GINGLYMACONCHA. ANOMIADZ. Jue 
by these fisheries, of which the oyster is the most considerable: 
this is conducted by a company of free dredgers, established by 
prescription, but subject to the authority and government of 
the mayor and citizens of Rochester. In 1729 an Act of 
Parliament was obtained for the better management of this 
fishery, and for confirming the jurisdiction of the said mayor 
and citizens, and the free dredgers. The mayor holds a Court 
of Admiralty every year, to make such regulations as shall be 
necessary for the well-conducting of this branch of fishery. 
Seven years’ apprenticeship entitles a person to the freedom of 
this company. All persons catching oysters, not members of 
the fishery, are liable to a penalty. The company frequently 
buy brood or spat from other parts, which they lay im this 
river, where they soon grow to maturity. Great quantities of 
these oysters are sent to London, to Holland, Westphalia and 
the adjacent countries. 
ORDER III. TRIMYA. 
Shells with three adductor muscles and two small adductor 
tendons buried in the anterior adductor muscle. The foot 
wanting. 
FAMILY ANOMIAD. 
Shells with unequal, irregular valves ; the right valve smaller, 
emarginated (notched) or perforated under the umbones. 
Genus 72. ANOMIA. 
Shells with unequal, irregular valves; the right valve smallest, 
generally flat, perforated or emarginated under the umbones ; 
the operculum somewhat bony, smail, elliptic, adhering to ma- 
rine bodies; the left valve perfect, entire, concave, a little 
larger. 
