SUPPLEMENT.— DARE LLI A. cxiii 



Definition. — Platy-subleptogyral, 1 subangustumbilicate (subdensiseptate, sub- 

 brevi-subangustilobate) 2 ; laterally arciracliate ; peripherally sublatanguliradiate, 

 tabulate, distincticarinate. (Radial line, Fig. 73, p. clxv.) 



Distinction. — From Lopadoceras, which has a similar biarcuate radial line — costate 

 stage is coarser, but less persistent, decline to levigate stage being rapid ; build of 

 whorls rather stouter, carina less distinct. 



1. Dakellia skmicostata, 8. Buckman. Plate XII, figs. 10, 11; Suppl., Plate 



XVIII, fig. 30. 



1888. LlOCEEAS DECIPIENS, VCLT. INTERMEDIUM, This MoilOgT., PL xii, figS. 10, 11. 



1898. Darellia semicostata, 8. Buckman, ' Jurassic Time ' ; Quart. Journ. Geol. 



Soc, vol. liv, p. 459. 



Description. — Costati-gradumbilicate, parvicostate to levigate. 

 Note. — The carina becomes less prominent after about 55 mm. diameter. 

 Localities <m<l Strata. — Dorset: Bradford Abbas, Fossil Bed; Somerset: 

 Dundry, Limestone and Marl Beds (E. Wilson). 

 Date of Existence. — Discitse hemera, presumably. 



2. Dakellia l^vis, 8. Buckman. Plate XVIII, figs. 4, 5 ; Suppl., Fig. 74, p. clxv, 



Fig. 75 in text. 



1889. Hyperlioceras discttes, This Mouogr., PL xviii, figs. 4, 5 only. 

 1902. Darellia l^vis, Emend. Amm. Nom., p. 3. 



Description. — Subgradumbilicate ; obsoleticostate to levigate. 



Note. — There are costse in the umbilicus, indicating a costate stage in 

 youth. 



lie marl's. — Radial line and general details agree with D. semi- ), 



costatn, but the thickness is actually greater; so that, proportionately (s£[\l_-_( 

 to umbilication it is much more. This would throw doubt on its 

 being an angustumbilicate derivative from D. semicostata, im e of' Dareiila 



Locality and Stratum. — Dorset : Bradford Abbas, Fossil Bed. 



Date of Existence. — Discitse hemera, presumably. 



3. Dakellia toxeres, 8. Buckman. Suppl., Plate XVIIT, figs. 13 — 15. 



Description. — Angustumbilicate, levigate. 

 Distinction, — From D. semicostata, smaller umbilicus. 



1 Almost leptogyral. - Seen obscurely through test of D. semicostata. 



1' 



