CRUSTACEA. 
19 
below, fingers gaping, the lower one curved, with closely-set teeth at one end, but without 
teeth at the base ; upper one with several teeth at the end, a large, thick tooth near the base, 
and a deep sinus between them ; third joint of the hind-legs with two tubercles on the upper 
surface near the base ; second pair of legs longer than the others. 
Hab. Philippine Islands. 
In this species the sides are armed with tour broad, rounded teeth placed befoie the 
lateral spine, while in M. porcellus there is but one tooth anterior to the spine, and in M. tuber - 
culatus there are two large, prominent teeth ; the carapace is more elongated in the males 
than in M. porcellus or M. tubercidatus, the frontal spine is much longer, and the tubercles 
on the back are smaller and less rounded. The young female of this species appears to be 
the M. diadema, Leach, MSS., where the carapace is subtetragonal, nearly as wide as long, 
strongly embossed with numerous tubercles of different sizes, and with the frontal spine short 
compared with the male and adult females. 
2. MENyETHIUS PORCELLUS, Adams fy White. 
Thorace trigonali, longiore quam latiore, antiee producto, posticc rotundato ; parte superiore complu- 
ribus, magnis, rotundatis tuberculis obsita; lateris marginc mui, valid a spina, magno, obtuso, conspicuo 
dente ante spinam ; lateribus post cantlios angustatis. 
Fronte tribus dentibus ex eadem planitie surgentibus; medio admodum elongato, acuminato, ad fincm 
inclinato, longitudine fere tertia parte thoracis, setis curvatis ad utrumque latus ciliato, velut in Huenia ; 
spinis lateralibus admodum validis et acutis, ad utrumque latus prorsum directis ; basi pedum duobus vel 
tribus tuberculis in latere exteriore ; secundo pari ceteris longiore. 
Hab. Mauritium. 
Carapace trigonal, longer than wide, produced anteriorly, rounded behind, upper part 
very irregular, and covered with numerous large, rounded tubercles ; side-margin with one 
strong spine, with a large, blunt, conspicuous tooth before it ; sides narrowed behind the orbits. 
Front with three teeth arising from the same plane, the middle one very much elongated, 
pointed, bent down at the end, about a third the length of the carapace, ciliated on both sides 
with curved setae, as in Huenia ; the lateral spines very strong and sharp, directed forwards 
on either side, base of legs with two or three tubercles on the outer side, second paii longei 
than the others. 
Hab. Mauritius. 
The existence of a single well-formed, strong tooth, situated anterior to the lateral 
spine, serves to characterize this species. 
3. MENiETHIUS TUBERCULATUS, Adams 8f White. 
Thor ace sub trigonali ; lateribus duobus, depressis, augularibus dentibus ante spinam lateralem, quse 
obtusa est. Regione cardiaefi et ventriculari duobus autice tuberculis, uno ad utrumque latus lineaj media; ; 
crista vertieali tuberculo minuto, altero post admodum prominente et rotundato, et tertio post alterum 
paullo minore; posteriore thoracis margine duobus, erectis, angularibus dentibus. . 
Fronte tribus spinis cx eadem planitie surgentibus ; media longa, graeili, mclmata atque in medio 
sulcata ; spinis lateralibus altioribus validis, triangularibus, duobus inter eas parvis tuberculis. 
IIab. Mauritium. 
