314 GASTEROPODES. 



13. EOLIS PAPILLOSE 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 

 htec animal deform e est, et foedum aspectu ;" for it has been to me a 

 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 Eon's, 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 branchiae, 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 branchiae 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 ; 



