No. l8.] TRIASSIC FISHES OF CONNECTICUT. 53 



still incomplete, and, owing to deficiency of reliable material, 

 the time has not yet come when a thoroughly satisfactory and 

 authentic restoration can be given of the head. For the present,, 

 however, we may content ourselves with calling attention to the 

 general Palaeoniscid-like arrangement of the cranial plates, as 

 far as the details have been worked out; and, in default of a 

 tentative figure showing these parts, we may refer the reader to 

 the different types portrayed in Fig. 7 on page 59, with special 

 emphasis upon the approach made by Catopterus to the early 

 and more primitive models. 



A few words may be said in regard to the second of New- 

 berry's drawings, which has this in common with the first, and 

 indeed with all pioneer studies ; that, however we may judge 

 of its accuracy, it is at least an interesting historical document, 

 and has a certain intrinsic value in so far as it acquaints us with 

 a graphic presentation of the author's views at the stage he had 

 then attained in his investigations. In Fig. 6 is represented 

 Professor Newberry's idea of the structure of the under side of 

 the head. A comparison of his drawing with the original speci- 

 men (Cat. No. 635 G) shows that the head is much distorted, 

 the clavicle and infraclavicle being displaced far forwards, and 

 thereby producing a very deceptive appearance. It may be stated 

 positively that no median jugular plate is present, nor is any 

 trace to be seen of the branchiostegal apparatus. The space 

 included within the angle formed by the mandibular rami ap- 

 pears to have been covered in part by rhombic ganoid scales, 

 in part by indurated skin ornamented, with papillae, but not oc- 

 cupied by distinct plates. Both of Newberry's originals were 

 obtained from near Durham, Connecticut. 



By way of summarizing the few definitely known facts that 

 have been gleaned from a comparison of very numerous cranial 

 fragments belonging to this species, the following points may 

 be noted: The head is in general Palseoniscid-like. There is a 

 pair of small parietals behind, in front of which are placed the 

 narrow and elongate frontals, traversed longitudinally by sensory 

 canals; and these are succeeded in turn by a median ethmoid of 

 the form shown in Newberry's drawing (Fig. 5, e). This median 

 system of plates is bounded on either side by three pairs of 

 lateral plates which may be designated as the squamosal, post- 

 frontal, and prefrontal. There is no circumorbital ring, and the 



