The Invertebrate Fauna of the UitenJiage Series. 181 



suture-lines are so complex, the agreement, in fact, is remarkably 

 close. Phylloceras picturatum has somewhat less inflated whorls 

 than the African form, and its surface is said to be entirely smooth. 



In the depth of the siphonal and first lateral lobes of the septal 

 suture, there is agreement with Phylloceras semisulcatum (d'Orb.)* 

 but the suture of that form is much less complex in its details. 



There is considerable similarity of form to a specimen from the 

 Wernsdorfer Schichten (Barremian of Silesia) described by Uhlig 

 under the name Phylloceras cf. guettardi Kasp.f The whorl-section 

 of this shows that the flanks converge slightly towards the periphery, 

 which is narrowly arched. In the African specimen the flanks are 

 not so markedly convergent, but are more nearly parallel, and they 

 are perhaps a little less convex. The peripheral area is broader, and 

 in the cross-section of the whorl a greater breadth is maintained up 

 to the peripheral part. There are no noteworthy points of agree- 

 ment in the course of the septal suture of these two forms. In the 

 shell described by Uhlig, which is said to have a suture identical 

 with that figured by d'Orbigny for Phylloceras guettardi,\ the 

 siphonal and first lateral lobes are of unequal length, and the suture 

 is considerably less complex in its details. 



The specimen here described appears to represent a new species, 

 but it will be necessary at some future time to supplement the 

 present imperfect account by additional notes, and by the illustra- 

 tion of the septal suture of a more favourably preserved individual. 



GENUS BOCHIANITES P. Lory. 



BOCHIANITES GLABER Sp. nOV. 



Plate VIII., figs. 20, 21. 



Description. The shell has a delicately attenuated form, and 

 increases very slowly in diameter. Near the delicately pointed 

 posterior end the shell is cylindrical, but becomes slightly com- 

 pressed laterally, with corresponding elliptical section, when traced 

 towards the anterior end. The surface is devoid of ornamentation, 

 and is marked by numerous minute lines of growth which show 

 a slight anterior arching on the siphonal side, and when traced 

 across the flank of the shell are directed somewhat posteriorly ; they 

 follow a straight course (or have an exceedingly gentle and broad 



* d'Orbigny (1), pi. liii., fig. 6 (1841). 

 f Uhlig (1), p. 182, Taf. iv., fig. 9. 

 J d'Orbigny (1), pi. liii., fig. 3 (1841). 

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