BY HENRY WOODWARD. 303 



adheres firmly to the matrix, and is therefore seldom to be seen 

 or studied. 



The new form, from the Cretaceous beds of Queensland, may 

 be thus described : — 



Carapace, or cephalothorax — general form oval, truncated 

 behind; the cephalic, gastric, hepatic and cardiac regions covered 

 with smooth wart-like excrescences ; the branchial regions 

 " quadrant "-shaped and tuberculated ; the branchial furrow, 

 separating the hepatic, cardiac, and branchial regions, strongly 

 marked ; the nuchal furrow, separating the frontal and orbital 

 regions from the hepatic, is less marked. Length along the 

 median line of the carapace, 40 millimetres ; greatest breadth of 

 carapace, 35 ram. ; breadth of posterior border, 28 mm. 



The frontal, or cephalic portion of the carapace is rounded, and 

 but very slightly prominent, and is marked by two smooth, 

 sub-central, elongated, wart-like prominences on the median line, 

 their extremities forming the obtuse rostrum, and flanked by 

 three or four smaller rounded tubercles irregularly disposed over 

 the orbital region. The orbits are not distinctly marked. 

 Immediately behind the frontal (rostral) swellings, are four 

 smooth, elongated, rounded, sub-central prominences, upon the 

 epigastric region, the two inner ones being narrow and ridge-like, 

 with their longer axes parallel to the median line, and the two 

 outer ones lying parallel to them, but larger and more oval in 

 outline ; behind these again and marking the median line, and the 

 centre of the gastric region, is a single, small, smooth, rounded 

 tubercle, flanked by two sub-central, transversely-elongated, some- 

 what elliptical prominences (like eyes), each having a small 

 tubercle upon its summit ; these are followed by two other similar 

 sub-median, transversely-elongated prominences, widest next the 

 median line, each (like the preceding pair) bearing an eye-like 

 tubercle on its centre. The gastric region is bounded behind by a 

 narrow, transversely-elongated, crescent-shaped prominence, the 

 horns of which are directed slightly forward and bearing a single 

 tubercle upon its centre. The hepatic region is marked by one 

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