he 
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CONCHOLOGY. 121 
S. lineata.* S. multistriata.* 
S. subulata.* S. turbinata.* 
2. Genus Vermetus. Pl. XI. 
Animal, -As preceding genus. 
' Shell. Very similar to the Serpula, but the organization of 
the animal makes it a distinct genus; often found clustered to- 
gether, and attached to marine substances ; conical, thin, tubular, 
loosely spiral, aperture straight, circular, edges sharp and com- 
plete, several partitions not perforated towards the summit, oper- 
culum horny and complete. Inhabits the sandy shores of the W. 
Indies and Africa. 'T'wo species. 
Vermetus lumbricalis. Vermetus maximus. 
3. Genus Delphinula. Pl. XI. 
Animal. See Scalaria. 
Shell. Thick, and pearly in the interior, stibdiscoid or conical ; 
spiral whorls rough or‘angular, often detached, spiny ; large umbi- 
~ licus, sometimes triangular; the margins united, mostly fringed 
or ventricose. Inhabits the Indian and American seas. Five 
living species. Seven fossil. 
Delphinula laciniata. Delphinula distorta. 
D. turbinopsis. D. rugosa. 
D. laxa.* 
FAMILY XVI. 
Tursinacea. Eight genera. 
1. Genus Solarium. Pl. XI. 
Animal. Unknown. 
Shell. Orbicular, depressed, umbilicus large and conical, crenu- 
lated or dentated on the inner margin of the whorls; aperture 
not modified by the last whorl of the spire, which is entirely flat ; 
no columella. Inhabits the Indian seas. Seven living species. 
Eight fossil. 
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