OTINA. 295 
O. otis, Turton. 
O. otis, Brit. Moll. iii. p. 321, pl. 99. f. 2, 35 (animal) pl. 0.0. f. 4. 
Velutina otis, Auct. 
Animal suboval, auriform, thick, pure white. The mantle 
does not extend beyond the shell, and its margin is plain; the 
head is large, very slightly lobed at its left and right points ; 
the buccal orifice is a vertical fissure at the under surface, 
apparently furnished with teeth, or a short spmous tongue, 
between the usual buccal mass, of a fleshy palate and corneous 
plates, which are visible through the pellucidity of the head of 
the animal, with the csophagus coasting under the lght 
yellow anterior portion of the shell to the stomach. To add 
to the singularity of this curious creature, the head is so 
large, that when viewed through the under part of a watch- 
glass, if the animal is creeping, it has the appearance of a 
third lobe of the foot, and actually assists in locomotion. 
The eyes are large, black, placed on rounded prominences in 
the centre of the head. Another smgular feature is, that not 
even the rudiments of tentacula exist. The foot is of very 
unusual structure, being similar to Adanson’s ‘ Pedipes, and 
to that of Conovulus bidentatus, the configuration of which 
was discovered by me many years ago at Exmouth. We 
refer to the description of the foot of C. bidentatus, which in 
progression and all other points is precisely similar to that of 
Otina otis. The doubtful branchial plume hes under the 
centre of the mantle, evidenced by apparent pectinations, but 
the exact form escaped observation. The animal is not more 
than <!,th or ;th of an inch in diameter; yet there is not a 
point mentioned that admits of doubt, except the precise 
structure of the branchial organ. There is no operculum. 
This animal is found at the roots of the Lichina pygmea, 
on rocks about three miles east of Exmouth, often in com- 
pany with Kellia rubra. When the animals were placed in 
basins of water they always made their way out of them, and 
fixed themselves to a dry spot, as is the case with many of 
the Littorine, which almost constantly live in free air. This 
curious and anomalous creature is entirely dissimilar to Velu- 
fina, and its natural position is far removed from that genus 
