66 
GENUS HYAS: distinguished from Pisa by the absence of 
the strong spine which in that forms the anterior portion of 
the circle of the orbit ; and by the second member or arti- 
culation of the outer antennae being flattened and widened 
on the outer side. 
SPIDER HYAS : JET, Aranea. M. Edwards’ Crust., vol. 1, 
p. 812. Leach’s Malac. pi. 21. Pennant, pi. 9, fig. 16. 
STRAITENED HYAS. H. Coarctata. M. Edwards’ 
Crust., vol. 1, p. 312. Leach’s Malac. p. 21. 
I am not acquainted with these species, and therefore sup- 
pose them not to be common ; but there are specimens of both 
in the museum of the Athenaeum at Plymouth, and conse- 
quently taken at or near the Cornish coast. 
GENUS MAIA : the stalk of the external antennas inserted 
into the internal angle of the orbit, and uncovered ; nippers 
of the hand slender and pointed. 
CORWICH CRAB on SKERRY. M. Verrucosa. M. 
Edwards’ Crust., vol. 1, p. 327. M. Sqainado. Leach’s 
Malac., pi. 18. Our species differs much from the Cancer 
Horridus of Pennant, pi. 8, fig. 14, to which M. Edwards’ 
refers for his M. Squinado ; and seems not exactly similar 
to the latter author’s M. Verrucosa, pi. 3, fig. 1. It may 
possibly prove a distinct species. This in its season is the 
most abundant species of the family, and by far the largest, 
sometimes weighing so much as five pounds, and the cara- 
pace measuring 9 or 10 inches in length; so that it is com- 
monly used as food, though only by poor people and fisher 
boys, who find in it a delicate meal. Its not tempting form 
anil the small size of the legs, conspire to exclude it from 
the tables of the rich. 
PARTHEN O P IANS. 
GENUS EURYNOME: eyes retractile; joint of the hand 
mere or less triangular and armed. Lower articulation of 
the outer antennae fixed in front, and giving insertion to the 
next articulation on the forepart of the level of the inner 
canthus of the eye. 
ROUGH EURYNOME. E. Aspcra. M. Edwards’ Crust., 
vol. 1, p. 351. Leach’s Malac., pi. 17. Pennant, pi. 9, fig. 
20. Rare. There is a specimen in the Museum of the 
Athenaeum at Plymouth. 
The length of the legs in this family of Crabs, necessarily 
leads to slowness of motion; but they are well fitted to a 
residence among rocks and stones covered with sea weeds, 
among which they stride with little difficulty. In the winter 
they become almost, if not altogether torpid, concealing 
themselves at this season either in deep crevices of rocks, or 
