31 



with the G. Cineras without a further examination 

 of its structure. 



Otion Cuvieri Otion Blainvillii. 



ASPERGILLUS 



SERPULA AQUARIA. LinilCBUS. 



Burrows j pi %%jig. 3. 

 In separating this shell from the Linnaean Serpulae, 

 La Marck has been guided, as in every other instance, 

 by the distinct organization of the animal ; and though 

 the inhabitant of the Aspergillum had not been seen 

 by him, the difference of its shell fully authorizes his 

 having distinguished it from the Serpulae, and assum- 

 ing that they cannot be the same. 



This elegant and very singularly formed shell is a 

 testaceous tube, (La Marck calls it a testaceous sheath), 

 somewhat curved, though in most instances nearly 

 straight, gradually tapering towards, and open at, the 

 upper extremity, becoming somewhat club-shaped to- 

 wards the lower end, which is closed by a convex disk or 

 cover, perforated by numerous small holes ; and some- 



