23 
Description of an Entomostracan inhabiting a Coal 
Mine. By G. Stewardson Brady, C.M.Z.S., &c. 
With Plate VI. 
The interest attaching to the little animal here described 
lies chiefly in the peculiarity of its habitat. The members of 
the order Copepoda, to which it belongs, are widely distri- 
buted, inhabiting in vast numbers both fresh and salt w'ater. 
They occur abundantly in lakes, ponds, and ditches, where 
they are chiefly represented by various species of the genera 
Cyclops, Diaptomus, and Canthocamptus ; in brackish water 
by Temora, Tachidius, &c. ; and in the sea by a large number 
of families and genera of free-swimming habits. But besides 
these there is a large group of species which are entirely 
parasitic, being found in the branchial cavities of Ascidians 
and in other analogous situations. But the species now 
under notice was found living under circumstances widely 
different from any of these. The roof of a part of the work- 
ings of Cramlington Colliery is kept constantly wet by the 
percolation of water from above, and here, amongst a slimy, 
gelatinous, vegetable growth, consisting apparently of imper- 
fectly developed algae, such as Chaetophora (?), this little 
creature lives and multiplies. In anatomical structure it 
does not depart very widely from the genus Canthocamptus, 
under which I have here placed it ; but there is great diffi- 
culty in accurately ascertaining the structure of the limbs and 
maxillary organs of animals so minute as this, and of which 
no great supply of specimens is easily attainable. The posi- 
tion here assigned it must, therefore, be looked upon as 
merely provisional. 
Order. — Copepoda. 
Family. — Harpactid.e. 
Genus. — Canthocamptus. 
Canthocamptus cryptorum, nov. sp. 
Body slender, gradually tapered, the cephalothorax not 
very much stouter than the abdomen ; first segment equal in 
length to the following five ; superior antennae eight-jointed, 
those of the female (PI. VI, fig. 2) slightly 1 tapering from base to 
apex, somewhat constricted at the fifth joint ; joints not much 
differing in length, fifth and seventh rather the shortest, 
sparingly setose, and having no distinct flagellum ; two long 
setae from the upper margin of the second joint, five or six 
fr.>m the third, one or two from the fourth, fifth, sixth, and 
