?6 NEW YORK STATE MUSEUM 



observed a Leperditia in the Salina beds, and wormtubes and tracks 

 are seen on the other side of the slab with C. salinensis. 

 These are the only signs of organic life in the Salina beds of which 

 I am aware, and even this little life seems out of place considering 

 the conditions indicated by the repetition of salt and gypsum beds, 

 hopper-crystals etc. Still, even today organic life in the shape of 

 a few small pelecypods persists in the chain of " shotts," lakes in 

 the south of Tunis and Algiers, some of which are so intensely 

 saline that caravans pass over the salt crusts covering them. 



The species here described is, from its general outline, probably 

 a Ctenodonta and similar to representatives of that genus in the 

 preceding Niagaran group and the later Cobleskill limestone. 



Orthoceras vicinus nov. 

 Plate 25, figure 10 



Description. Slender orthoceracone of medium to large size ; 

 rate of expansion 10 mm in 130 mm of length. Septa closely 

 arranged, four in 10 mm, where the conch is about 20 mm wide. 

 Camerae shallow, nine times as wide as deep. Living chamber 

 long. Aperture not observed. Siphuncle small, centren, segments 

 cylindrical, apparently empty. Surface sculpture not known. 



Horizon and locality. Bertie waterlime, 5 feet above gypsum in 

 Sweet Plaster quarry at Marcellus, N. Y. 



Remarks. This simple Orthoceras is mainly interesting on 

 account of its occurrence in the Bertie waterlime in association 

 with the eurypterids. From this it derives its name. The slow 

 rate of growth, suggested by the slender form and very shallow 

 camerae, is perhaps an indication of little favorable conditions for 

 the growth of these typically marine creatures. The close arrange- 

 ment of the septa is the most striking feature of the species. 



Gomphoceras osculum nov. 



Plate 27, figures 10 and 11 



Description. Small cyrtoceracone, of slight curvature, but 

 very rapid expansion, the greatest width of the living chamber 

 (15.5 mm) being almost one-half of the length of the conch (28 

 mm).' Section oval, contracting slightly more toward the inner 

 (ventral) side; major axis about twice as long as minor. Living 

 chamber nearly half the size of the conch (16 mm), about as wide 

 (at the aperture) as long, strongly convex on exterior side, slightly 



