ATTSTBALIAN MALACOSTKACA. 27 



two, somewhat larger, granules, placed one behind the other, 

 and f ollowod by one on the cardiac region ; there is also one on 

 each branchial region ; the lateral and posterior margins are 

 granulated ; the fissures of the upper orbital margins are very- 

 small ; the rostrum is broad, spatulate, obliquely deflexed, with a 

 small triangular notch at its distal end, and with its antero-lateral 

 angles rounded, without teeth or spines. The anterior legs (in 

 the female) are very small and smooth ; the ambulatory legs are 

 densely hairy. Length about six lines. [Jf.] 



Bass' Straits (H.M.S. " Challenger"). 



Family III. PERICERIDJ8. 



Eyes retractile within the small circular and well defined orbits, 

 which are never incomplete as in the Maiidce. Basal antennal 

 joint well-developed, and constituting the greater portion of the 

 inferior wall of the orbit, usually considerably enlarged. 



Sub-Family Pericerinm. 



Carapace more or less sub-triangular in shape. Rostrum well- 

 developed. Second joint of antennae not dilated. Anterior legs 

 with the fingers acute at the tips. 



Genus Tiakmia, Dana. 



Carapace sub-triangular, without a distinct series of lateral 

 spines. Spines of rostrum very slender and contiguous. Inter- 

 orbital space broad. Basal joint of the antennae broad at the 

 apex but unarmed. Anterior legs in male with the palm short ; 

 fingers gaping. Ambulatory legs nodose or spinose. 



44. Tiarinia mammillata. A.M. 



Tiarinia mammillata, Haswell, Proc. Linn. Soc. N".S."W\, 

 Vol. iv., p. 448. 



Carapace sub-triangular, broad behind, ornamented above with 

 pointed and mammiform tubercles, a cross formed by six of these 

 on the gastric region ; cardiac region with a prominent eminence 

 crowned by three rounded tubercles placed close together. 

 Cornua of the rostrum about half of the length of the post- frontal 

 region of the carapace, slender, pointed, contiguous throughout 

 their length. Orbit with a prominent pointed, slightly curved 



