THE MOLLUSCA 



215 



skeins, very like those of A ply si a, only of a pure 

 white colour. 



Under the microscope they show the same arrangement 

 as those of Doris, three or four young ones in each of the 

 embedded capsules. 



Elysia viridis is a pretty little bright green nudibranch, 



Fig. 92. Egg Capsules, with enclosed veligers (larval 

 stage) of Doris. About 25 diameters 



about three-quarters of an inch in length. It is sometimes 

 found in numbers on the dark green spongelike sea-weed, 

 Codium tomentosum. 



The Cephalopoda (" Head-footed "). This term is usually 

 employed as embodying but the cuttle-fishes (squid, 

 octopus, etc.), but in precise application it should include 



