PLATE 2 0. 



Page 

 Fig. 1. Bacui.ites ovaths, broad variety 394 



I, a. A septum, much magnified. 



1,6. A transverse section of shell of the same variety. 



Fig. 2. Bacumtes ovatus, slightly more compressed variety 394 



2,0. A fragment, consisting of an internal cast, with some remaining portions of the shell. 



[The outline above is intended to illustrate only the form of the margin of the lip 



as seen in a side view, aud does not indicate the entire length of the non-septate 



portion.] 

 '-', 6. A section of same, showing its more narrow-ovate form. 

 2,d. A septum of same, magnified. Its little antisiphonal lobe (on the left) being abnormally 



bifid at the end. 



Fig. 3. Baculites compresscs 400 



3,<i. A septate fragment of a small specimen, side view, with the outline of lip indicated by 

 the line above, which does not, however, show the length of the non-septate body- 

 chamber, for want of room on the plate. 



3, J. A section showing the strongly-compressed form of shells of this size. [See also cuts 

 in text.] 



3, r. A septum of this species, showing the differences from the foregoing species in the form 



of its first lateral lobe aud more pointed character of the subdivisions throughout. 



Fig. 1. Ptyciioceras Mortoni 412 



!../. lb. type-specimen, imperfect at both extremities, natural size. 



4, b. Same, magnified. 



I, & A transverse section, magnified. 



i,d. A magnified view of the siphonal side of the' larger limb. [Too Hat between the rows of 



u odes.] 

 : A magnified diagram ofoue of the septa. 



