PINNOTHERES LATREILLII. © 
Fic. 6, 7, and 8. 
P. (Fem.) Testa ovato-orbiculata, antice subangustiore, convexa, glaberrima, subsolida, fronte 
producto integro vix subarcuato ; lateribus postice utrinque lineis duabus obliquis gradatim 
postice concurrentibus impressis ; manibus subovatis subtus femoribusque supra linea ciliata ; 
digitis arcuatis ; abdomine subangusto segmentis lateraliter subarcuatis, ultimo precedente 
angustiore, apice subacuminato, rotundato, integro. 
Cancer mytillorum albus. Herbst. 1. 101. 7. 2. fig. 24? 
Pinnotheres mytillorum. air. Gen. Crust. et Ins. 1.35, Leach. 
Leach Edin. Enc. art. Crust. p. 430. 
Habitat in Modiolis rarissime. 
Fig. 6, mag. nat. 7%, ead. auct. 8, femina: abdomen auctum. 
A single specimen of this elegant little crab was taken by myself in the Frith of Forth. 
Although a female, it has very much the general appearance of the male of the following species, 
from which it differs in not having the under part of the thighs hairy, and in only having one 
line of ciliz under the hands; but the most remarkable point of distinction is in the two im- 
pressed lines on each side of the hinder part of the shell. 
The abdomen in the more adult state is probably as broad as in the preceding species. 
Montagu supposes it to be the young of P. Pisum. Male unknown. 
PINNOTHERES VARIANS. 
Fic. 9, 10, and 11. 
P. (Mas) Testa ovato-orbiculata, antice subangustiore, convexa, glaberrima, solida; fronte 
producto, arcuato, integro; manibus ovatis subtus lineis duabus ciliatis; digitis valde 
arcuatis; femoribus supra ac infra linea ciliata; abdomine lateribus late emarginatis, 
articulo ultimo precedente abrupte angustiore, apice angusto, rotundato, integro. 
Cancer varians. Oliv. Encycl. méth. hist. nat. tom. 6. p. 155. 
Cancer minutus. Penn. Brit. Zooi.? 
Cancer mytillorum fuscus. Herbst Tab. 2. fig. 25. 
Habitat in Modiolis et Mytillis sat frequens. 
Fig. 9, mas magn. nat. 10, idem amplificatus. 11, maris abdomen auctum. 
This speeies, which I formerly considered as the male of P. Pisum, is found with that 
species in Modioli and Mytilli. 
Latreille considers this as the same species with P. Latrcillii, and Pennant seems to have 
given it, or some species akin to it, as the Linnean Cancer minutus, which is a species of the 
genus Grapsus. 
The contour and consistance of the shell in this and in the preceding species is nearly the 
same, but they are readily distinguished by the characters pointed out above. ‘The female (unless 
she be P. Piswm) is unknown. 
