found on the South Coast of Devonshire. 89
hirsute claw; but the formation of the second pair is very singu- lar ; they are of a squarish shape, much compressed, and, at the ends, furnished with hair like a brush.
Length, independent of the arms, two inches.
Colour, when alive, more or less orange, sometimes yellow on the sides, and on the caudal fins ; the arms usually pink.
This new and curious species of crab was discovered in dig- ging for Solen Vagina, at the depth of nearly two feet beneath the surface, on a sand bank in the estuary of Kingsbridge. It is by no means plentiful; but a sufficient number has been taken, with much trouble, to learn that the large arm is not constant to one side, nor always so very disproportionate as in that from which the figure was taken.
The crustaceous covering of the body is very thin, and not far remote from membranaceous. The females, as in most of the Cancer tribe, more rarely occur : the ova of one taken were fixed under the tail, and of a red colour.
A new and singular species of Oniscus is found to inhabit the thoracic plate of this crab, and of which a figure and descrip- tion are added to this paper.
Cancer Astacus stellatus. Tab. III. Fig. 5.
Body long, composed of six smooth joints: thorax smooth behind, the anterior part roughened with minute spines dis- posed in longitudinal rows, and terminated by a very broad, serrated, trifid proboscis, the middle division of which is long- est: antennae four, pedunculated, the outer pair nearly as long- as the body ; inner pair short, bifid : eyes pedunculated, con- cealed under the proboscis : arms equal, of a moderate size ; on
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