163 



Mr. Walker, who found on our shores, in a recent state, three, and 

 perhaps four, of the species which have been just shown to exist, as 

 fossils, in the neighbourhood of Paris. 



Miliolites Saxorum, Lam. appears to agree with the hollow oval worm- 

 shell, Serpula subovalis intorta, of Mr. Walker, Testae, minut. rarior. PL I. 

 Fig. 1. Mr. Montague, who separated from the genus Serpula those 

 shells of this family which are independent, or not attached to other 

 bodies, and placed them under a new genus, which he names Vermi- 

 culum, considers this shell as V. intortum ; and very justly observes, 

 agreeable to the observations which I have myself made on the fossil 

 shells in the sand from the neighbourhood of Paris, that it is so variable 

 in its formation, that, without great attention, it might be formed into 

 several species. Testae. Brit. p. 521. 



Miliolites opposita, Lam. Plate XL Fig. 20, is undoubtedly the same 

 shell as the bellied semilunar worm-shell, Serpula bicornis ventricosa of 

 Walker, Testae, min. rar. Plate i. Fig. 2. The difference which exists 

 between the representations of Lamarck and Walker, is very satisfac- 

 torily explained by the observations of Mr. Montague, who, previously 

 to the same shell having been figured as a fossil, suggested such altera- 

 tions in the figure given by Mr. Walker, as would make it agree per- 

 fectly with that of Lamarck, and names it Vermiculum bicoj-ne, Testae. 

 Brit. p. 519. Serpula bicornis umbilico perforate, Testae, min. rar, Plate I. 

 Fig. 3, appears, in Mr. Montague's opinion, to be no other than a mu- 

 tilated specimen of the former shell. The recent shell was found at 

 Sandwich and Reculver. 



Miliolites cor anguinum, Lam. Plate XI. Fig. 14, 15, and 16, exactly 

 corresponds with Serpula subrotunda dorso elevato, of Walker, Test. min. 

 rar. Plate i. Fig. 4, Vermiculum subrotundum, of Montague. 



M. trigonula, the different sides of which are shown Plate XI. Fig. 17, 

 18, and 19, is an inflated body, of an ovato-trigonal form: its recent 

 analogue does not appear to be known. 



XC. Renutina. A flat, sulcated, reniform, many-chambered shell: 



