130 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Argina pexata (Say) Gray. Ver., Inv. V. S., p. G92, 1874. Gould, Inv. Mass., II, 

 p. 147, 1870 (Area). 



Collected on the beacb at Proviucetown (S. I. Smith, 1872). 



Mytilus edulis Liund. Gould, luv, Mass., II, p. 183, 1870. Ver., Inv.V. S., p. G9'2, 



1874. 



Yery abundant, shore, piles of wharves, attached to floating fucus, &c. 



Modiola plicatula Lam. Gould, Inv. Mass., II, p. 188, 1870. Ver., luv. V. S.. 

 p. 093, 1874. 



Very abundant on the flats near high- water mark. 



Crenella glandula (Totten) Adams. Gould, luv. Mass., II, p. 194, 1870. Ver., Inv, 

 V.S.,p.C95, 1874. 



A few fresh, but not living, shells were obtained from the beaches at 

 low water. Proviucetown, at low water (Stimjison, Shells of N". Eng- 

 land). This species was first known to Totten, its describer, from Pro- 

 viucetown. 



Pecten irradians Lam. Gould, Inv. Mass., II, i). 199, 1870. Ver., Inv. V. S., p. 695, 

 1874. 



This species was formerly very abundant in front of the town, in the 

 patches of eel-grass just below ordinary low-tide level, but at present 

 the full-grown shells are rarely found there. They are, however, still 

 very plentiful off the dike in similar situations. The adult shells rest 

 on the ground amongst the eel-grass, which at low water becomes 

 thickly matted above them, generally quite concealing them. Young 

 shells usually adhere to the eel-grass by. their byssus. 



Anomia glabra Ver., Am. Journ. Sci., vol. iii, p. 213, 1872; luv. V. S., p. 69(j, 1874. — 

 A. ephipinum, electrica, squamula, Gould {non Liun6). 



Abundant on the flats in front of the dike, but generally of small 

 size, attached to dead shells of Pecten irradians, Ensatella americana, &c. 



TUNICATA. 



Molgula manhattensis Ver., Am. Journ. Sci., vol. i, p. 54, 1871 ; Inv. V. S., p. 699, 

 1874. 



Abundant near high-tide level, amongst the grass in the pools left 

 on the shore at low tide ; attached to eel-grass and to floating sea- weeds. 

 Also thrown up in immense numbers on the outer beach at Race Point 

 during heavy storms. 



Botryllu3 Gouldii Ver., Am. Journ. Sci., vol. i, p. 211, 1871; Inv. V. S., p. 702, 1874. 



Growing on eel-grass in shallow water and on floating sea-weeds, &c. 



BRYOZOA. 



Crisia eburnea Lamour. Ver., Inv. V. S., p. 707, 1874. 



Very abundant on fucus and eel-grass, often associated with Bugula 

 turrita; on eel-grass everywhere in shallow water from the dike to 

 Long Point, and on fucus growing on the piles and floating at the 

 surface. 



