0fi p CRUSTACEA. 



minent acute teeth, the feet are long, the first joint of the outer an- 

 tennae is not longer than the second. The aspect is quite different, 

 the carapax appearing harder, and quite as long as broad. There is 

 a prominent spine at inner side of orbit, below the line of the front, 

 and more prominent than the tooth of the front just above. There 

 are no fissures above in the orbital margin. The arm is long (very 

 nearly as long as the carapax), and projects very much beyond the 

 carapax. 



The species have much the aspect of one of the Grapsida? ; but the 

 abdomen and the male sexual appendages are Cancroid, and the re- 

 semblance is close to Trapezia, 



QUADRELLA CORONATA. 



Carapax Icevis, later ihus paululurn arcuatis et medio uni-spinosis, dentin 

 bus fronds sex medianis pauh longioribits, extern is perl re dints, dente 

 infra-orbital i elongato. Pedes antiei elo/tgati, matin angustd, triph 

 longiore queim dimidium corporis, inermi, levri, carpo intu-s 2-spinoso. 

 bracliio ad marginem anticum bene l-spinoso. Pedes post iei fere eylin- 

 drici, articulis subtilissime pubescent ibus, articulo quinto marginibus 

 parce pubescenti, tar so infra spinuloso. 



Carapax smooth, sides slightly arcuate and with a single spine at 

 middle, teeth of the front six the median longest, and the exterior 

 quite short; an elongate infra-orbital tooth just below outer frontal. 

 Anterior feet elongate ; hand narrow, once and a half the length of 

 the body, smooth and unarmed; carpus two-spino.se on inner side; 

 arm with a neat series of seven spines. Posterior feet nearly cylin- 

 drical, very minutely pubescent, fifth joint sparingly pubescent at 

 the margins, tarsus spinulous below. 



Plate 16, fig. 5 a, carapax, enlarged three diameters ; b, under 

 view of part of front, inner antenme, except a portion of base removed; 

 c, anterior leg, enlarged three diameters; </, one of eight posterior legs, 

 ibid. 



Sooloo Sea, or Balabac Straits. 



