6 [JANUARY, 
have inhabited this continent, and as in the existing creation Dicotyles is the true » 
equivalent of Sus in America, the probability of our very distinct fossil species 
belonging to Dicotyles is much increased; this probability is rendered almost 
certain, when we consider that remains of true Dicotyles have been found in 
Ilinois in company with other singular forms, (Platygonus and Anomodon) which 
by their great peculiarities would seem to indicate a period anterior to that. of 
the Mastodon. 
The measurements of the canine are: length of enamelled surface along anterior 
curvature 2:2; breadth of posterior surface ‘37: radius of curvature of posterior 
edge 2-0; of anterior edge 2°1. 
The Committee to which was referred Mr. Dana’s papers on the Crus- 
tacea of the Exploring Expedition, reported in favor of publication in the 
Proceedings. 
Conspectus Crustaceorum, §c. Conspectus of the Crustacea of the Exploring 
Expedition under Capt. Wilkes, U.S. N. By James D. Dana. 
PAGURIDEA, continued, and Subtribe MEGALOPIDEA. 
I, PacuripEa, continued. 
Among the species of the genus Pagurus, as restricted in my former paper on 
the Paguridea, there are still three groups of distinct character; one, having no 
trace of a beak, the front being truncate, and also having the fingers opening in a 
vertical plane, the hands being usually compressed, with commonly the left the 
larger; a second, having a short beak or triangular point in front, and the fingers 
opening like the preceding, with the hands subequal ; a third, having a beak like 
the last, but the fingers opening in a horizontal plane, the hands being subequal 
and more or less depressed, and never compressed. The first group has Pagurus 
punctulatus for its type; the second, P. aniculus ; the third, P. clibanarius. 
They form three genera with the following characters :— 
1. Pacurus.—Frons non rostratus, truncatus. Manus antice sepius com- 
presse, interdum subeque, seplus sinistra majore, digitis apice corneis, in plano 
verticali claudentibus. 
2. AnicuLus, D.—Frons triangulaté rostratus. Manus antice subeque, 
digitis apice corneis, in plano verticali claudentibus. 
3. Crisanarius, D.—Frons triangulaté rostratus. Manus antice subeque, 
plus minusve depresse, digitis apice corneis, in plano horizontali claudentibus. 
Species P. equalis, zebra, humilis, globost-manus, Clibanario pertinent. 
The species Pagurus aniculus may hereafter be named Anziculus typicus ; the 
P. clibanarius, Clibanarius vulgaris; and the P. Bernhardus, Bernhardus streb- 
lonyz. The name Bernhardus pubescens, (see preceding volume, p. 270,) we 
propose to change to B. scabriculus, as Kréyer* has described a Pagurus pu- 
bescensy which is probably a Bernhardus. 
Descriptiones Pagurideorum adhuc inedita. 
BERNHARDUS OBESI-CARPUS.—Frons medio prominulus, obtusus. Regio cara- 
pacis antica paulo transversa, nudiuscula. Oculi crassi et perbreves, aciculo 
longiores, squama basali ovata, subacuta, integra. Antenne externe nude, 
basi multo longiore quam oculus, aciculo crasso, brevi, apicem articuli 3til 
attingente. Pedes toti fere nudi et granulosi, non armati; antici inequi; manu 
majore oblonga, convexa, symmetrica, granulis nitidis partim seriatis, carpo 
multo crassiore, parce latiore. Pares 2di et 3tii crassiusculi, articulo 3tio supra 
*'Tidsk. 1, 251, 252. | 
