EXPLANATION OF PLATE XL. 



Crioceras flindkrsi, McCoy, sp. 



. 1. Lateral view of a partly testiferous coil and a portion of the shaft 

 or limb, with both simple, bifurcate and fasciculate sigmoidal 



COSt, 'i . 



,, 2. Ventral view of the limb portion of Fig. 1. The costas crossing 

 the venter are eithei single or double he t ween the in bricks marking 



the positions of the abdominal angli 



,, .'>. Lateral view of portion of a natural whorl cast in which the fasci- 

 culation of the cost® is excellentlj shown. 



,, 4. Ventral view of Fig. 3. Here the costae crossing the venter are, 

 some single and ethers treble between the tubercles, which have 

 assumed a more ni outline than in other similai specimi as. 



,, 5. Lateral view of a natural limb or shall cast with fasciculate and 

 bifurcate curved costse and the characteristic longitudinally 

 elongated tubercles. 



,, G. Ventral view of Fig .">. The venter is narrower than usual, with 

 three and even four costte crossing it between the two rows of 

 tubercles. 



