256 SESSILE CIRRIPEDES. 



by water, attached to any kind of marine substance, whether 

 moveable or stationary. The fossil species occur in almost all 

 tertiary strata. Fig. 4 to 7. 

 SERPULACEA. Lam. The fourth family of the order Sedentary 

 Annelides, Lam. containing the following genera of tubular, 

 irregular shells. 



1. Serpula, attached by a small portion of the shell. Fig. 4. 

 2 Spirorbis, attached by the whole length, coiled. Fig. 5. 



3. Galeolaria, with the open extremity raised, and the 



aperture tongue-shaped. Fig. 6. 



4. Verm i li a, attached by the whole length, straight or waved. 



Fig. 7. 



5. Spiroglyphus, which hollows a bed in the body to which 



it is attached. Fig. 8. 

 Sowerby. (Genera of Shells, published at 50, Great Russell 

 Street, Bloomsbury,) gives satisfactory reasons for re-unit- 

 ing the whole of the preceding under the name Serpula. 



6. Magilus, which burrows in coral; outer lip reflected. 



Fig. 9 to 10. 



7. Leptoconchus, outer lip reflected. Fig 11. 



8. Stylifer, spiral, thin, globular, living in Starfish, Fig. 



12, 13. 



The three last genera should certainly find some other place 



in the system. 



SESSILE CIRRIPEDES. Lam. (Sessilis, low, dwarfish.) An 



order of Cirripedes, consisting of those which are attached by the 



base of the shells, containing the genera Tubicinella, Balanus, 



Coronula, Acasta, Pyrgoma, Creusia. To which may be added 



some other genera enumerated in explanation of figures 14 to 33. 



The shells of the Sessile Cirripedes consist of two different sets 



of valves : 1st. The parietal valves, or pieces arranged in a circle, 



side by side, around the body of the animal, (an arrangement 



designated coronular by De Blainville.) 2nd. The opercular valves, 



or pieces placed so as to enclose the aperture. Between those 



opercular valves the cilise protrude which characterize the class. 



