82 ANNUAL REPORT OF 



There are preserved in the American Museum of Natural His- 

 tory in New York three very excellent specimens of Semionotus, 

 from Sunderland, Mass., which were presented to that institution 

 a number of years ago by Mr. Robert L. Stuart, and are referred 

 to by Newberry in his Monograph under the caption of Ischyp- 

 terus marshi. One of them he mentions as "an exceptionally per- 

 fect specimen about twelve inches long," this being probably the 

 identical individual which is shown in Plate VII. of this report, 

 and forms the basis of our restoration in Plate I. Another of the 

 trio is represented in Plate VIII., this one having the pectoral fin 

 and dorsal ridge-scales very well preserved. After the completion 

 of his Monograph, these specimens were again examined by Pro- 

 fessor Newberry, and according to the veteran curator, Professor 

 Whitfield, were redetermined by him as belonging to S. agassizii r 

 this name being thereupon inscribed upon the labels. These speci- 

 mens, which may be regarded upon Newberry's authority as be- 

 longing undoubtedly to 5. agassizii, have more recently been in- 

 vestigated by Dr. G. F. Eaton, of Yale University, and his opinion 

 is that no differences are to be observed between them and the 

 type of >S\ marshi, which is preserved in the Yale Museum. Dr. 

 Eaton's view that the species is "probably common to Massachu- 

 setts, Connecticut and New Jersey" is in accord with the original 

 statement of Redfield. 



The illustration given in Plate III., fig. I, for the use of which 

 we are indebted to Dr. Eaton, shows the head of the type-speci- 

 men of the so-called S. marshi, which is poorly represented in 

 Newberry's figure. The tail, too, in the same illustration, has been 

 largely restored without the fact being so indicated. Certain de- 

 tached scales from different parts of the body are likewise repro- 

 duced from Dr. Eaton's article in the American Journal of 

 Science. Plate I. of the present report having been drawn from 

 an actual photograph, it has been thought advisable to leave the 

 squamation, including the dorsal ridge-scales, and also the fin- 

 rays, exactly as they occur in the original specimen, without at- 

 tempting a restoration. 



