SUPPLEMENT.— DENCKMANNIA. 



xxi 



5. Denckmannia ? aspsea, 8. Buchman. 



1874. Ammonites malagma, Dumortier, iv, PI. xxii, figs. 2 — 4 only. 



1882. Harfoceras variabile, Wright, PL lxviii. 



1890. Haitgia variabilis, var. a, This Monograph, p. 147 (pars). 



Description. — Platygyral, sublatumbilicate, irregulari-crassornate, bullate, 

 subrursi-recticostate tending to flexicostate, subalti-septicarinate. 



Distinction. — From variabilis, by coarser, more irregular ornamentation. In 

 the points where it differs from variabilis it most resembles malagma, fig. 1, but 

 that is still more coarsely ornate. Dumortier also shows another less coarsely 

 ornate fossil as malagma (figs. 2—4), which appears to belong to the present 

 species. It is certainly different from his fig. 1, to which the name malagma 

 must be restricted. 



Remarks. — A very fine side view is shown by Wright, but not a front view. 



Localities and Strata. — Gloucestershire : Nailsworth, Wright's specimen (evi- 

 dently from the Cotteswold sands) ; Somerset : Shepton Beauchamp (" Upper 

 Lias"). 



Date of Existence. — Variabilis hemera. 



6. Denckmannia? obtecta, 8. Buchman. Suppl., Plate IV, figs. 4 — 6. 

 1890. Haugia variabilis, var. a, This Monograph, p. 147 (pars). 



Description. — Platyleptogyral, angustumbilicate, subparvi - subrursi - subflexi- 

 costati-bullate, subalti-septicarinate. 



Remarks. — The bulla? fail at a diameter of about 80 mm. ; the costs? become 

 irregular and obsolete at about 120 mm. ; after that the test is smooth except for 

 some obscure undulations. 



Where the bulla? are most prominently developed, the occlusion by the 

 succeeding whorl reaches nearly up to the bulla? themselves, so that there is no 

 costate space between them and the inner edge of the next whorl. Afterwards 

 a costate space appears, partly because the bullae decline in size, partly because 

 the inner margin recedes. 



Distinction. — From aspera, less umbilicate and less coarsely costate ; from 

 variabilis, the earlier failure of tubercles, the less coarse costa?, the want of a 

 regular costate space between bulla? and inner edge of succeeding whorl, greater 

 irregularity of ornament. 



