26 THE INVERTEBRATE FAUNA 
ECHINOIDEA. 
ECHINID A. 
Echinus esculentus (Penn. sp.). 
Firth of Forth (£. #.); Firth of Forth 
(MB.). 
We have followed Professor Alex. Agassiz’ 
nomenclature of this species, which is the 
LE. sphaera of Forbes. It is our most com- 
mon sea-urchin, and occurs from between 
tide marks to the greatest depths in the 
Firth. We often dredged it on the banks 
around Inchkeith, and at various other 
places. 
E£, miliaris (Linn.). 
Firth of Forth (Zd. Mus.). 
We have never found this species in the 
littoral zone, but have obtained it at 5 
fathoms off Inchkeith, and in the north 
channel in 18 fathoms. 
Strongylocentrotus drébachiensis (O. F. Miill.). 
The Echinus neglecta of Forbes. Mr F. M. 
Balfour has found this species on a muddy 
bottom, at 30 fathoms, near the mouth of 
the estuary. 
CLYPEASTRIDA. 
Echinocyamus pusillus (Miill.). 
We found some dead specimens on the 
shore at Largo, and have dredged it. Mr F. 
M. Balfour found it common near Dunbar. 
SPATANGID. 
Spatangus purpureus (Leske). 
Leith shore (2. J.); Firth of Forth (7lem.) ; 
Firth of Forth (J/B.). 
Not uncommon. We have frequently 
dredged it in 5 to 12 fathoms. 
