1897.] NEW PALEOZOIC VERTEBRATA. 79 



belong, were it not for the fact that he states in his description that 

 the S. rcticidatus is characterized by the elongated form. '' This is 

 best shown," he says, 'Mn some of the smaller specimens, which 

 are more than twice as long as broad, and spatulate in outline." 

 The two scales represented in Figs. 13, 14, belong probably to my 

 S. quinamciatus ; No. 13 is, however, larger than any scale of it 

 which I have seen. 



Sagenodus conchiolepis, sp. nov. PI. I, Fig. 4. 



Two scales of peculiar form represent this large species. They 



are parallelogrammic in outline, the extremities being about equally 



wide and equally moderately convex. There are two features of 



the sculpture which are conspicuous ; first, the presence of minute 



striae, both radiating and concentric, and second, the extension of 



the tessellate area to the edge of the scale, without border of striae 



only as in the last species. The ^. conchiolepis differs also from 



the S. reticulatus in that the terminal boundaries of the area, are 



also concentric, giving a characteristic appearance. The sculpture, 



as in the S. reticulatus, radiates from near the proximal end, which 



is not marked by radii. 



Measurements. mm. 



■r>,. ^ T^T (vertical at middle 20 



Diameters No. i - . 



(longitudinal 42 



Tesserae, width 5 to 1.5 



T^- X AT ( vertical i -^ 



Diameters No. 2 - ^ 



(longitudinal 29 



Type F. 15, 16; Cotype F. 17, 18; Lacoe collection. 



Sagenodus lacovianus, sp. nov. PI. I, Fig. 5. 



A well-preserved scale indicates another species larger than the 

 S. conchiolepis, and one which resembles more the .S". reticulatus. 

 The scale is an elongate oval with strongly convex extremities. 

 Although one edge is damaged enough remains to show its parallel- 

 ism to the opposite edge. The sculpture is also peculiar. The usual 

 fine radiating lines are present, but there are no concentric lines, 

 either fine or coarse, excepting a coarse one which is one- sixth the 

 length from the distal border, and runs quite close to the long 

 border. The areas are confined to a central tract, which extends 

 from the proximal border over two-fifths the length from it. The 

 space between the concentric ridge and the lateral borders is also 



