PINNOTHERES LATREILLII. 
Fig. 6, 7, and 8. 
P. {Fern.) Testa ovato-orbiculata, antice subangustiore, convexa, glaberrima, subsolida, fronts 
producto integro vix subarcuato; lateribus postice utrinque lineis duabus obliquis gradatira 
postice concurrentibus impressis ; man i bus subovatis subtus fcmoribusque supra linea ciliata ; 
digitis arcuatis ; abdomine subangusto segment is Iateraliter subarcuatis, ultimo prsecedente 
angustiore, apice subacuminato, rotundato, integro. 
Cancer mytillorum albus. Herbst. 1. 101. T. 2. jig. 24? 
Pinnotheres mytillorum. Latr. 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, feminas 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 cilife under the hands; but the most remarkable point of distinction is in the tv/ o 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 specie*. 
Montagu supposes it to be the young of P Pisum. Male unknown. 
. PINNOTHERES VARIANS. 
Fig. 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 prtecedente abrupte angustiore, apice angusto, rotundato, integro. 
Cancer varians. Oliv. Encijcl. meth.Mst. nat. tom. 6. p. 155. 
Cancer minutus. Penn. Brit. Zool. ? 
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 species, 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. Latreillii, and Pennant seems to have 
given it, or some species akin to it, as the Linnasan 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. Pisum) is unknown. 
