10 | (JANUARY, 
teriorem inermis. Pedes antici mediocres, carpo inerm{i, manu paulo tumida, 
supra subgibbosa, digitis hiantibus, apice inflexis et acutis. Pedes 2di 3tii 
Atique subequi, tarsis fere rectis, longis, articulo penultimo longioribus. Had. 
in mari Atlantico juxta ‘‘ Rio Negro’’ Patagoniz, et in mari Pacifico prope 
‘‘ Valparaiso.” Long. carapacis 3—4’”. : 
CYLLENE FURCIGER.—Rostrum elongatum, spiniforme, frontis latitudine non 
brevior. Thorax infra ad extremitatem posteriorem duabus spinis longis diver- 
gentibus postice productis armatus. Pedes antici angusti, carpo articuloque 
secundo spina brevi curvata armatis, brachio inermi. ‘Tarsi 2di 3tii 4tique parce 
armati, styliformes.—Haé in mari Suluensi. 
TrispoLa LaTa.—Carapax late ovatus non pubescens, paulo lJongior quam 
latus, lateribus pone oculos parce undulatis, rostro lineari, dentibus frontis late- 
ralibus rostro remotis, apice acutis et paulo divaricatis., Pedes antici parvuli, 
tenues, manu pedibus sequentibus vix crassiore. Hab. in mari Atlantico, prope 
insulas ‘‘ Canary ;”? e stomacho piscis ‘* Bonito’’ lecta. Long. corporis fere 4”. 
TRIBOLA PUBESCENS.—Carapax oblongus, subovatus, pubescens, lateribus pone 
oculos undulaiis, rostro lineari, dentibus frontis lateralibus rostro minus remotis. 
Pedes toti dense brevissiméque pubescentes; antici rostrum paulo superantes, 
angusti, inequi, manu dextra non latiore quam carpus. Pedes 8 sequentes fere 
duplo longiores, 2dis brevioribus quam 3tii. Had. in Archipelago ‘* Paumotu ”? 
mari Pacifico. 
Conspectus Crustaceorum, §c. Conspectus of the Crustacea of the Exploring 
Expedition under Capt. C. Wilkes, U.S. N. By James D. Dana. 
MACROURA. 
We follow De Haan in placing the genus Galathea with the Anomoura; and 
near it we arrange A‘glea, which widely differs from most other related species 
in having penicillate instead of foliose branchia. 
The Macroura, excluding these groups, includes three distinct sections or sub- 
tribes. 
One, the ** Fossores ”’ of authors, or the THauasstnipEA, has close relations en 
one side with the Paguri, and on the other with the Squillide. They constitute 
a line of gradation between these extremes, independent mostly of the other 
Macroura, and osculating only with the Astaci, although removed from them in 
general habit and structure. ‘There is a diversity among the legs as to form and 
position, which is not found in any other Macroura, and calls to mind the Paguri. 
Moreover, there is in general a looseness of structure, a length of abdomen, and 
sluggish habit of body, unlike the trim compact forms of the typical Macroura. 
The anterior feet are thrown directly forward and are thus fitted for the burrow- 
ing habits of the species. 
The second subtribe—the AstacipEa—is composed of the highest grade of 
Macroura, approaching in some points of structure the Brachyura. This is seen 
in the fact that the sides of the carapax fold under and unite to the epistome, as 
is well shown in Scyllarus and less perfectly in Astacus; also in the absence or 
small size of the basal scale of the outer antenne. The Astaci are the transition 
species between the other Astacidea and the Caridea, and in the genus Parane- 
phrops, White, the antennary scale is not smaller than is common in the latter 
group. Yet they properly form part of the same section with the Scyllari and 
Palinuri, rather than a separate division as made by Milne Edwards; they differ 
from all the Caridea in the transverse suture across the carapax near its middle. 
The third section—the Caripzea—includes the typical Macroura, which have 
the sides of the carapax not soldered to the epistome, and a large basal scale to 
the outer antenne.* 
* The Cume would constitute another section— Cumidea—if mature animals. But 
according to recent researches of Pref. Agassiz, as he has informed the author, they 
are in some cases, and probably in all, immature forms of Palemon, Crangon, and 
other known Macroural genera. 
