[Reprinted from ‘* The Annals of Scottish Natural History,” January 1892. | 
MOS ON SOME SCOTTISH. ECHINODERMATA, 
by iomAs Scorn, EIL:S., 
Naturalist to the Fishery Board for Scotland. 
PEATE LE 
I. On a Depressed Form of Echinus eseculentus, Zz77. 
A MORE than usually depressed form of Achinus esculentus 
was obtained in the Firth of Forth in June last (1891), which 
it may be of interest to notice. There is, as is well known 
to students of the Echinodermata, considerable variation in 
in the form of this species, but the variety now under con- 
sideration is the most depressed of the numerous specimens 
I have observed among the captures made during several years’ 
trawling on the east coast of Scotland. In form it approaches 
very closely to Strongylocentrotus drobachiensis, Miiller,—a 
species which we have obtained on one or two occasions in 
the vicinity of Inchkeith, a little east of the south end of the 
the island,"—but is to be distinguished at once by the posses- 
sion of three pairs of pores in the row instead of four or five 
pairs as in Strongylocentrotus. This variety is represented 2 
the natural size on Plate II. Fig. 1, and measures 4.65 inches 
in diameter, and 2.3 inches in height. Fig. 2 represents 
another variety of the same species with somewhat flattened 
sides, which was obtained off Musselburgh at from five to 
six fathoms. Fig. 3 gives us a specimen of the usual form, 
both natural size. These latter figures show by comparison 
more clearly the unusual form of the variety under con- 
sideration : they, also, are represented 2 of their natural size. 
‘II. On Goniaster phrygianus (Pare/ius) = Goniaster equestris, 
Agassiz. 
During the last few years I have obtained two specimens 
of a Goniaster from the Firth of Forth which closely 
resemble each other in form, but which differ considerably 
from specimens of Gonzaster phrygzanus taken in the Moray 
1 Strongylocentrotus drobachiensis is common in the Cromarty Firth, and we 
almost invariably obtain a number of specimens of this species every time we 
trawl between Cromarty and Invergordon. 
