BIOLOGICAL SURVEY OR WOODS HOLE AND VICINITY. 
735 
Mustelus canis — Continued. 
Throughout the region, very abundant in shal- 
lower waters, on all kinds of bottom. Taken 
in traps (sometimes ioo or more at once) and 
on lines; occasionally in the seine. Present 
from May to November, but most abundant in 
June. 
Females containing eggs and embryos taken 
throughout the summer. Bumpus believes 
that there are probably two broods, in June and 
August, respectively. Thompson reports the 
capture of three females containing 27 em- 
bryos, 10 to 11 cm. long as late as about Sep- 
tember 25. 
Food: Homarus americanus, Libinia emarginata, 
Cancer irreratus. — Verrill and Smith. Mostly 
crabs. — H. M. Smith. Usually crabs ( Pano - 
pens, Ovalipes, Cancer, Libinia, etc.), also 
squid, annelids, and fish.— Linton. In order 
of frequency: Cancer irroratus, Libinia emar- 
ginata, Homarus americanus, fishes (men- 
haden, puffer, scup, pipefish, sculpin, stickle- 
back), Ovalipes ocellatus, Loligo pealii, Nereis 
(mostly N. virens), eelgrass ( Zostera marina), 
Pagurus pollicaris, Ensis directus, Upogebia 
affinis, Panopeus depressus, Palcemonetes vul- 
garis, airrphipods, small gastropods. — I. A. 
Field. 
Parasites: Nematodes (Linton) — Ascaris sp. Ces- 
todes (Linton) — Calliobothrium eschrichtii, C. 
verticillatum, Dibothrium sp., Otobothrium cre- 
nacolle, Phyllobothrium loliginis, Rhyncho- 
bothrium bulbifer, R. heterospine, R. lomenta- 
ceum, R. tumidulum, Synbothrium Jilicolle, 
Tetrarhynchus sp. Copepods (C. B. Wilson) — 
Alebion gracile, A. glabrum, Pandarus sinuatus. 
Galeocerdo tigrinus Muller & Henle. Tiger shark. 
Baird, 1873; Verrill and Smith, 1873, p. 521; 
Goode, 1884, p. 673; Jordan and Evermann, 
1896, p. 32; H. M. Smith, 1898, p. 88; Linton, 
1901, p. 425; Kendall, 1908, p. 3. 
Woods Hole, 1871. — Goode. Vineyard Sound 
and Buzzards Bay, in traps, occurring from 
August till October, rarely before August; 
present every year in variable abundance. — 
Smith. Formerly more common. — Edwards. 
Food: Buccinum undatum and Lunatia heros . — 
Verrill and Smith, Goode. Fish (menhaden 
and bonito), Busycon canaliculatum and 
squid. — Linton. 
Parasites (Linton): Nematodes — Acanthocheilus 
nidifex, Ascaris brevicapitata. Cestodes — -Cross- 
obothrium angustum, Monorygma sp., Orygma- 
tobothrium paulum, Synbothrium Jilicolle, Tet- 
rarhynchus bicolor, Thysanocephalum crispum. 
16269° — Bull. 31, pt 2 — 13 13 
Prionace glauca (Linnaeus). Great blue shark. 
Jordan and Evermann, 1896, p. 33; H. M. Smith, 
1898, p. 88; Sharp and Fowler, 1904, p. 503; 
Kendall, 1908, p. 4. 
Buzzards Bay, at breakwater, one taken in July, 
1877. One 70 cm. long taken at Menemsha 
Bight, August 4, 1905 (collected by Edwards, 
identified by Osbum, Cole and Sumner). 
Another, which was reported to be about 12 
feet long, was taken in a trap at the same 
point August 21, 1906; and large specimens 
were reported during the summers of 1907 and 
1908, three being taken in the latter year. — - 
Edwards. Nantucket. — Sharp and Fowler. 
Parasites (Linton): — Anthrobothrium laciniatum, 
Crossobothrium angustum. 
Carcharhinus obscurus (Le Sueur). Dusky shark. 
Verrill and Smith, 1873, p. 520 ( Eulamia ob- 
scura); Bean, 1884 ( Carcharias obscurus)-, Jor- 
dan and Evermann, 1896, p. 35; H. M. Smith, 
1898, p. 88; Linton, 1901, p. 426; Sharp and 
Fowler, 1904, p. 505: Kendall, 1908, p. 4. 
Vineyard Sound and Buzzards Bay, common. 
Present from June 1 through part of Novem- 
ber; taken in traps and on lines. — Smith. 
Not so abundant as formerly. — Edwards. 
Food: Homarus americanus, Cancer irroratus . — 
Verrill and Smith. Fish (menhaden and 
squeteague ) . — Linton . 
Parasites: Acanthocephala (Linton)— Echinor- 
hynchus claveeceps. Cestodes (Linton) — Antho- 
bothrium laciniatum, Crossobothrium angustum, 
Discocephalum pileatum, Otobothrium crena- 
colle, Phoreiobothrium lasium, P. triloculatum, 
Platybothrium cervinum, Rhynchobothrium spe- 
ciosum, R. tumidulum, Synbothrium Jilicolle, 
Tetrarhynchus bicolor, T. bisulcatus, T. robus- 
tus, T. sp. Trematodes (Linton) — Gasterosto- 
mumarcuatum. Copepods(C. B. Wilson) — Ale- 
bion gracile, Pandarus smithii, P. cranchii, 
Perissopus communis . 
Carcharhinus milberti (Muller & Henle). Blue 
shark. 
Verrill and Smith, 1873, p. 521 ( Eulamia mil- 
berti)-, Baird, 1873 ( Eulamia milberti)-, Jordan 
and Evermann, 1896^.37; H.M. Smith, 1898, 
p. 88; Linton, 1901, p. 426;Kendall, 1908, p. 4. 
Four specimens about 4 feet long taken in a trap 
near the local breakwater, August 8, 1873. — 
Smith. None seen since. 
Food : One specimen contained a large quantity 
of Yoldia sapotilla. — Verrill and Smith. Bo- 
nito. — Linton. 
Parasites (Linton): Immature nematodes; ces- 
todes — Anthobothrium laciniatum, Crossoboth- 
rium angustum, Monorygma sp., Phoreioboth- 
rium lasium, Platybothrium parvum, Rhyncho- 
bothrium tenuispine. 
