(1.9 
H.-A Descriptive Catalogue of the British Testacea. 
By William George Maton, M. D. V.P.L.S., $c. and the Reverend 
Thomas Rackett, M. A. F.L.S., 4c. 
Read January 17, 1804. 
Bzrosz we proceed to the more immediate objects of this 
paper, it may be proper to advert to the plan by which we have 
been guided in endeavouring to render it acceptable to the 
scientific naturalist. 
After the sentiments which we expressed on a former occa- 
sion *, it is almost unnecessary here. to remark, that we. have 
dose adhered to the Linnzan system and mode of description, 
all the species which it falls within our province to enumerate 
appearing to be reducible under Linnzus's genera, as constituted 
in the twelfth edition of the Systema Nature, and retained by 
Professor Gmelin. 
We are aware that some late writers of repute have divided the 
genus Lepas, forming out of it another which they have called 
Balanus ; and that they have separated from Ostrea all the pecti- 
nated species, affixing to them different characters, under the ge- 
. neric denomi: tion of Kern, æ th hor, by whose re- 
searches we e have be een largely assisted, and | 
taceologists in general ar are menty nee has in like man- 
ner divided the genus Serpula into two}. To our minds, however, : 
there are feasons why the original genera should remain unal- 
* Linn. Trans. vol. vi. p. 178. T Testacea Britannica, vol. ii. p. 517. 
VOL. VIII. D 3 U^ i red, 
