26 FOSSIL MALACOSTRACOUS CRUSTACEA. 



Species unica. Goniochele angulata, mild. Plate IV, figs. 3 — 9. 



Descr. The carapace of this ambiguous and anomalous species is irregularly hexagonal, 

 rather flat, very deep, broader than it is long, the surface uniformly covered with distinct 

 granulations ; the regions distinct and elevated ; the front projecting, toothed ; the upper 

 margin of the orbit furnished with three teeth, exclusive of that of the exterior angle 

 (or first latero-anterior) ; between the first and second orbital teeth is a deep notch ; 

 the orbit is broad and open, smooth and polished within, the inferior margin entire, 

 semicircular, and terminating outwards in a strong tooth ; latero-anterior margin straight, 

 and furnished with the normal number of teeth; the first (external orbital) triangular, 

 projecting ; the second and third (the two hepatic) very small and inconspicuous ; the 

 fourth (epibranchial) much larger than the foregoing, but not so large as the fifth, which 

 forms a broad triangular spine, from which the latero-postcrior margin extends in a 

 straight line, to meet the posterior margin, which is somewhat waved, and forms a raised 

 border; lobes of the gastric region very distinct and raised; the mesogastric somewhat 

 hastate, and extending anteriorly in a narrow process to the front ; the urogastric 

 transverse, slightly curved, and longitudinally striated ; the cardiac region raised towards 

 the middle, the epicardiac lobe with a distinct, rounded, and conspicuous tubercle on each 

 side, by which this species may be at once distinguished from every other ; the 

 metacardiac lobe with a double tubercle on the anterior portion, and a single one behind ; 

 hepatic region elevated on the centre ; the branchial with a broad, longitudinal, raised 

 portion, almost continuous with the raised epigastric, crossed near the middle of the carapace 

 by a transverse ridge. The pterygostomian process and lateral portion of the carapace are 

 perpendicular and very deep, with a broad, smooth, longitudinal furrow on the upper 

 portion, and a granulated area beneath ; the oral opening nearly square. The eyes, 

 antennae, and footjaws are absent in every specimen I have seen. The abdomen in 

 the male is narrow, linear, the joints all separate, and each segment gibbous in the middle. 

 In the female it is oval, all the segments separate, and raised in the middle. The most 

 remarkable structure is that of the anterior legs, and particularly that of the chelae. 

 The whole limb is considerably compressed ; the arm much broader anteriorly, tuberculated, 

 with a smooth, longitudinal furrow near the outer margin, which is evenly curved 

 and armed with four or five teeth ; the wrist tuberculated ; furrowed, and the margin 

 marked with four conspicuous angles ; the hand triangular, as broad at the anterior 

 margin as it is long, the outer margin with ten teeth, the upper face with a large, smooth, 

 concave, triangular surface, bordered interiorly by a longitudinal, double, granulated 

 carina; the anterior margin very long, oblique, toothed, and opposed throughout its 

 length to the moveable finger, which is narrow, somewhat falcate and toothed at both 

 edges. From the few fragments which exist of the remaining feet, it appears that they 



