602 WORMS. FESTACEA. 86. Serpula. 
Vireum. Shell hyaline, glabrous and flightly curved, 
Schroet. Einl, in conch. 2. p. $31. n. Vr. 
Found foffile in Piedmont: 3 of an inch long. 
Shell folid, thin, tapering gradually, 
Minutum. Shell round, ftraightifh, fmooth, minute. 
Inhabits the Medsterranean. Planc. conch. t. 2. f. 2. : 
Shell fo very minnte as not to be difcernable by the naked eye, 
and refembling a {mall briftle or one of the {pines of an Echinus. 
* Imperfo-. Shell white, opake, tranfverfely ftriate, imperforate. 
oratum. Kanmach. and Adam's Microfc. p. 635. tab. 14. f. 8* 
Found at Sandwich; not very common: minute. 
86. SERPULA. Anzmal a Terebella: Ae 
univalve, tubular, generally adhering to 
other fubftances; often feparated inter- 
nally by divifions at uncertain diftances. 
Nautiloides Shell flattifh, minute, confluent, verrucofe, fpiral, with 
very thin femilunar internal divifions. 
Schroet.n. Litterat. 3. tab. 3. f. 22, 23, 
Inhabits Norway feas, adhering to the Madrepora prolifera, very 
minnte, brownifh or white; cf an uncertain figure, fometimes 
rather oblong, fometimes more orbicular: divifions parallel: 
aperture yery narrow. ; 
Semilunum. Shell regular, oval, loofe, glabrous. 
Gualt. tel. tab. X. f.S. Plane. conch. t. 2. f. 1? 
Martini conch. 1. tab. 3. f. 22. a,b. 
Inhabits the Adriatic and Red eas, and fometimes found foffile. 
Shell hardly larger than a grain of fand, white or yellowifh ; the 
whor!s preffed clofe together: aperture narrow, compreffed. 
Planorbis. Shell orbicular, regular, flat, equal. 
Found adhering to fhells. Fr. /ucc. 2102. 
Shell reíembling a round fcale, and when broken horizontally 
tubing the appearance of a fpire in minute concentric 
circles, 
Stirillam, Shell regular, fpiral, orbicular, pellucid, with round gras 
dually decreafing whorls _~ 
Plane. conch. tab.1.f. 8. Ginan. adr.A. tab. 2. f. 7. 
Martini conch. 1. tab, 3.f. 20, C,D 
Pall. 
