28 CONCHOLOGY. 



lash-like appendages at the end ; covered with adhesions of sand 

 and shells. Inhabits the coast of New Holland. Four species. 



Terebella conchilega. Terebella cristata. 



T. ventricosa. T. vermicuta. 



4. Genus Jtnphitrite. PI. V. 



Animal. Body tubicular, elongated, cylindrical, attenuated 

 behind with many annulated segments. 



Shell. An elongated cylindrical tube growing thinner towards 

 the base, of a tough membranous texture, and generally without 

 adhesions. Mediterranean sea. Seven species. 



Amphitrite ventilabra. Amphitrite vesiculosa. 



A. penicilla. A. volutacornis. 



A. magnifica. A. infundibula. 



A. minima. 



FAMILY IV. 



Serpulacea. Five Genera. 

 1. Genus Spirorbis. PI. V. 

 Animal. Gills or respiratory organs separated or covered by 

 an operculum. 



Shell. A testaceous tube turned spirally on a horizontal plane, 

 the lower portion of which is attached to marine substances, gen- 

 erally fuel : opening of the tube terminal, rounded or angular. 

 Found on Algae on the British coast. Six species. 



Spirorbis nautiloidis. Spirorbis bicarinata. 



S. spirilla. S. carinata. 



S. tricostalis. S. lamellosa. 



2. Genus Serpula. PI. V. 



Animal. Body tubular, elongated, depressed, and attenuated 

 behind ; segments numerous and narrow ; small bundles of awl- 

 shaped bristles in a single row on each side. 



Shell. A solid calcareous tube, brown, purple, yellow, tawny, 

 pink, white, or tinged with green. The shells are irregularly 



