Verrill.] 342 



Synapta tenuis Ayres, these Proc. iv, p. 11, Feb., 1851. 



Synapta Girardii Pourtales, Proc. Am. Assoc. 1851, p. 14. 

 Synapta tenuis A. and E. C. Agassiz, op. cit. p. 95, figs. 124, 125. 



At low-water mark, sandy shores, Sag Harbor, L. I., Dr. Ayres. 

 Also in Massachusetts Bay. 



Sclerodactyla Briareus Ayres, op. cit. p. 6. 



Holotliuria hriareus Lesueur, Jour. Phil. Acad, iv, p. 161, 1824. 

 Anaj)erus carolinus Troschel Anaperus carolinus and A. Bryareus 

 Pourt. 1. c. p. 10. 



Sag Harbor, L. I., among eel-grass on muddy shores, Dr. Ayres. 

 New Jersey, Say; S. Carolina and Florida. Lesueur's specimens were 

 from Florida. Possibly two species are confounded under this name. 

 I have seen no Florida specimens. 



ACADIAN FAUNA. 



The following list embraces all the species known to me inhabiting 

 this fauna, as Umited above. The species that have been found only 

 in deep water (below thirty fathoms) off the coast of Maine, and at 

 St. George's Bank, are included in the Syrtensian fauna. 



Polypi. 



For the synonymy and descriptions of all the following species, as 

 ■well as more complete notices of localities, reference may be had to 

 my Revision of Polyps, etc., Memoirs of this Society, Vol. i, 1864. 



Bunodes stella Verrill. 



Cape Elizabeth, Me., to Grand Menan. Littoral. 



Rhodactinia (Tealia) Davisii Agassiz. 



South Shoals, Mass., to La.brador. Littoral to thirty-five fathoms. 

 A comparison of living specimens may, quite probably, estabUsh 

 the identity of this species with T. crassicornls of North Europe. 



Metridium marginatum Edw. and H. 



New York to Labrador. Littoral to thirty fathoms. 



Ilyanthus Isevis Verrill. 

 Eastport, Me. 



