G. F. Eaton — Collection of Triassic Fishes at Yale. 267 



micropterus from Connecticut. It is certain, however, that 

 Prof. Newberry's types of S. fultus and S. macropterus, illus- 

 trated in his monograph, are from Boon ton, New Jersey, and 

 that all the specimens in the Redfield Collection which agree 

 with these types are from New Jersey also ; indeed it is possi- 

 ble that S. fultus of Newberry should be rightly considered as 

 limited to that state. 



S. micropterus is known only from Connecticut. 



S. Marsld probably occurs in Massachusetts, Connecticut, 

 and New Jersey. 



S. tenuiceps is a Massachusetts species which is doubtfully 

 from Connecticut. 



S. ovatus (type) is from Boonton, New Jersey. 



The other species of Semionotus described by Prof. Newberry 

 in his monograph must remain of doubtful validity until their 

 claims for distinction are better supported. Indeed the diffi- 

 culty of the situation cannot be better shown than by quoting 

 Dr. Woodward's sweeping statement : " Nearly complete fishes, 

 variously crushed and distorted and sometimes imperfectly 

 preserved, have been described from the Trias of North America 

 under the following names. They may be conveniently referred 

 to the genus Semionotits, and doubtless represent much fewer 

 species than are here enumerated. " Then follows a list of all 

 the American species except S. fultus and S. tenuiceps. It is 

 the present writer's hope that these notes may serve to reestablish 

 three of the species thus lately discredited, and may place the 

 classification of this genus on a firmer basis. 



Catopterus J. H. Redfield. 



This genus is represented in the Yale Collection by J. H. 

 Reclfield's type of C. gracilis and by a remarkably good series 

 of specimens from the Trias of New Jersey and of the old 

 Connecticut River valley, which probably belong under the 

 type species, as they agree in the main with the characters of 

 that species given by Dr. Woodward. The only addition to 

 the knowledge of the structure of this genus is the determi- 

 nation that the flank scales were interlocked by a single peg- 

 and-socket articulation. From the superior margins of these 

 scales arise pegs similar to those which characterize the supe- 

 rior margins of the flank scales of Semionotits ; but no articu- 

 lating processes have been found projecting from the antero- 

 inferior angles. As flank scales can be seen in the closely 

 allied genus Dictyopjyge, which articulate in a like manner, it 

 is evident that the single peg-and-socket articulation is charac- 

 teristic of the Catopteridse. 



Yale University, February 24, 1903. 



