1 68 NEW YORK STATE MUSEUM 



Beachia suessanaisan Oriskany species of the Cumberland basin, 

 Maryland. The specimen which has been identified therewith in the 

 Oriskany at Rondout is familiar to the writer but there is no particular 

 reason for assigning it to Beachia rather than to Megalanteris. The 

 simplest expression of these shells is therefore the most southerly. 



For the sake of an expression therefore the term applied to this species 

 will serve. It is evident that the generic distinction between Beachia and 

 Megalanteris is a fugitive one and of little value. Probably it will be found 

 wise to withdraw the former term altogether and express the relations here 

 indicated by specific terms which are even then too exacting. It is not a 

 matter of record that these species have the same character of brachial 

 processes but specimens are before me from the Glenerie Oriskany which 

 show this to be the case. 



Localities. Beachia amplexa is specially common in the purer 

 layers on Dolbel brook associated with Hipparionyx proximus and 

 Rensselaeria. It is not usually found in the shore outcrops. At Perce 

 Rock it is not uncommon. 



Megalanteris thunei nov. 



Plate 26, figures 8-13; plate 27, figures 7-15 



Shells having the aspect of M. o v a 1 i s often with more convex ventral 

 valve are distinguished chiefly by numerous generally fine radial plications 

 covering the entire surface except the umbones. This feature is highly 

 developed and is not connected by gradation with the smooth exterior of 

 M. o V a 1 i s . The internal markings are essentially as in the other species, 

 the ventral adductor scar being even more conspicuous, the cardinal plate 

 less developed. 



Localities. From the shore outcrops at Grande Greve and from Perce 

 Rock. 



Species name. Exuperius de Thune, Recollet missioner at Perce, 1670. 



Camarotoechia cf. ramsayi Hall 



Plate 28, figure 9 



See Rhynchonella ramsayi Hall. Palaeontology of New York. 1859. 3:446, 

 pi. loiA, fig. 7, 8, a, b 



We find in the Gaspe material a single ventral valve characterized by 

 its elongate form, broad anteriorly, the absence of median sinus, though the 

 anterior margin is produced medially and there are two low longitudinal 

 depressions which bring the median part into low relief, an effect sometimes 

 shown on immature forms of the species here referred to Plethorhyncha 

 pliopleura; the surface plications are sharp and rather coarse but rapidly 



