44 Annals of the Carnegie Museum. 



and Boeck^ of Norway and to 5. sicardi (Bergeron) of southern France. 

 A figure of the latter species, drawn from a specimen in the Carnegie 

 Museum, is introduced for comparison. The dorsal furrows are more 

 prominent on the cephalon of the European species, but otherwise they 

 are very much alike. 



Through the kindness of Mr. Henry B. Kummel, State Geologist of 

 New Jersey, the writer has been able to study the fine cranidium figured 

 by Dr. Weller, and to compae it with material from Fort Hunter The 

 specimens from the two localities are alike in all particulars except size, 

 and the specimen from New Jersey shows the small median tubercle 

 between the eyes described by Cleland in specimens from New York. 



lUcBnurus eurekensis Walcott from the lower portion of the Pogonip 

 group^ should also be referred to Symphysurus, as Brogger has already 

 suggested. 



Illcenurus convexus Whitfield* has a pygidium much more like that of 

 the typical Illcenurus than either of the above species. The pygidium is 

 described by Whitfield as being twice as broad as long and the dorsal 

 furrows indicated only by slight constrictions on the anterior margin. 

 This is probably a true Illcenurus, though the cranidum is more like that 

 of the species here discussed than it is like that of IVcsnurus quadratus. 



Asaphus illcenoides BiWings (Paleozoic Fossils of Canada, Vol. I, p. 414) 

 is another American species of Symphysurus. 



All specimens with the exception of the originals of figs. 5, 6, and 14 

 are in the Carnegie Museum. 



Explanation of Plate XIV. 



1. Isoteloides whitfieldi Raymond. A small specimen from the Beekmantown 

 at Crown Point, New York. Natural size. This figure does not show the flattened 

 anterior margin as well as figure 2. Natural size. 



2. The same specimen. A little less than natural size. 



3. The same species. A pygidium from Fort Cassin, Vermont. 



4. The same species. An hypostoma from Ft. Ticonderoga, New York. 

 Natural size. 



5. Asaphellus gyracanthus Raymond. An imperfect cranidium from Fort 

 Hunter, New York. Natural size. Specimen in the Cornell University Museum. 



6. The same species. A free cheek from the same locality and same collection 

 as the last. Natural size. 



7. The same species. A pygidium from Fort Hunter in the Carnegie Museum. 

 Natural size. 



^Brogger. "Die Silurischen Etagen 2 und 3," 1882, 60, pi. 3, figs. 9-1 1 

 ^Paleontology of the Eureka District, 97, pi. 12, figs, 4. 4a. 

 ^Geology Wisconsin, IV, 203. pi. 4. figs 3-5 



