. La mer la vie ; les invertébrés de la côte de New York. Les animaux marins. HO la mer et l'île de la vie nouvelle Jerse}'. L. heros, fig. OS, varie de un à Lahrador^irginia, et A'', diiplicata. Fig. 99, du Yucatan à Massaclmsetts Bay. Ils peuvent être reconnus par leur grande taille, la lumière jaune brun ou blanc bleuâtre, émoussé et arrondi, spire et sim- ple, ouverture ronde avec un rebord tranchant. Dans le umbillicus lieros L., ou la cavité centrale du corps verticille, est largement ouvert alors que dans une"^. duplicata il est pratique- ment fermé par un bouchon. L'ensemble de la coquille est aussi plat que dans L. heros. L

• Contributeur: The Book Worm / Alamy Banque D'Images
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. Sea-shore life; the invertebrates of the New York coast. Marine animals. HO SEA-SHORE LIFE Island and New Jerse}'. L. heros, Fig. OS, ranges from A^irginia to Lahrador, and A'', diiplicata. Fig. 99, from Yucatan to Massaclmsetts Bay. They may be recognized by their large size, light yellowish-brown or bluish- white color, blunt, rounded spire, and sim- ple, round opening with a sharp-edged lip. In L. lieros the umbillicus, or cen- tral cavity of the body whorl, is widely open whereas in A'^. duplicata it is practi- cally closed by a plug. The whole shell is also flatter than in L. heros. The ani- jTj.e. pp, 'socTHERx SAND- j-, -, ^]^ jg g, , Jjij-ge that when seen expanded COLLAR SNAIL. New Jersev. i ii ⢠i i i â i i it seems hardly conceivable that it could withdraw into its shell. However, it can perform this feat very rapidlv, and then completely close the opening with its horny operculum. The broad, muscular foot of tliese snails secretes a large amount of mucous, enabling the creature to glide readily over the bottom or bury itself beneath the surface, which it always does if in danger of being stranded by the tide. The edges of the foot are sharply angular, and a large piece forward of the head is reflected back, making a thick, flesliy shield which serves as a ploughshare when the animal burrows through the sand in search of prey. The mantle is very contractible, and can be reflected upward over the shell so as to almost wholly enclose it. The surface of the shell is thus bathed in the secretion from the mantle, and kept smooth as is common with all moUusks that cover their shells in this manner. A notch-like fold in the free edge of the mantle admits water into the gill cavity. The head is provided with two sharp-pointed tentacles. These creatures are carniverous and devour other mollusks, including the young of their own sfjecies. They are especially enemies of the clams. Applying the proboscis to the surface of the clam shell, it bores through by means o

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