126 



VARIOUS FORMS OF SPAWN 



her eggs by keeping them l^etween her foot and the stone she 

 adheres to. They are laid in from 6 to 10 capsules, connected 

 hy a pedicle and arranged like the petals of a rose, with 10 to I '2 



Fig. 40. — Egg-capsnles of, A, Nassa 



reticulata L. x | ; B, Buccinum 



undalum L. x | ; C, Neptunea 

 antiqua L. x J. 



Fig. 41. — Spawu of a species of 

 Natica (from a speeiiueu in tlic 

 British Museiiui) x h. 



eggs in each capsule. Those Littorina which are not ovovivi- 

 parous deposit their spawu on sea-weeds, rocks, and stones. 

 The eggs are enveloped in a glairy mass which is just firm 

 enough to retain its shape in the water : each egg has its own 



Fig. 42. — lanihiaa fragilis Lam. FL, float ; 0, ova; Pr, proboscis ; Br, luanchiae ; 

 F, foot. (Quoy and Gaimard.) 



globule of jelly and is separated from tlie others l)y a very thin 

 transparent membrane.^ 



Chiton nnarginatus, when kept in captivity, has Ijeen noticed- 

 1 Jeffreys, Brit. Conch, iii. ]>. 355. - "W. Clark, Jfarj. Xat. Hist. xvi. p. 440. 



