376 



ACCOUNT OF 



Murex, &-c. This catalogue was compiled by 

 Mr George Humphrys of Leicester Square, Lon- 

 don. Montagu defines the characters of Ligula as 

 follow : 



Animal an Ascidia. Shell bivalve, equivalve. 

 Hinge with a broad tooth m each valve, pro- 

 jecting inwards, furnished with a pit or cavity 

 for the reception of the connecting cartilage. 

 In some species a minute erect tooth. 



Ligula. 



1. pubescens.l M. Portobello Sands plentiful; 

 declivis. J P. D. on other parts of the coast 



rather scarce. Those spe- 

 cimens generally called 

 Myapubescecs,arethe fry 

 of the shell denomina- 

 ted by Pennant declivis. 

 A specimen of the size of 

 the one described by him 

 has never occurred to me. 

 It is probably a pelagic 

 shell, of a very brittle tex- 

 ture, and not capable of 

 bearing the agitation of 

 the sea, which, in a de- 

 gree, may account for its 

 not being cast on our 

 shores. 



N. B. In my cabinet 

 there is still one of the ori- 

 ginal shells, of the Portland 

 Museum, which was a 

 Scottish production. 



