MONOGRAPH OF THE LEUCOSIADÆ. 297 
These characters, taken in both cases from males, are constant, as far as we can judge 
from the examination of several specimens in the British Museum. | 
Length of carapace 1:3 in. 
MYRA CARINATA, mihi (Tag. XXXII. fig. 3). Test& ovata, minut? granulatà, carinatà ; 
spin posticà media lateralibus ter quaterve longiore, lateralibus conicis, acutis, 
?? Cancer punctatus, Herbst. 
2? Ilia punctata, Edw. Hist. Nat. Crust. ii, p. 125. 
Hab. ad insulas Philippinas. Muss. Brit., Bell. 
Carapace ovate, minutely granulated, particularly at the posterior part, distinctly but 
slightly carinated along the centre; the hepatic ridge and lateral margin granulated, the 
former having a small tubercle; the pterygostomian tooth broadly triangular; the cen- 
tral spine on the intestinal region at least three times as long as the lateral ones, which 
are conical and acute. The anterior pair of legs in the female twice the length of the 
carapace, exclusive of the spine; the arm covered with tubercles; the hand slightly tumid 
near the base, but less so than in M. fugax, narrowed forwards; fingers closed through- 
out their length, finely toothed. Abdomen in the female with the fourth, fifth and sixth 
segments united, as in M. fugax. | 
Length of carapace 1 in. 
The most obvious distinction between the present species and the one previously known, 
consists in the carinated form of the carapace, which, although not very strongly marked, 
is quite distinct, and differs obviously from the rounded surface of JL fugax. | Another 
important distinction is in the comparative length of the three spines on the hinder part 
of the carapace, the central one being in the present species so much longer in proportion 
to the lateral ones than it is in the former. Whether this is the species figured by Herbst 
as Cancer punctatus I am not sure, but it resembles very closely his figures assigned to 
that species. As Professor Milne-Edwards refers to that authority for his Ilia punctata, 
and as those figures certainly do not represent an Tlia at all, I am inclined to doubt the 
existence of such a species of that genus, and to refer it to Myra. 
Myra ELEGANS, mihi (Tas. XXXII. fig. 4). Testa bis longiore quam latiore (spina 
posticá non inclusá), margine anteriore setoso, 
Hab. in mari orientali. Mus. Brit. 
Carapace oval, twice as long as broad, the central posterior spine nearly half the e 
of the carapace, the lateral ones extremely small; a slight longitudinal carina, which is 
granulated, and there are patches of granules on the branchial and cardiac regions ; front 
produced, slightly emarginate. From the front to the hepatic region the margin has a 
line of stiff curved setze. External pedipalps quite plain; mer margin > d 
less dilated than in other species. The legs very slender ‘ the si er e € P 
| fingers longer than the hand; the four posterior pairs of fee , partic y à eya , 
with the last two joints strongly ciliated. Abdomen of imperfect female oval, with the 
third to the fifth segments united. ” 
Length of carapace, without the spine, 0°4 in. ; 
Of this small and gracile species, one specimen, 
of the spine, 0:2 in. 
an imperfect female, exists in the 
