i 4 THE FISHERIES OF THE ADRIATIC, 



Saxicava artica and the Lima, a kind of scallop, which constructs for itself a 

 comfortable nest in and by means of the coral-like weeds. Such are the 

 characteristic forms. 



Where broken rocks rest upon sand or shingle, gravel or mud, grows the 

 sponge Ancorina verruca. Under similar conditions is found an enormous 

 limivorous Annellide of extreme beauty, Sabella Spallanzanii, which attains a 

 length of as much as \b\ inches, and appears in groups, resembling sub- 

 marine palms or tree-ferns. 



Where the position is sheltered, and the shingle, being undisturbed, is 

 covered with a fine coating of sea- weed, are found the shell-framing Annellide, 

 Spirorbis pusilla, and the Crustaceans Sphceroma serratum, Amphitoe Pre- 

 vostii, and Gammarus Olivii. This is the only locality in which appears the 

 large black periwinkle (Littorina litorea). 



Where there is dense vegetation, with or without sponges, the genera 

 Caprella and Idothea, Acantonyx lunulatus, are characteristic ; also the 

 beautiful little univalves Rissoa, wonderfully varied in colour and form. 

 Myriads of Cerithea are to be found amongst the grass- wrack, besides 

 Buccinum, the bivalve Modiola costulata, species of Trochus, and a number of 

 Annellides, foremost amongst which Nerine vulgaris. 



Cystoseira or Sargassum-tangles harbours the characteristic facies of Pisa 

 Gibsii and Mitra Savignyi, and on the branches of the tangles creeps the 

 Annellide Euphrosyne myrtosa, amongst many other similar species. 



On shingle and loose rocks, exposed to the heaviest roll of the waves, 

 appear Sipunculus nudus (the Syrinx of Forbes), the bivalve Mya arctica, 

 and Hcterocirrus saxicola, a soft and very delicate Annellide discovered and 

 described by Dr. Grube, 1 to whom it owes its name : it is found in narrow 

 channels of the hard limestone, probably worked by its own industry. 



On coarse sand appear Venus decussala, V. aurea, Buccinum reticulatum, 

 Cardinm edule ; on fine sand, C. tuberculatum. 



Where the sand, or mud, is covered with dense Zostera, animal life is still 

 more numerous, and is characterised by several species of Buccinum, the 



1 " Ein Ausflug nach Trieste," &c, pp. 47, 66. 



