24 THE ZOOLOGIST. 
the drift-nets and tearing them with its teeth. In August, 1906, 
a specimen 7 ft. 10 in. long was killed in Falmouth Bay, and still 
larger examples have been reported. The Tope or Toper (Galeus 
vulgaris, Flem.) is occasionally taken in Mackerel-nets and on 
boulters, chiefly during the summer months. On Sept. 28th, 
1907, one measuring 5 ft. 2 in. in length was caught near the 
outer end of the Manacles, where it was ravenously pursuing a 
shoal of Pilchards. The only specimen of the Hammerhead 
(Zygena malleus, Risso) recorded from the county was taken at 
Newlyn in 1834. The Rough Hound or Murgie (Scylliwm cant- 
cula, L.) is common on sandy bottoms, in sandy “‘ lanes,” and at 
times among low rocks along the south coast, and is occasionally 
taken in the north. It seems to live for the most part at the 
bottom, two or three miles out at sea, but is often taken in drift- 
nets after a storm. The Nurse Hound (S. catulus, Cuv.) is plen- 
tiful along the south, for the most part in deepish waters on a 
rocky ground. It is evidently a bottom-feeder, and is in places 
taken with hook and line asa bait for the Crab-pots. It was 
taken near Sennen in September, 1906, but has been probably 
overlooked on the north coast. The Black-mouthed Dog-fish 
(Pristiurus melanostomus, Bonap.) was taken at Polperro in 1834. 
Dunn f. reports one he saw in an emaciated condition at Newlyn 
in the late spring of 1906. The Smooth Hound (Mustelus vul- 
garis, Muller et Henle) has been obtained on the south coast all 
the year round, but is most plentiful during the months of July, 
August, and September. On the north coast it has been identi- 
fied twice during the last eight years. The Porbeagle Shark 
(Lamna cornubica, Gmel.) is often common in deep waters to the 
south and south-west of the county from early summer into 
autumn, and is at times so troublesome to the Mount’s Bay 
Mackerel fishermen by dashing backwards and forwards among 
the fish that they are obliged to draw in their nets and go else- 
where. The Shark itself is rarely caught except with baited 
lines, for when it gets rolled up in the net it quickly makes a hole 
the size of its head and slips out without causing very serious 
damage to the net. It is occasionally reported from the Bristol 
Channel. Vallentin mentions one caught in St. Ives Bay in a 
Herring-net that measured 8 ft.3 in. The Thrasher (Alopecias 
vulpes, Gmel.) is taken almost every year in the Mackerel- and 
