REPORT ON THE ANOMURA. 181 



Uroptychus gracilimanus, Henderson (PI. XXI. fig. .'3). 



Diptychus gracilimamis, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 420, 1885. 



Characters. — The carapace is smootli and glabrous as in the last two species, and 

 armed only with a single small tooth at each antero-lateral angle. The gastric area is 

 slightly raised above the level of the rostrum, but is without any definite anterior margin. 

 The rostrum is horizontal, and extends for about one-third of its length beyond the ends 

 of the eye-stalks ; it is rather narrow at the base, and tapers gradually towards the acute 

 apex. The pterygostomial region presents a slight depression towards its centre. 



The chelipedes are remarkably long and slender, and there is no trace of armature, 

 the joints being everywhere smooth and glabrous. The palm is only about three-fourths 

 the length of the carpus and but slightly dilated ; the fingers are pubescent, slightly 

 curved, and rather deeply excavated below, while a compound tooth of considerable size 

 exists on the proximal and inner margin of the dactylus. The ambulatory limbs are 

 slender and elongated, with a few horny spines on the posterior margin of the propodi ; 

 the dactyli are strongly curved and scarcely half the length of the penultimate joint, while 

 a series of short horny spinules occurs on their posterior margin. 



The eyes are of rather small .size, and the corneas are deep brown in colour. The 

 antennal acicle is acuminate, and scarcely reaches the end of the peduncle ; the flagellum 

 is but slightly longer than the peduncle. The external maxillipedes are unarmed. 



The abdominal segments are smooth and glabrous externally, and their pleura are 

 subobtuse. 



This species is distinguished from Uroptychus australis by the great length and 

 tenuity of its chelipedes, and the absence of minute tubercles from their basal joints. It 

 may possibly be only a variety of the last species, but in none of the female specimens 

 of the latter do the chelipedes assume so slender a form, and the material at my disposal 

 therefore makes me inclined to regard it as distinct. 



Breadth of carapace 8 mm., length of body (including rostrum) 22 mm., of carapace 

 (including rostrum) 10 "5 mm., of chelipede 50 mm., of chela 19 '5 mm., of first ambulatory 

 leg 1 9 mm. , diameter of ova about 1 mm. 



Habitat. — Station 164b, oflP Port Jackson ; depth, 410 fathoms ; bottom, green mud. 

 A female with ova. 



Uroptychus tridentatus, Henderson (PI. VI. fig. 1). 



Diptyclius tridentatus, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 421, 1885. 

 Characters. — The carapace is smooth and glabrous, and its surface is unarmed. The 

 rostrum is about one and a half times the length of the eye-stalk, and slightly depressed, 

 with its apex tridentate, and the upper surface hollowed out from side to side. The 



