314 GASTEROPODES. 
13. Eouts parititosa.—Plate XLV. Figs. 23, 24, 25, 26, 27. 
This species having been frequently the subject of observation and 
discussion, since first noticed by Baster in 1759, it is unnecessary for 
me to speak of it in much detail. But I cannot coincide with that 
author, in viewing it as one of the deformities of the creation :—“ Doris 
hee animal deforme est, et foedum aspectu ;” for it has been to mea 
curious and interesting creature, when contemplating its history. There 
is one advantage also in its dimensions. From being the third largest of 
the whole tribe inhabiting Scotland, and the largest of its own particular 
kind, the Eolis, it may be very conveniently assumed as the type ; while 
the size of all its parts admits a ready field for anatomical investigation. 
The finest specimen I ever saw was brought by Robert Wilson. 
Crawling, it extended completely four inches from the tip of the tentacula 
to the extremity of the tail, which, for about half an inch, is quite bare 
beyond the branchis, being a continuation of the bare portion of the 
back. The colour of the skin of this animal is formed from an inter- 
mixture of brownish, greyish, and reddish ; the branchiz very numerous 
and very fine, of somewhat the same appearance. I never saw a finer 
animal. 
Length two and a half inches from the front of the head to the pos- 
terior extremity ; breadth of the sole eight lines ; shoulder elongating in . 
a triangular pointed organization, exhibiting somewhat of a tentacular 
faculty. Tentacula and cornicula each extending about three lines, the 
latter cylindrical, obtuse, and so close together as almost to fork from a 
common root. Head round, presenting, with the divergence of the long 
pointed tentacula, exactly the semblance of the head of an ox. Dr John- 
ston remarks, “‘ Head depressed ; the mouth terminal, sub-inferior, en- 
circled with a dilatable lip, and furnished with a very short proboscis, 
which contains a pair of rather large, thin, oval, corneous jaws.” — 
Magazine of Natural History, vol. viii. p. 317. 
A black speck, deeply seated in the flesh, appears behind each cor- 
niculum, which seems compound. Similar specks are seen in others ; 
