cxxx INFERIOR OOLITE AMMONITES. 



Localities and Strata. — Gloucestershire: near Stroud, Buckholt Wood; near 

 Dursley, Coaley Wood; nodules in the striatulus beds. 



Date of Existence. — Variabilis hemera, properly — the nodules being remanie in 

 the Striatulus beds. 



Cypholioceeas plicatum ? Plate XIV, figs. 5, 6. (See p. xlv.) 



1888. Liocekas opalinum, var. comptum, This Moiiogr., PL xiv, figs. 5, 6. 



The radial line (fig. 102, p. clxv) of this specimen, however, is less curved 

 laterally and less projected peripherally than in the type, perhaps due to youth. 



Hyattixa ? sp. PI. IV, fig. 7 ; Suppl, PI. XVII, fig. 29. (See p. lvii.) 



1887. Lioceeas beadfoedense, This Monogr., PI. iv, fig. 7. 



Description. — The periphery is subtabulate, the carina is subdistinct, subacute. 

 Suture-lines : Subdensiseptate, sublongi-angustilobate. 



Note. — The radial line (Suppl., PI. XVII, fig. 29) is drawn with rather too much 

 lateral curve : the bend should not be quite so close to the guide line. 



Remarks. — Nearest to Hyattina Brasili, agrees fairly in suture line — perhaps a 

 trifle more longilobate — in periphery — in carina, H. Brasili having no test, in 

 proportions ; differs in ornament, the ribs being closer together, and not so 

 coarse. 



Beasilina Tutcheei? Suppl., PI. X, figs. 35 — 37. (See p. lxxxiii.) 



lie hi ark*. — The specimen referred to looks like a young example of B. Tutcheri, 

 but it seems to be too compressed and too carinate. 



Gammieadiate. 



Quite a distinct series of Ammonites of the family Hildoceratidae has now to 

 be dealt with ; they were formerly classed as Grammoceras. Their radial line in 

 the main suggests a Greek T ; and the suture line is simple. Other characters are 

 well-marked ribs and latumbilication ; but normal decline affects these features 

 to produce small ribs, or none at all, and angustumbilication. Before 

 degeneration sets in the species have much likeness to Lillia (p. xiii), but with this 

 important distinction : the earliest species (see below, Grammoceras) have costas 

 with knobs on the peripheral edge; in Lillia the knobs are on the umbilical 

 border. However, in an allied genus, Chart ran ia (p. xvi), there are two rows of 

 nodi. Possibly, then, Lillia, Chartronia, Grammoceras, with their respective allies 

 and descendants, have a common origin in a binodate ancestor. 



