PERACARIDA iMYSlDACEA-) AND EUCARIDA (^DECAPODA) 85 



under the carapace laterally and posteriorly, like the masses of 

 ova usually seen there, and entirely composed of embryos, yet 

 no egg-cases were visible. They swarmed in great numbers, and 

 had brownish-red pigment on their bodies, yet no egg-capsules 

 were visible. This occurred in 1863, and unfortunately the 

 specimen has been lost. Such would appear to have been foreign 

 structures. 



Porhmus depiirator, L. Bell states that the anterior margin 

 of the carapace has three flat teeth ; but he does not add that the 

 margin of these is beaded, and this is continued all round the 

 raised margin, the posterior lines of the carapace being also 

 regularly though less distinctly granulated. 



Portiinus holsafiis, O. Fabr. This species occurs in great 

 numbers at St Andrews, and, since the introduction of nets for 

 capturing the food-fishes, has become a source of considerable 

 annoyance and even loss to the fishermen, since it severs the 

 meshes of the net, probably with its sharp chelipeds. 



Macropodia rosfrata, L. All the examples procured were males, 

 which appear to preponderate in most captures. One, 7 inches 

 across the limbs, had each limb enlivened by many tufts of green 

 Ulva ; another had many tufts of Phiinularia pimiata on its body 

 and limbs, whilst two had meshworks of Cainpanularia verticillata 

 on the dorsum, antennae, and limbs, the zoophyte creeping round 

 the great cardiac tubercle and adding to the length of the antennas. 

 Another had a pale patch oi Halichondria panicea extending forward 

 to the gastric tubercle, whilst the sandy tube of a Terebella curved 

 over the right branchial region, and opened between the first pair 

 of walking limbs. 



Hyas araneiis, L. In specimens which have recently moulted, 

 hairy ridges arise just in front of the cardiac region and run forward 

 nearly to the tip of the rostral forks. These had been over- 

 looked by Bell, who also observes that there are no spines, though 

 numerous groups of short, sharp, spine-like hairs occur over the 

 entire surface of the abdomen and adjoining portion of the cephalo- 

 thorax. In one, near the base of the groove on which the gills rest, 

 were a number of small dark points in the hollows. These proved 

 to be stalked ova, probably of a leech, the cxration of which by the 

 branchial currents must have been perfect. Most of the specimens 

 are brownish purple or reddish purple, and the tips of the ambula- 

 tory limbs are much sharper in the young. In general, the ova 

 are borne in layers attached to the hairs of the endopodites of the 



