t 72 ] 
1 
VII. A Defer iption of a very remarkable 
aquatick InfeEl , found in a Ditch of 
fandmg PVater near Norwich, i?i the 
Spring of the Dear, 1762. By Edward 
King, Ef quire , of Lincoln’s-Inn, F. R . S . 
Read Feb. A B. IV. A is the female, and B 
I the male, both reprefented on their 
backs, in the pofture in which they ufually fwim ; 
a, a , are a number of fmall tranfparent, fringed, 
fins, placed parallel, and contiguous to each other. 
They are almoft always in a waving motion, and 
the animalcules feem to keep themfelves fufpended, 
at different heights, in the water, by means of 
them ; for on their ceafing to move they fink to 
the bottom : d is one of thofe fins belonging to 
the female feen in front, and h is one of thofe 
belonging to the male, in which there is a very 
remarkable difference : c is the head of the female ; 
and g is the head of the male ; diftinguifhed by three 
projeding fubftances like horns, or tufks which are 
marked k in figure B ; one of the long ones on 
the fide is drawn feparate at e t and the crooked one 
in the middle at f ; this laft probably lerves as a kind 
of trunk, and the former may be of fervice to catch 
their prey, whatever it is j i is a very fingular pro- 
jeding fubftance in the male, and may, perhaps, con- 
tain the parts of generation j and b is the ovarium of 
the 
