218 



HABDWICKE'S SCIENCE-GOSSIP. 



[Oct. 1, 1SG7. 



{ , The rocks left uncovered at low water are green 

 with two species, either of which is suitable for a 

 marine aquarium. The narrow kind is Entero- 



Fig.207. Carrageen (Chonrtrus crispus). 



morpha compressa, and the broad, like green frills, 

 is Ulva latissima; in company with them is the 

 purplish Irideea edulis, the common Bhodymenia 



Fig. 208. Rhodymenia palmata. 



paltnata (fig . 208), and the delicate wavy purple 

 fronds of the laver Porphyra laciuiata, which are so 



thin that they cling to the fingers like a film when 

 any attempt is made to lift them from the water. 

 The little pools on the rocks are often fringed with 

 the interesting Corallina officinalis, 

 long believed to belong to the animal 

 kingdom, from the quantity of lime 

 which it secretes (fig. 209). Bleached 

 specimens cast upon the beach are of 

 a chalky whiteness, but when living it 

 is of a purplish tint. 



But the shore has other spoils of the 

 ocean which have been left by the tide 

 beside seaweeds, and much more 

 likely to attract attention. There are 

 the pixy-purses, or egg-cases, of the 

 Spotted 



Fig. 209. 



Dog-fish, and the common c ° r a i }"" 1 m ^f " 

 Skate, described and figured in this 

 work (for 1865, page 182) ; and there are also those 

 common but puzzling objects the tufts of egg-cases 

 of the common Whelk (fig. 210), which roll and blow 



Fig. 210. Egg-cases of Whelk. 



about upon the beach, and are certain to elicit a 

 query from juveniles. The membrane, mounted in 

 balsam, is a good microscopic object (Science- 

 Gossip, 1SG7, p. 91). Less common are the clusters. 



Fig. 211. Eggs of Cuttle-fish. 



like bunches of black grapes (6g. 211), of the eggs 

 of the cuttle-fish, ot the same kindred as the 

 Octopus, so graphically described by Mr. J. K. Lord 

 in a former number (1865, page 50), and the original 

 of the "Devil-fish" of Victor Hugo's "Toilers of 

 the Sea." Apropos of the cuttle-fish, the white 

 oblong plates commonly called " cuttle-fish bone," 



