Kingsley.] 156 [March 5, 
teeth, from P. lunatus by the ridge on the endostome. It is nearly re- 
lated to P. spinohirsutus of the Pacific coast, but differs in the den- 
ticulated instead of spiny front, and the absence of granulations on 
the pterygostomian region, ete. 
Pilumnus melanacanthus sp. n. | 
Carapax depressed, regions but faintly indicated, minutely granu- 
lated, with several small spines on the hepatic regions. Front broad, 
horizontal, almost bimarginate ; on the upper margin a transverse row 
of spines directed forward, below which is a second margin of four 
dentated lobes, the median two being narrow, long, and truncate, 
the lateral ones broad and arcuate in outline, the teeth becoming 
larger near the orbits. Orbits above and below with minute acute 
spines. Antero-lateral margin with three strong, acute spines (be- 
sides the angle of the orbit) hooked forward, between which are a 
number of smaller ones. No spines on the pterygostomian region. 
Anterior margin of palatal region spined. Chelipeds stout, and 
armed above with stout black spines. Ambulatory feet without 
spines, stout, compressed and hairy above. 
Key West, Florida. A. 8. Packard, Jr. 
Length of carapax, 7 mm.; breadth, 9 mm.; ratio, 1: 1.28. 
Is most nearly allied to P. depressus of the west coast, from which 
it differs in the spines of the antero-lateral margin, the absence of a 
subhepatic tooth and the spiniform ornamentation of the chelipeds. 
From P. aculeatus it is distinguished by the greater number of 
hepatic spines, and the absence of the pterygostomian spine; from P. 
spinohirsutus by the depressed and narrower carapax, and having the 
hands armed above only; from P. gemmatus, Xantusw, reticulatus, lu- 
natus, ceratopus, marginatus and floridanus in having the orbits 
toothed above and below and with no hiatus, except the one at 
the inner angle; from P. Agassizi in the depressed carapax, absence 
of areolation, ete. 
Family PORTUNIDAE. Sub-Family LUPIN. 
Genus CALLINECTES Stimpson. 
Callinectes dubia sp. n. 
Surface finely granulate, median lobes of front small and not pro- 
jecting as far as the lateral ones. Orbits with two obsolete fissures 
above. Antero-lateral margin with nine teeth, including the lateral 
tooth of the carapax; anterior tooth truncate, posterior acute, lateral 
