BELEMNITES OF THE LIAS. 



67 



Belemnites junceus, n. s. PI. XIII, fig. 33. 



Guard. Excessively elongated, slender, nearly of equal diameter for a great length, 

 expanded anteriorly, compressed, with shallow lateral risings and hollows extending 

 along the whole length of the surface. 



Sections of the sheath show the sparry lamellae nearly circular toward the axis, but 

 very elliptical toward the circumference. The apicial line is nearly central. The fibres 

 are coloured in light and dark bands. (The summit is miknown; the compression 

 increases toward the summit.) 



Phragmocone. Unknown. 



Dimensions. Total length of a fragment, above 3' 5 inches; greatest diameter, 0'33 ; 

 axis of guard, above 3*0. 



Proportions of the guard, the diameter a d at the apex of the alveolus being 

 100, the ventral radius is 48, dorsal radius 5 52, cross diameter 75 to 85, axis of guard 

 above 1500. 



Locality. Golden Cliff", near Lyme Regis. The author possesses portions of two 

 guards, including the alveolar and parts of the apicial regions. 



Belemnites nitidus, n. s. PI. XIII, fig. 34. 



Guard. Remarkably elongated, compressed, for a great portion of its length of 

 equal diameter, but acutely conical toward the summit, which is pointed; expanded 

 anteriorly ; smooth, with two very slight dorso-lateral grooves near the smnmit, and a 

 double lateral furrow extending over nearly all the apicial region. 



Sections show the apicial line nearly central, straight, surrounded by subelliptical 

 lameUse, finely fibrous, the outer ones acquiring double lateral flutings. 



Phragmocone. Unknown. 



Dimensions. Total length, 7'5 inches (8"0) ; greatest diameter, 1*0; axis of guard, 

 5-5 ; alveolar axis, probably 2*5. 



Proportions of the sheath, the diameter « 3 at the apex of the alveolus being 100, 

 the ventral radius is 46, dorsal radius 54, cross diameter 80, axis 1000. 



Locality. Belemnite-bed, Golden Cliff", Lyme Regis {Oxford Museum, Phillips s 

 Cabinet). Banbury, Lower Lias {Stuttard, No. 135). 



