OF THE UNITED STATES. 73 



ANIMALIA ARTICULATA. 



ANNELIDES. 

 Serpula. 



1. S. barbata, (S. G. M.) PI. xv, fig. 12. 



Specific character. With three or four distinct, longitudinal, 

 tortuous, dentated lamella), projecting from the surface. 



A very remarkable species from Alabama. Mr. T. A. 

 Conrad. 



2. Dr. M'Euen found another species, smooth and 

 much smaller, near Deal, in New Jersey. 



3. Mr. Say (Amer. Journ. Science, vol. ii,) mentions 

 another species with sixteen equal costae, from New Jer- 

 sey. I have not seen it. 



Hamulus, (S. G. M.) 



Generic character. Tubular, regular, involuted; volutions 

 distinct; aperture circular. 



A genus allied to Dentalium and Serpula, but differing 

 in its constant involuted form. 



H. onyx, (S. G. M.) PL ii, ^g. 8, and pi. xvi, ^g. 5. 



Specific character. With six elevated, angular, longitudinal 

 ribs extending from base to apex. 



Length, about an inch. 



The imperfect specimen figured on plate ii, was ob- 

 tained by Dr. Blanding at Lynch's creek, South Carolina, 

 in the green sand, and on a former occasion was supposed 

 to be a Dentalium. PL xvi, fig. 5, however, represents 



the perfect shell from the older cretaceous deposits at 



K 



