256 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 10, 



Orthis, several species, 

 (testudinaria? striatula? &c.) 



Atrypa. 



Lingula, one species. 



Delthyris. 



Encrini. 



Graptolites, two species. 



And an abundant variety of corals 

 of several genera and species. 



Cystolites ornatus. 

 Strophomena sericea. 

 nasuta ? 



Orthoceras, more than one species. 



Trochus } 



Pterinea carinata. 



Cypricardia angustifrons. 



^lor^ ovata. 



■ Orbicula ? 



Some of the above were remarkably well preserved in the marl, 

 which is here almost entirely an argillaceous deposit. The Trinucleus, 

 which at other elevations is seen only with its singularly-formed 

 buckler, so highly ornamented, was here found attached to its pos- 

 terior ribs, and with delicately sharp spinous projections from each 

 end of the buckler nearly an inch in length. Triarthrus Beekii, 

 which in the lower part of the deposit has generally presented a head 

 merely, or the ribs unconnected with a head, was here completely 

 perfect. Lingulae were in nearly every instance found, not parallel 

 with the strata, but standing up, as if they had been entombed while 

 growing in their usual position, and so quietly as not to disturb or 



throw them down. Calymene 

 were seldom found rolled up, 

 or distorted in any way, and 

 a dozen were sometimes seen 

 on one side of a slab of marl 

 four or five inches square, all 

 beautifully spread out as if in- 

 tended for cabinet specimens 

 by nature herself. The 7*o- 

 teles megistos exhibited both 

 spinous terminations of the 

 shield well-defined. Grap- 

 tolites were in the greatest 

 abundance, and one species 

 was peculiarly delicate and 

 hair-like ; in short, all were 

 preserved in primaeval perfec- 

 tion, untouched by the cor- 

 roding tooth of Time. 



The most interesting of all 

 were the Orthocerata, which 

 were frequently of unusual 

 size, measuring over three feet 

 in length ; they all appeared 

 more or less compressed as if 

 by the weight of the super- 

 imposed strata, and their dia- 

 meter when thus flattened was 

 frequently over six inches. 

 The surface was often coated 

 with a black substance, like 



