PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 117 
order to supply more definite information as to the so-called boundary 
line separating the Northern and Southern New Englaud faun:e. 
tock exposures are entirely wanting about the outer extremity of 
Cape Cod, and the sandy areas which compose the most of that region 
are generally of so pure a character as to offer little inducement to 
animal life in the way of food. The littoral fauna of Provincetown and 
vicinity is therefore less rich in species than a more diverse region would 
be. Nevertheless a more diligent search than has hitherto been insti- 
tuted would undoubtedly result in the finding of many species additional 
to those given below. Prof. H. E. Webster, who spent the entire sum- 
mer of 1879 in collecting and studying especially the shore annelids 
about Provincetown, obtained many new forms not included in this list. 
The localities examined in 1879 were about as follows: The inner 
beach of the cape in front of the town of Provincetown, from the dike on 
the south to Wood End on the north and from high-water to low-water 
mark, including the eel-grass areas lying directly off the beach and the 
broad sand-flats in front of and bebind it; the inner beach at Long 
Point; the piles of the wharves, especially those at the ends of the long 
steamboat and railroad wharves; and the outer beaches at Wood End, 
Race Point, &c. A few interesting species obtained at Wellfleet by 
Professor Webster are included in the list, and I am also indebted 
to him fer material from about Provincetown. The identifications of 
species are only partly mine. Prof. A. E. Verrill furnishes the lists of 
worms and Nudibranchs; Prof. 8. I. Smith has kindly identified the 
Amphipods and more difficult Decapods; and Mr. Sanderson Smith 
the more critical species of Mollusks. Mr. O. Harger has also examined 
the Isopods. In addition to the species contained in the list, a species 
of Chironomus in the larval stage was found abundantly on the shore, 
and one or more species of mites were common among Hydroids. Of 
the one hundred and fifty-seven species included in the list, all but 
twenty-one were previously known to range both to the north and south 
of Cape Cod. Of the species whose range has been extended, thirteen 
belong properly to the fauna of Southern New England and seven to 
that of Northern New England. The southern species are as follows: 
Pallene empusa, Pinnixa chetopterana, Gebia affinis, Mera levis, Micro- 
deutopus grandimanus, Amphithoé longimana, Chelura terebrans, Caprella 
geometrica, Leptochelia algicola, Sigalion arenicola, Sthenelais picta, Antho- 
stoma robustum, and Leptosynapta roseola. The northern species are: 
Leptochelia ceca, Praxilla zonalis, Tetrastemma vermiculus, Planocera 
elliptica, Embletonia fuscata, Stiliger fuscata, and Hdwardsia sulcata. 
The only new littoral species discovered by the Commission, so far as 
the collections have been worked up, is Edwardsia pallida. 
Excepting in a few necessary instances the synonymy of the species 
has been omitted, but references have been given in nearly all cases to 
American publications in which the synonymy and range of the several. 
species and other information concerning them are discussed. 
NEW HAVEN, Conn., April 8, 1880. 
