d 
-" o4 
B 
i | Zoology. 433 
G. 3. PEnINIA, Dana.*—Carapax orbiculato-ovatus, tuberculis pau- 
cis non acutis ornatus, rostri cornubus brevibus, discretis. Ar- 
ticulus antennarum ext. Imus oblongus, apicem non latior, an- 
gulo externo valde producto.  Orbita anticé aperta, margine 
superiore non unifisso. 
G. 4. lIIArniuvs, Latreille.—Carapax triangulato-ovatus, cornubus 
rostri grandibus, divarieatis. — Articulus antennarum ext. 1mus 
angustus. Articulus pedum 8 posticorum 5tus valde compres- 
sus, processu infra non armatus. 
G. 5. PusETTIA, Dana.t—Carapax triangulato-ovatus. ^ Rostro 
antennisque ext. Halimo afünis. Articulus pedum 8 posticorum 
Btus cylindricus. 
3. MEN/ETHIN/E.— Rostrum integrum aut subintegrum. 
G. 1. MEN zrnivs, Eidwards.—(Carapax triangulato-ovatus, depres- 
sus, regione antero-laterali plicis tribus plus minusve ornatá. 
Pedes 8 postici cylindrici. $ 
G. 9. AcauTBonNvx, Latr.—Carapax depressus, non tuberculatus, 
sive subtriangulatus sive subquadratus (dente post-orbitali dila- 
tato), regionibus non conspicuis, dente przorbitali parvulo, ros- 
iro crasso, apice emarginato. Pedes 8 postiei mediocres, 
articulo penultimo compresso, infra dilatato et sepe dentigero. 
G. 3. AunTiLIBINIA, M" Leay.S— Carapax valde convexus, regionibus 
non conspicuis, latitudine transorbitali minore (lat. max. 3plo 
latiore), rostro crasso, apice emarginato. — Articulus pedum 
8 posticorum penultimus infra non dilatatus nec dentigerus. 
G. 4. PgrriN1A, Dana.||—Carapax depressus vix tuberculatus, dente 
praeorbitali breviter instructus, latitudine transorbitali majore (lat. 
max. 9plo latiore), rostro lato, profundé bifido, sat brevi. Ar- 
ticulus pedum 8S posticorum penultimus infra non dilatatus nec 
dentigerus. - 
B. Antenne externe sub rostro celata. 
1. Oculi przelongi. 
4. STENOCIONOPIN 7E.— Rostrum longum, furcatum, cornubus styli- 
formibus, divaricatis. 
G. SrENocroNoPs, Latreille.—Carapax subpyriformis, gibbosus, 
spiná preeorbitali longissimá. Articulus antennarum ext. ob- 
longus. 
2. Oculi aut longitudine mediocres aut perbreves. 
5. EPIALTIN/E.—Rostram oblongum, crassum, sive integrum sive 
emarginatum.  Antennz ext. apicem rostri szepius non attin- 
gentes. Pedes 8 postici subcylindrici. 
* This volume, p. ?'71. 1 Ibid, p. 268. 
I The genus ApAus of Eydoux and Souleyet, as figured in the plates of the 
Voyage of the Bonite, has the beak, praorbital spine or tooth, outer antenne, and 
general form of Menzthius. But the eyes may be longer pedunculate, and as there 
is no description, it is not apparent whether they are retractile or not. "The species 
is called Xiphus margaritiferus. The beak is pointed, and the 3d basal joint of the 
outer antennz reaches to apex of beak. 
8 Smith's Illust. S. Af. Zool. | This volume, p. 272. 
SEcoxpn Szzizs, Vol. XI, No. 33.—May, 1851. 56 
