6g2 WORMS. TESTACEA. 86. Serpula. 



Vitreum* Shell hyaline, glabrous and (lightly curved. 

 Schroet. Einl. in conch. 2. p. 531. n. 1 1. 

 Found fofiile in Piedmont : ^ of an inch long. 

 Shell Col'id, thin, tapering gradually. 



Minutum. Shell round, ftraightifh, fmooth, minute. 



Inhabits the Mediterranean* Plane, conch, t. 2. f. 2. 

 Shell To very minnte as not to be difcernable by the naked eye, 

 and refemblingafmall brittle or one of" the fpines of an Echinus, 



*Imperfo- Shell white, opake, tranfverfely ftriate, imperforate. 

 ratum. Kanmach. and Adam i Micro/c. p. 635. tab. 1 4../. 8» 



Found at Sandwich-, not very common : minute. 



86 SERPULA. Animal a Terebella: full 

 univalve, tubular, generally adhering to 

 other fubitances; often Separated inter- 

 nally by divifions at uneertain diftances. 



Nautiloides Shell flattiih, minute, confluent, verrucofe, fpiral, with 

 very thin femilunar internal divifions. 



Schroet. n. Litter at. 3. tab. 3. f. 22, 23, 



Inhabits Ncr-zvayfeas, adhering to the Madrepora prolifera, very 

 minnte, brownifh or white; of an uncertain figure, fometimes 

 rather oblong, fometimes more orbicular: divifions parallel: 

 aperture \ery narrow. 



Semilunum. Shell regular, oval, loofe, glabrous. 



Gualt . tefl. tab. X.f. S. Plane, conch, t. 2./, 1 if 

 Martini conch. I. tab. 3. f. 22. a, b- 



Inhabits the Adriatic and Red/eas. and fometimes found foflile. 



Shell hardly larger than a grain of fand, white or yellowifh ; the 



whorls preffed clofe together : aperture narrow, comprefled. 



Planorb 



1 * 



1st 



Shell orbicular, regular, flat, equal. 

 Found adhering to ihells. Fn./ucc. 2102, 

 Shell refembling a round fcale, and when broken horizontally 

 e^ibiting the appearance of a fpire in minute concentric 



rcics. 



Spirillum* Shell regular, fpiral, orbicular, pellucid, with round gra- 

 dually decreafing whorls 

 Plane* conch, tab. i.f.%. Ginan. adr.i. tab. 2. f. J. 

 Martini conch. 1 . fab. 'X. f. 20. C, D. 



* Pall: 



