OF SOUNDINGS. I5 



Fig. 66. Pebble of fossiliferous limestone, containing encrinal plates found in 

 the soundings marked No. 12, 10 fathoms. 



Fig. 67. Scale A, represents TTifths of an Enghsh inch equally magnified with 

 the drawings from fig. 1 to fig. 48, (excluding figs. 27, 31, 34, and 37.) 



Fig. t)8. Scale B, represents r/jjuths of an inch equally magnified with the 

 figures from fig. 49 to fig. 65 inclusive. 



It is not without much hesitation that I have ventured to attach specific names 

 to some of the forms above described, but for the purposes of this paper it was 

 thought that these provisional names would be more convenient than mere refer- 

 ences to the figures. I trust that the figures themselves, which were all drawn 

 by the aid of a camera lucida, will be found sufficiently accurate to enable natur- 

 alists interested in this subject to identify the species. 



Published by the Smithsonian Institution, January, 1851. 



