272 RECORDS OF THE AUSTRALIAN MUSEUM. 



The anterior of these curves towards the nuchal on each cara- 

 pace half, gradually lessening in consj)icuouKness but still 

 reaching the nuchal just before its anterior turn forvvai'ds. 

 The posterior niesobranchial is continuous across the entire 

 cax'apace from niai-gin to margin, distinctly sigmoidal, and 

 deep at its extremities, faint and somewliat concavely curved 

 in its median portion on eacli half of the carapace ; these two 

 principal furrows, the mesobranchial and nuchal are united 

 immediately above each latero-ventral maigin by a short trans- 

 verse furrow tending to sef)ai'ate off and hel])ing to form llie 

 small epibianchial lobes. The cephalic lol)e8, anterior to the 

 nuchal furrow ai'e, accepting the iniclial as a base line, obtusely 

 triangular and highly scabrous, the tubercles lai'ge and close. 

 The niesobranchial lobes enclosed between the funows of the 

 same name and the nuchal ai-e roughly parallelogramatic, the 

 tubercles resembling those of tlie cephalic lobes. 



Between the mesobranchial and epibranchial lobes occur two 

 small more or less round, or pear-shaped lobes foi-med by the 

 junction of the anterior niesobranchial furrow above and the 

 posterior below with the nuchal. 



The large branchial region is highly scabrous, l)ut tlie 

 tubercles are certainly sinallei' than those of the cejjhalic or 

 mesobranchial portions. 



The genus E)t(>iihic]\jtla was established by McCoy- to receive 

 tlie well-known Astacus lenrhii, ^Jantell, of tlie Lowei' Chalk. 

 The absence of the rostral portions in the present specimen is 

 unfortunate, as here are situated some of the pi-incipal ]iarts 

 relied on by McCoy for the separation and support of his 

 genus. Howevei', the double brancliial fuiiows (liere termed 

 mesobj-anchial after Prof. 'J\ liell) dcsciii>tMl in l', u^fliH-l ijl'm, 

 are unmistakably present in tlie Queensland Crustacean, and 

 although McCoy's figui-e is a more or less diagraniatic one, 

 the fui'i'ows in question are well shown. It is in the figures of 

 Reuss, (leinitz, and Fiitsch and Kafka that similai' characters 

 to those of our specimen are so ap])arenl. 



a McCoy— Ann. Mag. Nat. Hist., iv. (2), 1849, p. 330, fig. 



