376 Geological Society. 



When moderately distended with air, its shape was made manifest, 

 as trilobed, or rather, as consisting of one large central bag, from 

 each side of which, a conical process jutted out ; the extent from 

 point to point being 1 foot 10 inches. It opened by a neck of about 

 3 inches in length, and closely invested with lung, into the cloaca, 

 about 6 inches from its termination ; the penis was long and deeply 

 furrowed, and the glans large at the base, with a pointed apex. 



The lungs were very florid in colour, and extremely light, spongy, 

 and cellular, the cells being large and distinct. They extended the 

 whole length of the carapace. 



The kidneys were situated at the back of the abdomen, in shape 

 oval; flat on one side, convex on the other; about 5 inches long, 

 2^ inches broad, and consisting of numerous lobes, which gave to 

 their surface a furrowed or brain-like appearance; the relative 

 proportion of the venous ramification in them was found to exceed 

 that of the arterial. 



As regards the death of the animal, nothing positive could be 

 determined ; but it appeared to Mr. Martin, from the black patches 

 about the colon, and the quantity of undigested matter in the large 

 intestines, to have resulted principally from an unnatural accumu- 

 lation of faecal matter, and the attending evil consequences. 



GEOLOGICAL SOCIETY. 



March 2nd. A paper was first read On the rippled markings of 

 many of the forest marble beds north of Bath, and thefoot-tracks of 

 certain animals occurring in great abundance on their surfaces. By 

 George Poulett Scrope, Esq., F.G.S., F.R.S. 



The wavy and wrinkled figuring of these and other sedimentary 

 strata, the author considers to be identical in all its various acci- 

 dents, as well as in its origin, with the markings of the sea-sands 

 exposed at low tide on many of our shallow shores. He attributes 

 it to the vibratory movement of the lower stratum of water, when 

 agitated by winds or currents, by which sediment, either in the act 

 of precipitation or stirred up from the bottom, is led to arrange 

 itself in ridges corresponding to the intervals between the contigu- 

 ous arcs of oscillation. 



Since it cannot be supposed that such movements reach to any 

 very considerable depths, these ripple-marks make it probable that 

 the beds in which they occur were formed on a shallow shore ; and 

 this idea is further confirmed, and their analogy with the littoral 

 deposits of our modern coasts brought still closer, by their compo- 

 sition of rolled fragments of shells, of corals, spines of echinus, and 

 Crustacea, by the imbedded remains of fuci, and above all by the 

 frequent intersection of their surfaces by the sharp well-defined and 

 fresh-looking tracks of some small animal, impressed upon the sand, 

 apparently when left dry by the ebbing of the tide. 



Here then, says the author, we have brought together in the 

 compass of a small slab, several interesting memoranda of the day, 

 however distant, when the waves of the ocean were beating against 



a line 



