0) LIVERPOOL BIOLOGICAL SOCIETY. 
a decided hinge which leads me to conclude that the 
specimen is a male; the fifth segment rather longer than 
the third and terminated by several sete; the sixth is 
rather shorter than the fifth and much narrower, bearing 
at the apex one long and one short spine and one or 
possibly more sete. Cephalothorax composed of five 
segments covered all over with very fine black dots. No 
appearance of any eye; mouth subcentral, ventral, near 
the middle of first body segment; mouth organs entirely 
absent. Setz of swimming feet apparently non-plumose, 
the edges being wavered or uneven (fig. 2). Fifth pair of 
appendages in the form of two long sete springing from 
short protuberances. Abdomen composed of four seg- 
ments, the first bearing a genital appendage terminating 
in two short lateral spines. Furcal members each 
terminated by four apparently non-plumose set, the 
edges of which are marked with regular dots which may 
possibly be the scars of lost hairs (fig. 4). 
A single specimen of this striking species was taken by 
tow-net off Puffin Island in November 1888. 'The length 
of the antenne and the finely dotted surface readily dis- 
tinguished it from any other species. 
The systematic position of the genus Monstrilla is not at 
all an easy matter to decide upon, but I fail to see that 
Bourne has given any good grounds for placing it among 
the Coryczidz, where it was originally placed by Claus. 
A comparison of the two families, Coryceeidee and Cym- 
basomatide, will show that they have indeed very few 
points In common. 
