78 



31elampes (Conovulus) hidentatus [?]. In great plenty on sea- 

 weeds and marsh grass along the ditches. 



Orepidida, fornicata. In great numbers on old shells, gener- 

 ally those occupied by Eupagurus ; the smaller are often stick- 

 ing to the larger. The expanded animal has two snail-like 

 horns with eye-specks at their bases, and, between them, a pair of 

 lobes (tentacles ?) The front part of the body and head have the 

 form of a rather thin plate of tissue, which is very movable ; while 

 the sucking-disk rests on the " step " in the shell, and is very thick 

 and muscular ; the front edge of the disk is prolonged, in the shape 

 of a movable flap. Round the edge of the shell runs the mantle, 

 which may be considerably contracted. The gills lie, in a sheet, 

 on the inside of the roof of the shell. The crepidulge were laying 

 eggs, which adhered in clusters to the surface on which the animals 

 lay. These clusters contained a bunch of transparent sacs, each of 

 which was full of embryos. These embryos, before leaving the 

 sac, have an active motion. They take on the form of little bags 

 tied, as it were, near the top ; the bag itself is filled with yolk- 

 cells, while the loose flaps above the constriction, are bordered by 

 rows of vibratile cilia, which create brisk currents and serve to 

 move the embryo. When the crepidida is at rest the front edge 

 of the shell is a little raised and the tentacles thrust a little forth. 

 They move slowly from time to time. 



Pecten concentricus. — Scallop. In shallow water on a sand bot- 

 tom. Lies usually with its valves but little open ; but, from time 

 to time, it slowly opens its valves quite wide, as if gaping, and 

 then shuts them with a sudden clap, squirting the water in all 

 directions. The eye-specks, in a good light, shine with a green 

 metallic lustre. The gills, which are very delicate, may be con- 

 tracted, by transverse muscles, like a ruff, or they may lie flat 

 and extended. The mantle, at the edge, is turned up, so as to 

 hang down from each valve, like a little veil. On the edge of the 

 mantle are numerous fringes, while next the margin of the shell 

 are eye-specks and a double row of very short, bead-like fringes. 

 The liver is very dark green. A single very stout adductor. No 

 eggs noticed. The color of the shells varies from bright orange 

 through brown orange to brown, white with brown markings, and 

 lemon colored. 



Buccinum ohsoletum. In myriads on the flats, &c. Very plenty 

 on dead fish, &c. 



