DR. W. C. MSINTOSH ON THE HAIRS OF CARCINUS MJENAS. 99 
DESCRIPTION OF THE PLATES*. 
PLATE XIX. 
. 1. Hairs from the inner rows of the long segment of the external foot-jaw : one shows the peculiar 
marking at some distance above the insertion; a smooth and a bristled tip are also seen. 
. 2. Hairs from the inner or dorsal surface of the great or external foot-jaw. 
. 3. Two hairs from the anterior margin of the squarish segment of the same foot-jaw. 
. 4. Hair from the circlet on the compound eye, loaded with parasitic growths. 
. 5. Recurved fangs of a hair from the whip pertaining to the great foot-jaw, and tip of another from 
the strong rounded segment of the third pair of foot-jaws. 
ig. 6. Bristles from the tip of the strong limb of the second pair of foot-jaws. 
. 7. Fragment of areolar layer, with hairs both bristled and serrated, from the long segment of the 
same part. 
ig. 8. Bristle from the tip of the strong limb of the second pair of foot-jaws, acted on by nitric acid. 
ig. 9. Tip of the delicately jointed organ of the same foot-jaw in an abnormal specimen. 
ig. 10. Extremity of the delicately jointed limb of the third pair of foot-jaws. 
ig. 11. Extremity of the external division of the fifth pair of foot-jaws in the soft Crab. 
ig. 12. Bristle from the broad extremity of the middle segment of the same foot-jaw in the soft animal. 
. 13. Brushed hair from a chela. 
. 14. Hairs of the larger terminal antennula of the internal antenna. 
. 15. Widely-spiked hair from the ventral surface of the carapace. 
. 16. Portion of the great clasper near the point, showing the short curved fangs which incline towards 
the base of the organ ; from a soft Crab. 
. 17. Pointed horny process at the anterior end of the hairy ridge on the floor of the stomach. 
PLATE XX. 
. 1. Some of the larger hairs from the right side of the anterior portion of the stomach. 
. 2. Portion of one of the hairy ridges overlapping the central depression on the floor of the 
stomach. 
. 3. Delicate filmy hairs from the upper portion of the same region on each side of the central horny 
bar posteriorly. 
. 4. Fragment of hair, with cluster of Algz, from the socket of the eye. : 
. 5. Fibres from-beneath the external brittle calcareous layer of the eminence at the posterior part of 
the stomach, composing the asbestos-like mass. 
. 6. Portion of membrane, with hairs, cells, and granules, from the region to the outside of -— hairy 
ridges on the under surface of the stomach. 
. 7. Piece of translucent membrane from the upper and posterior part of the stomach, with hairs 
attached. 
. 8. Square of membrane from the floor of the stomach between the hairy ridges, showing the groups 
of minute spikes. 
. 9. Two longer groups on a fragment of membrane from the anterior portion of the same region. 
.10. Fragment from the posterior part of the stomach, showing the origin of the hairs from the 
horny matrix in groups of three. - 
* The powers used in these observations were 80 and 250 diameters. 
