata with it, and referred to L. 

 elliptica as a living species and half an inch long. 



P. 85. L. LOSCOMBII. F. Norway, Italy, and Rhodes ! 



P. 87. L. HIANS. F. Glacial bed, Errol (Crosskey)!; 

 Monte Mario and Messina ! 



P. 89, 1. 4 and 5 from bottom. The filaments or tentacles 

 are not prehensile ; and the Limce feed on animalcula. Prof. 

 Lacaze-Duthiers described the " nest " or " gite " in the ' An- 

 nales des Sciences Naturelles' for December 1865; he evidently 

 was not aware that this had been previously done. 



p. 96. AVICTJLA HIRUNDO. Falmouth (Hockin). F. Italy. 

 E. Atlantic coasts of France and Spain. The fry, scarcely half 

 a line in length, is even more inequivalve than the adult ; the 

 wing-like process at the broader end is not developed in the 

 earlier stages of growth, and the beak or umbo is very promi- 

 nent. 



P. 99. PINNA RUDIS. The animal is marvellously small in 

 bulk or weight in proportion to the shell, and when dead does 

 not occupy the twentieth part of it. The anterior or front 

 muscle forms a huge bundle, of the thickness of a man's thumb, 

 and holds the valves in position. It is by this muscle that the 

 long-line fisherman hooks the Pinna, and detaching it from 

 the byssus drags it up from its bed. Poli, Costa, and many 

 other authorities regarded our species as the rudis of Linne, 



