157 
ON THE OCCURRENCE OF PAULINELLA 
CHROMATOPHORA (LAUTERBORN) IN BRITAIN. 
JAMES MEIKLE BROWN, B.Sc., BS: .C.S:, 
Sheffield. 
PAULINELLA CHROMATOPHORA is a small, filose, testaceous 
rhizopod, which. is either remarkably local in its distribution, 
or else it has been generally overlooked. 
It is of great beauty and elegance, but of small size, reaching 
a length of about 30 ». On cursory examination it might be 
mistaken for a species of Sphenoderia to which it bears some 
superficial resemblance. 
In outline the test is ovoid and very symmetrically formed 
\ 
} , 
/ 4 ; 
/ 1D tae i Bigs 12: 
(fig. 1). 1t is constructed of siliceous plates, regularly disposed 
in five longitudinal rows, each row consisting of eleven or 
twelve plates. In general, the plates of adjacent rows alternate 
with each other and though in shape they are somewhat 
rectangular with rounded ends, they have the appearance of 
being hexagonal owing to their position relative to one another. 
A similar feature may be seen in the tests of Euglypha and 
Sphenoderia. A character not generally met with in the tests 
of rhizopods is the presence of a short straight collar, sur- 
rounding the narrowly elliptical mouth. 
The most characteristic structure of the animal is the 
chromatophore, a comparatively large horse-shoe shaped 
body of green colour. Typically, one only is present, but as is 
noted below two may occur in the same individual. 
The species was discovered and described first by Lauter- 
1915 May 1. 
