LAMELLAEIA. 469 



spirale plus aigue." The tentacula arise from the short mem- 

 branous awning of the head ; they are long, flattened, pointed, 

 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 being nearly on 

 the bases of the tentacula. The foot is rather large and loiig^ 

 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, light-brown 

 plume of coarse strands, transversely placed, with the point 

 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 loug, and at least 

 twice the length of those in Montagu's vignette, fig. 6. 



L. TENTACULATA, Montagu. 



L. tentaculata, Brit. Moll. iii. p. 358, pi. 99. f. 10; (animal) pi. P.P. f. 2. 

 Though the authors of the ' British Mollusca' quote me 



