CRUSTACEA. 
55 
upper surface sharp and granular ; under surface thin and tuberculated ; inner surface concave, 
with two finely granulated parallel lines ; outer surface convex, with two rows of holes, and 
two series of tuberculated lines. 
Abdomen (of female) convex, wide, divided into about six pits by strong reticulations 
formed of granuliferous lines. 
Hab. Straits of Sunda. 
3. IXA, Leach. 
1. IXA MEGASPIS, Adams Sf White. (Tab. XII. Pig. 1.) 
Thorace subgranuloso, canaliculis dorsalibus angustis valde profundis, postice linea impressa profunda 
transversa ; lateribus valde productis granulosis retrorsum inclinatis, finibus obtusis, dente terminali parvo 
curto. 
Hab. Borneonem. Insulas Philippinas. 
Carapace subgranular, the channelled grooves which separate the middle from the 
lateral regions very deep and narrow, a deep transverse posterior groove, the lateral prolonga- 
tions granular, inclined backwards, long and slender, the ends obtuse, and slightly curved 
forwards, the stiliform tooth at their extremities very short and small. 
Hab. Borneo (Tampasook) ; Philippines (Bohol). 
The species, when alive, has the carapace of a light red colour, with dark crimson in the 
middle, the lateral prolongations of the carapace being purple, with orange tips : the legs are 
bright red. It differs from the Ixa cylindrica in the lateral prolongations being inclined 
backwards, more slender and longer, the ends more obtuse, and curving forwards, the 
terminal spine is much shorter and smaller, the surface of the carapace is less granular, the 
middle region is not so deeply notched on each side, the dorsal grooves are narrower and 
deeper, and the hind groove is more transverse. 
4. HAB.RO VI A, Adams Sf JVhite. 
Tliorace subpentagono, dense tomentoso, lineis duabus elevatis, tuberculisque quatuor obtusis ; margi- 
nibus latero anterioribus dentibus tribus obtusis. 
Fronte valde recta in medio emarginata, angulo cantbi externe prominente dentiformi. 
CheUs granulosis, brachio supra spinis duabus interne spina duplicata, carpo tuberculo unico, manu 
eylindricea sulcata, digito ad basin tuberculo parvo externe. 
Carapace subpentagonal, densely tomentose, with two transverse raised lines on the 
upper surface, each ending externally in a prominent blunt tubercle, and two faintly-impressed 
lines posteriorly ; latero-anterior margins with three obtuse teeth, the anterior small and 
rounded, the middle large and more prominent, and the posterior strong and conical. 
Front very straight, emarginate in the middle, the inner angle of the orbits forming a 
strong tooth in the same line as the front. 
