16 CONCIIOLOGY. 



4. Galeolaria. Two species. 



Distinguished from the Vermilia by a very peculiar oper- 

 culum. Found in groups, adhering together at the base. 



Tube open at the summit ; aperture orbicular, terminated 

 on the side by a spatulous tongue ; operculum orbicular, squa- 

 mose, consisting of from five to nine testaceous parts or 

 valves, all attached to one side of the operculum ; the mid- 

 dle one dentated at the truncated part of its summit, the 

 others a little toothed on their internal edge. 



Galeolaria caespitosa. Galeolaria elongata. 



G. elongata. The elongated Galeolaria. 

 Whitish, existing in congregated masses ; operculum as 

 above. 



5. Magilus. One species. 



A very singular shell, greatly resembling a petrified body, 

 composed of a testaceous white substance like alabaster. 

 The base is bent into a short spire, with about four contigu- 

 ous whorls ; the last prolonged and nearly straight. The 

 animal, as it increases in size, abandons the spiral part by 

 increasing the tubular part, filling up the part it quits with 

 calcareous matter, which proves that it advances gradually. 



Tube partially involuted, convex in its upper exterior part, 

 the lower side flattened, platted, carinated, and somewhat 

 angular; the spire short, helix-formed, and prolonged through 

 the rest of its extent in nearly a right line ; aperture entire, 

 oval, with a sort of sinus or gutter in the middle line, produ- 

 cing the keel of the shelL 



M. antiquus. The antiquated Magilus. 

 Answers to the above description ; colour pale yellowish 

 brown, transversely wrinkled. 



