28 CONCHOLOGY. 
Jash-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 Amphitrite. Pl. V. 
Animal. Body tubicular, elongated, cylindrical, attenuated 
behind with many annulated segments. 
Shell. An elongated cylindrical tube growing anaer 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 Spirordis. Pl. 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 fuci: opening of the tube terminal, rounded or angular. 
Found on Alge on the British coast. Six species. 
Spirorbis nautiloidis. Spirorbis bicarinata. 
S. spirilla. S. carinata. 
S. tricostalis. S. lamellosa. 
2. Genus Serpula. Pl. 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 
