240 
It is doubtful whether there are more than one specimen of this genus. 
This shell has not, to my knowledge, been found fossil. 
CLIX. Coronula. A regular subrotund, or subconical shell, divided 
into twelve areae, with an opening both in the superior and inferior 
part ; that in the superior part closed by a four-valved operculum. 
Of this genus there appears to be three species known, which may be 
distinguished by the same specific names which distinguished them under 
the genus Balanus : C. diadema, C. testudinarius , and C. haloenaris. 
The shells of these two genera, with their inhabitants, are found deeply 
imbedded in the fat of the whale, so as to leave only the superior surface 
uncovered. M. Dufresne, who first gave this information to Lamarck, 
obtained it upon viewing two specimens, preserved in the collection of 
Mr. John Hunter, in which several of the genus Tubicinella, and of the 
species Coronula baleanaris, were thus fixed in part of a whale. M. Du- 
fresne was led by the knowledge thus obtained, to repair to Greenland 
Dock, to inquire of persons concerned in the whale-fishery, what they 
had observed respecting these animals. He was there assured, by a 
person of the name of Palmer, that he had caught a whale which carried 
more than two hundred of these animals, arranged in groups of twelve 
or fifteen families or tribes, on the superior part of the whale. Ann. 
du Mus. i. 1/0. 
Whilst placing before you a representation of a rare and unex- 
pected fossil, Coronulites diadema, Plate XVI. Fig. 19, I much regret 
at not being able to inform you where it was found. A view of the 
figure will show you its agreement with Gmelin’s description of Lepas 
diadema, Linn, which, in the words of Linnaeus himself, is, Testa sub- 
rotunda, sex lobata sulcata. Gmelin says of it : Habitat — , sordide 
alba, \ pollicis circiter alta, sursum angustior, apertura superiori infun- 
dibiliformi, dimidiam reliquae testae diametrum aequante, areis exterius 
12 triangulis, quarum 6 excavatce striis subtilibus transversis exaratce, 
sex alterce elevatce 4-5-6 prominentiis arete sibi accumbentibus } et striis 
transversis crenatis exaratis constant. Syst. Naturae, p. 3208. — I know 
