ANOMURAN COLLECTIONS MADE IN PORTO RICO. 
135 
Petrolisthes ? amoenus (Guerin). Plate 3, fig. 3. 
Porcellana amcma Gu6rin, in La Sagra’s History of Cuba, viii, Atlas, pi. ii, fig. 2, “1855.” 
The front is in the form of an obtuse angle ; it has a deep depression front the apex along the 
median line to a line which curves from the slight protuberances of the gastric region to the shoulder 
where the cervical suture begins; the sides of the front are denticulated; there is a spine on the orbit 
and one at the shoulder. The carapace is without rugse; a lens discloses a slight pubescence over the 
entire surface but becoming a little more marked near the front; it is longer than broad, measuring 
from the apex of the rostral projection; the areolations are very indistinct. The left cheliped is 
wanting, the right is smooth to the eye; the hand is granulose under a lens, the carpus is minutely 
rugose. The carpus is armed with four teeth on the inner margin very much like those of P. sexspi- 
nosus; it also has a row of four or live much smaller ones on the outer margin. The hand is marked by 
a row of spines on the lower margin of the palm, by a carina on its crest, and by a sulcus which runs 
the length of the linger. The dactyls of the ambulatory feet are spiny below and the merus has a 
line of four or five spines above. This species is readily distinguished from P. sexspinosus by the lack 
of coarse rugse on the carapace and chelipeds. 
A single specimen from the reefs at Ponce, Porto Rico. Its identification with La Sagra’s speci- 
mens from Cuba is by no means complete, but the general characters are there. Guerin’s figure 
would indicate that P. amoenus was much like P. sexspinosus in color. 
Genus PISOSOMA. 
Pisosoma glabra Kingsley. Plate 3, fig. 5. 
Pisosoma glabra Kingsley, Proe. Acad. Nat. Sci. Phila., p. 406, pi. xiv, fig. 2, 1879. 
The front is broad, slightly emarginate; the middle is a little in advance of the inner angles of 
the orbits. In general, the surface of the carapace is smooth, though slightly rugose near the posterior 
angles. The chelipeds are short and stout, subequal. When the hand is drawn back under the thin 
inner edge of the carpus, a large tooth-like projection nearly reaches the line of the inner base of the 
dactyl and the carpus. The margin is further divided up by three other toothlike lobes; a line drawn 
from the ends of the lobes at the extremes of the margin shows the middle lobes in advance; the outer 
margin is armed with aline of sharp granules; parallel to this is another line of like granules, but 
smaller in size and shorter in length of line. The hand is more triangular than in P. angusiifrons 
or P. serralu. 
There was but one specimen in the Porto Rico collection. This agrees well with the type from 
which the figure was made. The exact locality is not given on the label. 
Pisosoma angustifrons, new species. Plate 3, fig. 6. 
Tins species is much like P. greeleyi Rathbun. 1 It differs in having a rougher carapace; the sides 
are less arcuate. The right cheliped is stout and larger than the left. The carpus has numerous large 
and well separated granules evenly distributed on its upper surface; the granules on the carpus of 
P. greeleyi are crowded on the outer margin. The inner margins of the carpus in P. angusiifrons is armed 
with four blunt teeth, one of which has a double point, otherwise the teeth are even in size and similar 
in shape. P. greeleyi has but three granulated teeth, uneven in size. The hand of the latter is granu- 
lated; the granules are not arranged in rows; in P. angustifrons there are two prominent rows of 
granules on the palm. 
One specimen from Trinidad in the Albatross collection. 
Pisosoma serrata, new species. Plate 3, fig. 7. 
The front is a little advanced in the middle, otherwise it is rectangular in appearance. The orbits 
are deeper than in P. angustifrons. The carapace is convex in both directions and is rugose near the 
lateral and posterior margins. The branchial and other depressions are slight. The chelipeds are 
stout and unequal. The thin inner margin of the carpus is incised; three notches divide it into teeth, 
which are again divided into two or more points; the surface near the margin is set with large, rounded 
1 Proe. Wash. Acad, Sci., n,p. 147, pi. vnr, tig. 4, 1900. 
