AUSTRALIAN MA1AC0STEACA. 29 



Bostral cornua styliform, parallel and contiguous throughout 

 all their length. Carrapace covered on its borders, as well as 

 below, with more or less pointed tubercles, dilated and rounded 

 behind. Teeth of the anterior angle of the superior orbital 

 border, small, pointed and recurved. Basal joint of the external 

 antennse armed with a terminal spine ; second joint enlarged 

 towards the extremity, and scarcely longer than the third. Legs 

 ornamented with tubercles or spines on their third joint : those 

 of the second pair in the male once and a half as long as the 

 following pairs. 



Port Darwin (Macleay Museum). Found also in the Indian 

 Ocean. 



47. Tiarinia elegans. 



Tiarinia elegans, Has well, Proc. Linn. N.S.W., Vol. vi. 



Carapace elongate-triangular. Surface pitted, especially on 

 the branchial and cardiac regions ; gastric region with several 

 small tubercles, the largest situated in the middle line near the 

 posterior boundary of the region, laterally compressed, sub-acute ; 

 cardiac region with a prominent conical elevation ; branchial 

 regions each with two conical prominences with a small tubercle 

 in front of them, placed in an oblique line. Rostrum forming 

 about one-third of the length of the entire carapace, formed of 

 two slender cornua which are contiguous to near the apex, where 

 each curves outwards and ends in an acute point. Upper orbital 

 margin not prominent. Arm punctate, with a few tubercles 

 above and below ; hand punctate, compressed, with a tooth above 

 the articulation with the wrist. Fingers widely gaping, meeting 

 only at their tips. Ambulatory legs long and slender, with a few 

 scattered tubercles on the third joints. Length 9/16ths inch ; 

 greatest breadth 5/10ths inch. 



Off Broughton Islands, near Port Stephens, dredged in 

 twenty-five fathoms. 



Sub-Family Mithracince. 



Carapace broadly triangular, sometimes transverse, with the 

 sides slightly arcuate ; interorbital space narrow. Bostrum short 

 or obsolete. Second joint of antennre not dilated. Anterior legs 

 with the fingers excavated at the tips. [_2f.] 



