1872.] WOODWARD NEW TRILOBITE. 31 



Fig. 2. Outline figure of underside ( $ ), restored on the same scale as fig. 1 . 



3. Outline figure of part of underside ( $ ), on the same scale as fig. 1. 



Fig. 3a. One of the maxillipeds, enlarged. 



4. Dorsal aspect of a smaller example ( Q ). 



5. Ventral aspect of the same, showing the broad abdomen and the maxilli- 



peds. 



6. Ventral aspect of another specimen (3), showing the narrow abdomen 



and the maxillipeds. 

 All the specimens are drawn of the natural size. 

 Figs. 4, 5, and 6 are not in any way restored. 



The above are all from the collection of C. J. A. Meyer, Esq., F.G-.S., and 

 obtained from the Lower Eocene of Portsmouth. 



Plate II. figs. 1-5. 



Fig. 1. Litoricola glabra, H. Woodw. Dorsal aspect (the only specimen at 

 present obtained). 



2. dentata, H. Woodw. Dorsal aspect. Fig. 2 a. The same. 



Ventral aspect. 



3. . Dorsal aspect of a much smaller individual, in which the 



legs are preserved. 



4. . Ventral aspect of another specimen, showing the dis- 

 parity in the size of the chela? on the opposite side to that in fig. 2 a. 



5. ? Another specimen, perhaps belonging to a, third species (?), 



in which the hands are of nearly equal size (? ? ). 

 All drawn of the natural size ; and all from the Lower Eocene of Portsmouth. 

 Fig. 1 from the Collection of Caleb Evans, Esq., F.G-.S. 

 Figs. 2-5 from the Collection of C. J. A. Meyer, Esq., F.G.S. 



Discussion. 



Mr. Meyer gave some particulars as to the horizon from which 

 these fossils were derived. They all came from the argillaceous 

 sands with Dentalium, mentioned in his former paper. These beds 

 are much mottled, probably owing to the burrowing of the crabs. 



Mr. Woodward, in answer to inquiries, pointed out that these 

 crustaceans were of purely littoral, and uot of pelagic forms, and 

 their feet were in a condition better adapted for walking than for 

 swimming. The long epibranchial spines formed weapons ot offence, 

 and were of much service to the pelagic forms, though their retention 

 in the littoral forms was not of easy explanation. The Litoricolce 

 were essentially adapted for running on land and burrowing. As 

 an instance of the disparity in the hands of Crabs, he instanced the 

 common Calling Crab, which had always one hand greatly larger 

 than the other. 



4. On a New Trilobite from the Cape of Good Hope. 

 By Henry Woodward, Esq., F.G.S. 



[Plate II. figs. 6-7.] 



Since the contributions to the 'Transactions' of this Society, by the 

 late Mr. J. W. Salter, in 1852*, I do not remember that any Trilobites 

 have been described from the Cape of Good Hope. 



* Read November 17, 1852, see Trans. Geol. Soc. vol. vii. second series, p. 175. 



