CErHALOPODA FROM THE CROSS FELL INLIER. 



527 



scarcely (5 lines apart, the diameter here having increased to about 

 2 inches. Two sections have been made, the one transverse, the 

 other longitudinal, but without disclosing any trace of the siphuncle, 

 Avhich must have been contained in the part removed by weathering ; 

 if so, it could not have been far from the margin. No trace of the 

 test exists. 



Memarls. The general features of this fossil recall those of 

 Ortlioceras ludense, J. de C. Sow. (^0. columnare, Boll, 0. tem- 

 iH'vann^ Barr.), from the Upper Silurian rocks of Britain, Sweden, 

 Bohemia, &c., and in its distant septa it is also comparable with 

 Orihoceras omissum, Blake*. Both 0. ludense and 0. omissum, 

 liowever, are found upon a much higher horizon than the present 

 fossil. 



.S. Orthoceras pusgillense, sp. nov. 



Description. Several fragments of the septate part of a species 

 with a bulbous siphuncle were collected in the Coronw-beds at 



Ortlioceras pusgUlense. 



a, cast, showing septa ; h, base of septum with siphuncle ; c, polished section ; 

 d, polished section, showing siphuncle pushed out of position. 



Pusgill. The shell is cj'lindrical when uncompressed, and tapers 

 somewhat rapidly, that is, at the rate of about 1 in 7|, in a 

 fragment 2 inches in length. The septa are very numerous, being 

 about Ig lines distant from each other where the diameter of the 

 shell is 11 lines ; they are shallow, and are pierced by a nearly 

 central siphuncle, having beaded segments which have a width 

 equalling nearly one-fourth the diameter of the shell. The test 

 is quite smooth. Some of the specimens have been crushed laterally 



* 'British Fossil Cephalopoda,' pt. i. (1882) p. 160, pi. xv. figs. 9, 9a. 



