PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 119 
Pinnixa chetopterana Stimp., Ann. Lyc. N. H., New York, vol. vii, p. 235, 1860. 
Wellfleet, 1879; collected by Prof. H. E. Webster, who found it in 
great abundance in the tubes of Amphitrite ornata, on the flats near the 
town. 
Platyonichus ocellatus Latr. Smith, Inv. V. S., p. 547, 1874; Trans. Conn. Acad., 
vol. v, p. 33, 1879. 
Extremely abundant everywhere along the inner shore, in the vicinity 
of Provincetown, at low water and deeper. Large numbers were ob- 
served to be molting during August and the last of July, and fresh 
exuviw were very common all through the latter half of the summer. 
One small specimen obtained while molting, and preserved in alcohol, 
afforded the following measurements: length of carapax in the exuvia, 
35"™; width, 42™™; length of freshly expanded carapax, partly con- 
tracted in alcohol, 38™™; width, 47™™. The largest specimen taken on 
the shore measured: length of carapax, 71™™; width, 86™™. On August 
16, and during one or more succeeding days, the young were seen swim- 
ming at the surface in countless numbers, but how far from the shore 
they extended was not determined ; they were very plentiful about the 
end of the long steamboat wharf. They varied in length of carapax 
from about 11™™ to 16 ™™, September 3 they were again abundant, but 
less so than on the former occasion, and they remained nearer the shore, — 
or at least closer to the bottom. At this time they were from 18™™ to 
23™™ long. 
Carcinus mznas (Linné) Leach. Smith, Trans. Conn. Acad., vol. v, p. 34, 1879.— 
C. granulatus Smith, Inv. V. S., p. 547, 1374. 
Collected by Smith and Harger, 1872. 
Panopeus depressus Smith, Proc. Bos. Soc. N. H., vol. xii, p. 283, 1859; Inv. V.&., 
p. 547, 1374; Trans. Conn. Acad., vol. v, p. 37, 1879. 
Collected by Smith and Harger, 1872. 
Panopeus Sayi Smith, Proc. Bos. Soc. N. H., vol. xii, p. 284, 1859; Inv. V.S., p. 547, 
1874; Trans. Conn. Acad., vol. v, p. 37, 1879. 
Found abundantly in the eel-grass off the dike, and also collected by 
Smith and Harger, 1872. 
Cancer irroratus Say. Smith, Trans. Conn. Acad., vol. v, p. 38, 1879. 
Common; shore, at low water. 
Libinia emarginata Leach. Smith, Trans. Conn. Acad., vol. v, p. 45, 1879.—L. cana- 
liculata Smith, Inv. V.S., p. 548, 1874. 
Very abundant at low water, Provincetown; several very large males 
were also obtained from Wellfleet Harbor, the largest measuring: 
9 
length of carapax, 113"™; width, excluding spines, 103™™. 
Eupagurus longicarpus (Say) Stimp. Smith, Inv. V. S., p. 549, 1874; Trans, Conn. 
Acad., vol. v, p. 47, 1879. 
Very abundant. 
