REPORT OF THE STATE PALEONTOLOGIST 1902 917 



tinct and swing forward to make a wide, shallow lateral saddle, 

 then back, making a shallow lobe, and forward again, making 

 a narrow ventral saddle. The two ends of the suture line do 

 not meet, as the siphuncle intervenes. This variety has the 

 suture line of T. uniangulare, but differs in the open 

 umbilicus. It is also thicker in proportions. These are points 

 possessed by a young T. uniangulare; but at the stage 

 when the normal young has such a form, it has a much simpler 

 suture line. This variety occurs most abundantly in all 

 localities. 



A second variety is the more gibbous form, called by Clarke 

 G. a s t a r t e . Its suture line has only a single lateral lobe 

 and a shallow ventral saddle. There are usually two and one 

 half whorls. The thickness is to the breadth as 1 is to 2. These 

 seem to be young forms of the above. 



The third variety is well marked off, in that it has a strong 

 constriction on the outer whorl, a character which is seldom 

 seen on the American Devonic Goniatites. 



All these forms occur at Oanandaigua lake, Livonia salt shaft, 

 Greigsville and Moscow, both at Little Beard's creek and near 

 the Delaware, Lackawanna and Western Railroad. Total num- 

 ber of specimens 131. 



CRUSTACEA 



Genus cryphaeus Green 



Cryphaeus boothi var. calliteles Green 



Plate 5, fig. 15 



Trilobite remains are extremely rare in the pyrite, two frag- 

 ments representing all the individuals. The larger fragment 

 includes a glabellum and the first body segments. This is a 

 small individual, agreeing in every way with 0. calliteles; 

 showing even the nodes along the axial line of the body. The 

 second fragment is an isolated eye of Dalmanites. They were 

 found at Little Beard's creek near Moscow and appear to be 

 parts of a stray trilobite which wandered into the pyrite area 

 to die. 



Inasmuch as the Ostracoda from the Hamilton have not 

 been described, I have given those found specific names, as thej 

 are the representatives of an otherwise unknown fauna. 



