56 MR. T. BELL ON THE CRUSTACEA 
Antenne interiores minutissime. 
Antenne exteriores breviuscule, articulo basilari lamelloso, extus dente triangulari ar- 
mato ; secundo compresso cordato, anticé emarginato, et tertio mult majore ; 
reliquis parvis cylindricis. 
Pedipalpi externi caulis snterni articulo secundo triangulari, extrorsim subproducto. 
Pedes mediocres. Par anticum MARIS....? F@MINE reliquis minus, digitis minute 
serrulatis, digito mobili longiore : paria quatuor posteriora ordine 2.3.4.5. gra- 
datim breviora; digitis subtis minutissime denticulatis. 
Abdomen MARIS....? F@MIN#& 7-articulatum. 
The relation of this genus to Micippa, Leach, and Paramicippa, Edw., is very 
striking. It agrees with them in most of its essential characters, as well as in its ge- 
neral aspect ; but is readily distinguished from them by the form of the rostrum, which 
in those genera is large and deflexed, whilst in Othonia it is extremely small and hori- 
zontal. There are two species in the collection brought from South America by 
Mr. Cuming, of each of which two female specimens only were found: the characters 
of the anterior feet and of the abdomen must therefore at present be confined to those 
of that sex. 
OTHONIA SEX-DENTATA. 
Tab. XII. Fig. 1. 
Oth. teste margine laterali dentibus sex triangularibus acutis. 
Pitho sexdentata, Bell, in Proc. Zool. Soc., Part iti. p. 172. 
Hab. ad Insulas Gallapagos dictas. 
? Mus. Soc. Zool., Bell. 
Carapax broadly oval, moderately elevated, the surface rough, granulated, and slightly 
hairy ; the lateral margin with six flattened triangular, falciform teeth, the points acute 
and directed forwards; a ridge of prominent eranulations over the posterior margin. 
Rostrum very small, bifid, with a small sulcus continued backwards from the division. 
Orbits with a broad triangular fissure above, the tooth on each side flattened and trian- 
gular, the outer one the larger. Eyes not larger than the peduncles, which are elon- 
gated, slender, projecting forwards and slightly curved inwards. 
Internal antenne extremely minute, and placed far back bebg 
ternal antenne hairy, short, the basilar joint broad and flat, ga triangular external 
tooth, which extends forwards as far as that of the orbit ; second joint flat, cordate, 
anteriorly emarginate for the insertion of the third joint, which is also compressed, and 
much smaller than the previous one: the remaining joints are small and cylindrical. 
External pedipalps with the outer footstalk gradually acuminated : the inner footstalk 
with the first joint rather broad and rhomboidal ; the second triangular with the an- 
terior angles somewhat produced. 
Abdomen (in the immature female) oval, consisting of seven nearly equal articulations, 
the rostrum. Ex- 
