23O NEW YORK STATE MUSEUM 



The hinge is well displayed in some specimens and is peculiar 

 for its simplicity; there is a moderately broad striated ligament 

 area which widens slightly beneath the beaks but there is, under 

 the most favorable preservation, no evidence whatever of the 

 umbonal teeth which exist in the typical forms of Goniophora. 

 Therefore the suggestion of relationship to that genus is wholly 

 based on the general aspect of the exterior. The shell is generally 

 about twice as long as high and many attain a length of 50 mm. 

 Surface sculpture simple concentric lines. Beushausen referred 

 to Cardiomorpha such toothless shells, including within, his diag- 

 nosis a large variety of external expressions, among others forms 

 having this Goniophoralike exterior [see especially C. a 1 a t a 

 Sandb. in op. cit. p. 223, pi. 25, fig. 15-17]. 



Lozver Devonic. Mooseheadlake, north of Soccatean point, Me. 



Palaeoneilo mainensis no v. 



Shell attaining large dimensions for a species of the genus, 

 subtrihedral, depressed convex, with beak but little in front of 

 middle of the hinge. Hight three fifths of the length. Posterior 

 surface gently sinuate and the postlateral shell margins corres- 



Palaeoneilo mainensis 



pondingly emarginate, extremities narrow. Surface covered with 

 fine concentric growth lines. On the interior the muscle scars are 

 deeply inpressed, there being on the umbonal side of each a ridge 

 but both anterior scar and ridge are very much the more strongly 

 marked and almost attain the strength of the ridge in Nuculites. 



