LAMELLARIA. 469 
spirale plus aigué.”” The tentacula arise from the short mem- 
branous awning of the head; they are long, flattened, pomted, 
pale yellowish-white, with large black eyes a very small di- 
stance from the bases, on extremely short offsets at the external 
angles, which gives them the appearance of bemg nearly on 
the bases of the tentacula. The foot is rather large and long, 
very little rounded in front, but deeply labiated, forming 
short auricles; it gradually becomes acuminated behind ; it is 
above and below of a pale yellow. The branchial apparatus 
is, we believe, a single plume, crescent-shaped, which gives it 
the aspect of being double ; it consists of about twelve vascular 
filaments lying on the centre of the back part of the head, 
under the protection of the front portion of the shield, whilst 
the liver and the ovarium, and in the male the testis, occupy 
the spiral portion. The anus opens between the mantle and 
the body, rather posteriorly on the left side. The verge is a 
spatulate organ on the right side of the neck, and is con- 
nected with the testis by a very long convoluted thread or 
epididymis. 
These animals are sparingly taken in the summer, in the 
coralline zone at Exmouth; but in winter, after a gale, they 
are often washed up in great numbers on the Warren Sands, 
near the same place. 
Having recently received live examples, I am enabled to state, 
that the branchial apparatus is a single, arcuated, hght-brown 
plume of coarse strands, transversely placed, with the pomt 
reaching to the canal between the foot and the mantle. What 
Montagu calls an appendage or protruded arm from a sinus of 
the mantle is what has now been described ; he also mentions 
and figures the tentacula as very short; this is not so, unless 
his specimen was mutilated, a very common occurrence. I 
have seen hundreds of live animals of all colours, but the tenta- 
cula were what would be called moderately long, and at least 
twice the length of those in Montagu’s vignette, fig. 6. 
L. rentacutata, Montagu. 
L. tentaculata, Brit. Moll. iii. p. 358, pl.99. f.10; (animal) pl. P.P.f. 2. 
Though the authors of the ‘British Mollusca’ quote me 
