Class VI. SERPULA. WORM-SHELL. 361 



Lin. Syst. 1265. No. 795. Lin. Tr. viii. 244. 10. trique- 



Gm. Lin. 3740. Mont. Test. Br. 511. TRA - 



Faun. Suec. No. 2206. angular. 



S. with a triangular shell, irregularly twisted. 



Adheres to (in a creeping form) stones and 

 other substances. 





Irregularly twined. 



Lin. Syst. 1267. No. 805. Lin. Tr. viii. 243. 11. vermi- 



G»2. Z*«. 3743. Mont. Test. Br. 50Q. cularis. 



xims Coral, tab. xxxvi. jig. 



S. with a slender, incurvated, taper, and round- 

 ed shell. 



According to Mr. Ellis, inhabits all our 

 coasts. 



Lin. Tr. viii. 243. Mont. Test. Br. 50S. 12. reversa. 



* S. with a subcylindric, wrinkled, spiral, irre- 

 gular shell; aperture reversed. Inhabits the 

 sea upon crabs ; a distinct species ? 



