684 The Smithsonian Institution 



by the author to nine genera, two of which, Karlia and 

 Ogygopsis, are new. The latter genus is founded on Ogygia 

 klotsii, Rominger. It differs from Ogygia in having a well- 

 defined ocular ridge, and in the narrow palpebral lobe. 



A second paper, issued in the same year, describes a fossil 

 Lingula which preserves the cast of the peduncle. The 

 specimen shows the interior of the anterior portion of the 

 ventral valve of the Lingula cequalis, Hall, collected near 

 Rome, New York, from the upper portion of the Lorraine 

 Terrane. The portions of the shell remaining in the mat- 

 rix show the median ridge extending back from the divari- 

 cator muscular scar, the reflex portion of the shell forming 

 the false area and the groove for the passage of the peduncle. 

 The portion of the peduncle preserved is nearly as long as 

 the entire length of the shell. 



The " Proceedings of the National Museum " for the fol- 

 lowing year (1889) contains descriptions by the same author 

 of new invertebrate forms from the Trenton limestone, and 

 from the Olenellus zone of North America. The material 

 from the latter horizon consists of corals, trails, burrows, and 

 tracks of animals, shells, and trilobites. Twenty-four new 

 species were recognized, which were referred to twenty-two 

 genera. Of the latter three were new, comprising one trilo- 

 bite, Avalonia, and two shells, Coleoloides and Helenia. 



New forms of Upper Cambrian fossils appeared in 1890, 

 and the discovery of Oldhamia in America was published in 

 1 894. The specimens referred to in the latter paper are pre- 

 served as casts on the surface of a smooth siliceous slate. 

 They were found in great abundance in the gorge of the 

 Poestenkill, near Troy, New York. The slates are post- 

 Lower Cambrian and pre-Trenton, but their exact strati- 

 graphic position is not fully determined. But one species is 

 described. It is closely related to Oldhamia antiqua of the 



