1879.] 1538 [Kingsley. 
This species differs from P. serratus, Harti, americanus, politus and 
transversus in the acute antero-lateral teeth; from P. Herbstii, planis- 
simus, abbreviatus and depressus in the produced, arcuate, bilobed 
front ; from P. texanus in the presence of a tooth on the external sur- 
face of the hand, and in having the terminal joint of the male abdo- 
men triangular and no broader than preceding joint; from P. 
occidentalis, Sayi and texanus in the basal tooth of the dactylus; and 
from P. Wurdemanni and Harrisii in having the edge of the front 
simple, while in those species it is bi-marginate. 
Panopeus sp. 
? Xanthodes leucomanus Lockington, l. c. vit, 100 (1876). 
The specimen sent by Mr. Lockington as the type of his X. 
leucomanus is a species of Panopeus very near P. crenatus Edw. and 
Lucas, but is too young for specific determination. 
Genus XANTHO Leach. 
Xantho novem-dentatus Lockington. 
Xantho novem-dentatus Lockington, J. c. vi1, 32 and 99 (1876). 
Carapax moderately convex in front, the anterior portion rough- 
ened, behind smooth; the areolations in front are well marked and 
protuberant. Front produced as in the allied species (X. 16-dentatus 
and vitiata) two lobed, lobes arcuate with crenulated margins and 
separated from each other by aslight fissure, and from the prominent 
inner angle of the orbit by a deep rounded notch. Orbits two fis- 
sured above. Antero-lateral margin with seven small, sharp, distant 
teeth ; one or two small teeth on the postero-lateral margin behind 
the lateral angle. Chelipeds unequal, carpus and hand roughened 
above, the spine on the inner surface of the carpus small, acute; 
hands with a sulcated crest above. Posterior feet compressed, 
ciliated, not armed with spines. 
Lower California. W. N. Lockington. 
Length of carapax, 11.7 mm.; breadth, 15.2 mm.; ratio, 1: 1.30. 
Is very closely allied to X. 16-dentatus Edw. and Lucas, X. vittata 
Stimpson, and falls in Lucas’ genus Paraxanthus. It is separated from 
X. 16—dentatus by the more distinct areolation of the carapax, and 
the arcuate front; from Stimpson’s description of X. viltata by not 
having the gastric region divided into three lobules, and by the cren- 
ulated non-ciliated front. 
SS — 
= ens 
