19T 



Purpura. 

 P. lapillus. On rocks, between liig'li and low water. 

 P. Variety, imbricata. Fine specimens, around Salcni, 



Bnccimim. 

 B. plicosum. Found in City-Mill pond, Salem. 

 B. undatum. At Salem Neck, and beaches at Lynn. 

 B. trivittatiim. Salem Harbor and beaches at Lynn. 

 B. obsolctum. Plenty in City-Mill pond. 

 B. rosaceum. At Point Beach, Swampscott. 



B. lunatum. At Phillips Beach among roots and kelp. 



Colum1.)ella. 



C. avara. Found on the beach at Swampscott. 



C. Gouldiana. Found on Phillips Beach among roots 

 of kelp, and near City-Mills in Salem. 



Hiatella. 

 H. arctica. Found at Phillips Beach among sea-Aveed, and 

 among Balanus elongatus, on the bottom of a schooner from 

 the Grand Banks. I have observed a fine line armed with 

 spines, running from the beak to the posterior end of the 

 shell. 



Fridajj, June 5tk, 1857. 



Field Meeting at South Danvers. — This being the first 

 meeting of the season, a large party taking the cars of the 

 South Keading Branch Pailroad, at ten o'clock in the fore- 

 noon, embraced the opportunity of visiting Ship Rock, and 

 proceeding thence to the place of rendezvous through the 

 woods, or by whatever path fancy or inclination dictated, ar- 

 rived at the Aims-House, where numerous attentions in the 

 way of guidance to picturesque spots and wild and steep 

 places in the neighboring woods, Avere rendered by Mr Adino 

 Page. Ship Rock itself, is one of the largest fragments of 

 sienite of a particular formation, which lie scattered round 

 the area of a circumscribed range. Seen from a distance, 

 its sharp outline rises from among the trees and lifts itself 

 visibly high above them. At some no very distant period, a 

 large scaly fragment having detached itself, remains of a 



