36 ZOOLOGY OF THE VOYAGE OF H.M.S. SAMABANG. 



in medio crassis obtusis tubercuhformibus processibus, postice desinentibus in longa prominente acumi- 

 nata spina extrorsum et paululum retrorsnm directa ; acie posteriore octo validis spinis instructs, marginibus 

 thoracis, cum tuberculis et spinis, fimbriatis longis rigidis subcurvatis setis. 



Fronts acuminate triangulari, aciebus subcrenulatis et valida spina supra canthum. 



Chelis ter thorace longioribus ; bracbiis serie crebrorum sequorum tuberculorum antice ; quatuor vel 

 quinque magnis rotundatis tuberculis, paululum inter se distantibus in latere exteriore, quinque validis 

 spinosis processibus a margine posteriore retrorsum et extrorsum tendentious ; carpo serie tuberculorum 

 supra, et tribus validis spinis externe ; manu crista octo validarum spinarum supra, serie tuberculorum 

 interne, et serie fere duodecim crassarum obtusarum spinarum in acie inferiore. 



Pedibus posterioribus gracilibus minoribus, duobus posterioribus paribus longis subcurvatis setis 

 fimbriatis. 



Aidomine (in mare) quinquarticulato, crebris setis circum margines. 



Hab. Maria Orientalia. 



Carapace subtriangular, anteriorly acuminate, somewhat angulated at the sides, wide 

 behind, covered with rounded equal-sized tubercles, larger in the middle and branchial regions, 

 the sides anteriorly crenated, armed in the middle with thick, obtuse, tuberculiform processes, 

 and ending posteriorly in a long, prominent, acuminated spine, directed outwards and a 

 little backwards ; posterior edge with eight strong spines and tubercles, the spines fringed 

 with long, rigid, slightly curved hairs* 



Front acuminately triangular, the edges subcrenulated, and with a strong spine above 

 the orbit. 



Fore-legs three times longer than the carapace, the third joint with a row of equal-sized 

 tubercles anteriorly ; four or five large rounded tubercles slightly separated from each other 

 on the outer surface ; five strong spiny processes, extending backwards and outwards from 

 the hinder margin ; the third joint with a row of tubercles above and three strong spines 

 externally ; the fifth joint with a crest of strong spines above, a row of tubercles internally, 

 and a row of about twelve thick, obtuse spines on the lower sharp edge. 



Hind-legs slender, rather small, the two posterior fringed with long slightly curved setee. 



Abdomen (in the male) five-jointed, the crenated margins beset with short hairs. 



Hab. Eastern Seas. 



IV. CANCERID.E. 



In their habits, the Canceridtz are evasive and prone to concealment, passive in defence, 

 and though voracious and predatory, they do not exhibit the same activity, intelligence, and 

 cunning as the Ocypodidce, the Gonoplacidtz, or the Grapsidce. The (Ethrce inhabit deep 

 water, living in sandy mud, among shells and coral debris, while such genera as Carpilius, 

 Atergatis, Xant/io, and Chlorodius, select shallow waters along the shores, preferring weedy 

 and rocky bottoms, where they hide among the stones, and prey on shrimps and small fishes. 

 Pilumnns and Trapezia are tolerably lively in their movements ; the latter genus having the 



