76 ^".s- P- Focrste 



about 10 or 11 in a width of 5 mm. Between these more promi- 

 nent striae, single, very line striae may be seen with a lens. These 

 longitudinal striae are crossed by very much finer but very distinct 

 transverse striae, about 11 in a length of one millimeter. 



In Orthoccras bilineatinn, the longitudinal striae appear to be 

 much more distant. In Orthoceras clathratnm, the intermediate 

 striae are absent, although the very fine transverse striae are dis- 

 tinct. 



Orthoceras (Loxoceras) milleri, sp. nov. 



(Plate I, fig. 5; Plate II. figs. 24 A, B.) 



Orthoceracone v\ath circular section, and having a small rate 

 of growth, about 7 mm. in a length of 80 mm. in the larger speci- 

 men at hand. This specimen, 80 mm. long, has a wddth of 38 mm. 

 at the top and 31 mm. at the base. The cameras are shallow, 5 

 occupying a length of 15 mm. near the smaller end of this speci- 

 men. The concavity of the septa equals the depth of two and a 

 half cameras. The siphuncle is strongly nummuloidal. At the 

 larger end of the specimen its width at the septum is 7 mm., at the 

 smaller end its width is 6 mm. Within the cameras the width 

 enlarges considerably, equalling 9 mm. at the smaller end. The 

 inner walls of the nummuloidal segments of the siphuncle are lined 

 with a heavy deposit of calcareous material, leaving a narrow cen- 

 tral opening at the septa, but there is no evidence of a radiate 

 structure, as in Actinoceras. Similar calcareous deposits line the 

 interior of the cameras. The exterior of the casts of these cameras 

 is marked on one side by faint longitudinal lines, of which there 

 are no trace on the exterior surface of the small fragments of the 

 thin test of the phragmocone remaining locally attached to the casts 

 of the interiors of the cameras. 



Several specimens of this species were found in the Perryville 

 bed, about 2 miles south of the Crow distillery, east of the road, 

 near the home of Allen McGarvey, on the farm owned by Mrs. 

 Ben Williams. The locality is one mile southeast of McKee ferry, 

 in Woodford county, Kentucky, about 7 miles south of Frankfort. 

 I desire to name this species in honor of Prof. Arthur M. Miller, 

 of Kentucky State University, who has given much attention to 

 the Ordovician rocks of Kentucky, and to wdiom I am much in- 

 debted for information regarding the same. 



