CRUSTACEA. 31 



Chelis longissimis et maximis, prismaticis, jiigis angularibus, tuberculis rotundis, subobtusis, ex ordme 

 dispositis, arniatis ; quatuor posteribus pedum, paribus gracillirois parvis, pari longitudine, et omnino celatis 

 sub lateralibus lamellaribus extensionibus thoracis. 



Aidomine lsevi, septem articulis, serie parvorum tuberculorum ad utrumque latus subemineutis inter- 

 niedise linese : articulo penultimo ceteris latiore. 



Yivus colore turbide-carneolo, fuscis distinctionibus, et minutis nigris punctis ; in utraque chela crocea 

 lineari macula ; superficie inferiore alba, subrubro colore in pectore. Siccatus obscuro, turbido, albo 

 colore est. 



Hab. Mare Suluense ; fundo scruposo. 



Carapace flattened, very large, triangular, slightly elevated in the middle, nearly twice 

 as wide as long, slightly sinuated posteriorly, strongly marked round the edges with coarse, 

 rounded crenations ; the greater part of the back covered with slight pustular elevations ; on 

 the posterior part of the carapace two deep grooves, placed longitudinally, and slightly bent, 

 so as to have a lyre-shaped form. 



Front horizontal, much produced, rounded anteriorly, and having three rather sharp 

 crenulations on either side, eyes small, retractile. 



Fore-legs very long and large, prismatic in form, with the angular ridges armed with 

 regular, round, rather blunt tubercles ; the four hind pairs of legs very slender, small, 

 equal in length, and entirely concealed beneath the lateral lamellar extension of the carapace. 



Abdomen smooth, seven jointed, with a row of small tubercles on either side of the 

 slightly prominent, middle line ; penultimate joint wider than the rest. When alive it is 

 of a dirty flesh-colour, with brown markings, and minute black specks ; on each chela there 

 is an orange, linear spot ; the under surface is of a dead white, with a reddish tinge on 

 the breast. In the dried state it is of a dull, dirty white. 



Hab. Sooloo Sea; twenty fathoms, stony bottom. 



The species of this genus resemble those of Calappa, in their habit of simulating death 

 when disturbed, folding the chelae close to the front of the carapace, and concealing their 

 legs under the ddated sides of the carapace. They are always found in deep water, while 

 the Calappidce are observed on sandy flats, under the shelter of stones, or even sometimes 

 buried in the sands. 



In the distinct and beautiful species of the singular genus described above, the lyre-shaped 

 grooves on the carapace at once distinguish it from the other two known species ; it, however, 

 differs from the Cryptopodiafornicata of Herbst, and the C. angulata of Edwards and Lucas, in 

 other and minor particulars. The carapace is narrower and wider than the same part in C./or- 

 nicata, and the posterior edge is furnished with coarser and rounder crenations, the ridges on 

 the chelae have blunter tubercles ; the front, moreover, is longer, more rounded in outline, and 

 more deeply crenulated. Prom C. angulata, Edwards and Lucas, (Archives du Museum, vol. ii. 

 t. 28. f. 15-19,) described in 1841, it differs in the rounded form of the posterior portion of 

 the carapace, which, in that species, is sharply angulated and spiniferous, and also in the 



