256 Zoological Society :— 
The superior, anterinee have the basal joint of the peduncle broad 
and much hollowed to receive the eye, and its inner border carries a 
short lamellar appendage. Each has two filaments with thickened 
bases, of which one is nearly twice as long as the other, and the 
longer has a length nearly equal to that of the carapace exclusive of 
the rostrum. The basal joint of the inferior antennee is short and 
thick, and it has a small emargination in front on the upper side. 
Their palps are large, extending very nearly as far as the rostrum, 
and they are shaped like the quarter of an elongated ellipse; but 
the thick outer margin curves slightly inwards, and projects in front 
as a short tooth. The inner margin is fringed with hair. The fila- 
ment is longer than the total length of the Crustacean, including the 
rostrum. 
All the feet are slender, and the first three pairs are two-fingered, 
with ovate hands, the rest being monodactyle: none are multiarticu- 
late. The order of their length, commencing with the longest, is 
5, 4=3, 2, 1; the third and fourth pairs reach beyond the eyes ; 
the first pair has a fringe of hair at the under edges of all the joints, 
and the second and third joints each carry a spine at the distal ex- 
tremity of the underside. The first pair of pedipalps is long, slender, 
and pediform; they extend beyond the eyes. 
The abdomen is subcompressed in front, much compressed behind, 
and the anterior five segments are furnished with large and promi- 
- nent false feet, each terminated by a pair of narrow flexible plates 
fringed with hair, of which the outer one is longer ; the basal joint 
is shorter than either. All the segments have their inferior margins 
fringed with hair. The fourth, fifth, and sixth segments possess a 
median keel, which terminates posteriorly with a small sharp tooth ; 
and the sixth segment has in addition a small tooth at each posterior 
angle. The posterior margins of the fourth and fifth segments have 
a small notch at the middle of each side. The seventh or caudal 
segment is about as long as the sixth, which is longer than any of 
the preceding segments ; it is narrow, terminates in a point, and is 
armed with a small spine at each side near the posterior extremity, 
The lateral plates are narrowly oval and fringed with hair; both 
pairs extend beyond the seventh abdominal segment, but the outer 
plates are larger than the inner, which latter have a longitudinal me- 
dian groove on the upper surface between two low crests. There is 
also a groove on the upper surface of the exterior plates ; but it is 
not in the median line, and it terminates at the outer margin not far 
from the posterior extremity of the plate. At this place there is a 
small sharp tooth, and here commences a low crest which crosses 
the plate with a curve and divides it into two unequal portions. The 
common basal joint of these plates has a small sharp tooth at its 
postero-exterior angle. 
Large quantities of this Peneus are taken at the mouth of the 
Tagus during the spring and summer months; and it frequently 
appears on the breakfast-tables of the hotels in Lisbon, where indeed 
it first attracted my attention. It is known in the market under the 
name of “‘Camarao,”’ 7. e. Prawn. The living Crustacean has a pale 
