VOL. XV. (3) BUCKMAN—LIAS AMMONITES 243 
along the middle of periphery, becoming more noticeable 
at the end of the whorl, indicates an incipient furrow. 
Remarks :—Two small specimens are very distinct from 
any other Schlotheimia; but the peripheral depression 
indicative of a nascent furrow shews their connection. 
The specimens are presumably the immature form of 
a Schlotheimia, which however, did not grow much larger, 
perhaps. They shew what Hyatt calls persistence of the 
larval form. There is retardation in the development of 
the ribs, instead of acceleration of earlier inheritance, or 
tachygensis. So the almost smooth stage persists till the 
furrow commences, whereas in normal cases the cost 
should develop before the furrow, as may be seen to be 
the case in Wahneroceras, and in other species of Schdot- 
heimia ; and this agrees with the phylogeny of the group. 
Locality .—From Gloucester Gas Works, ( Oxynott- 
armati hemere), Coll. of Mr L. Richardson. 
23. SCHLOTHEIMIA GLEVENSIS, sp. nov., PIPQtE: 
EES 52. 
Description :—Compressed, whorls half included ; sub- 
flexi. and connati-costate; peripheral sulcus gradually 
becoming more distinct. 
Remarks :—In degree of costation and stoutness of 
whorls similar to S. cheltonzenszs, but whorls not so 
broad, and umbilicus larger. In these respects more like 
S. Jacunata, but much more strongly costate. From S. 
subdeleta, more flexed, coarser costz, and other features. 
The /arvalis stage may be seen in the inner whorls. One 
specimen is between davvadzs and glevensts, the ribs earlier 
than in the former but later than in the latter. 
Locality :—“ Gloucester Gas Works, (oxynott-armati 
hemere)” (Mr L. Richardson). 
