﻿COSTATiE. 147 



The name is intended as a slight record of my extensive obhgations to Mr. 

 Cunnington in the loan Trigonics of from various formations, but more especially from 

 the Cretaceous Rocks of Wiltshire ; the number of specimens figured affords no criterion 

 of the advantages derived from the comparisons of the very numerous forms placed at my 

 disposal ; these included every example of the genus contained in a collection very 

 extensive and peculiarly local. 



% VII. COSTAT^. 



Trigonia costata, Sow. Plate XXIX, figs. 5, 6, 7, 8, 9, 10. 



TuiGONiA COSTATA, Sowerhy . Mineral Conchology, vol. i, tab. 85, p. 195, 1815. 

 Lyrodon costatum, Goldfuss. Petrefacta Germanise, tab. 137, fig. 3 a, b, 1836. 

 Trigonia costata, Agassis. Trigonies, pi. 3, fig. 11, 1840. 



— LiNEOLATA, Ibid. Ibid., pi. 4, fig. 1-5, 1840 (young example). 



— COSTATA, Beshayes. Traite elementaire de Conch., pi. 32, figs. 12-14, 1849. 



— — Quenstedi. Der Jura, tab. 60, figs. 10-12; also wood-engraving, 



p. 502, 1857. 



Exclude the following figures of Trigonia attributed to T. costata : 



Knorr, Versteinerungen, Supplement, tab. 5 c, fig. 3, 4, 1772. 



Parkinson, Organic Remains, vol. 3, pi. 12, fig. 4, 1811. 



Smith, Strata Identified, Cornbrash, fig. 4, 1819. 



Young and Bird, Geol. Survey, pi. 8, fig. 19, 1828. 



Sowerby, in Grant's Memoir on the Geology of Cutch, Geol. Trans., 2nd ser., vol. 5, 



pi. 21, fig. 17, 1836. 

 Ziethen, Petrefacta Wurtemb., tab. 137, fig. 3 a, b, 1838. 

 Bronn, Lethsea Geognostica, tab. 20, fig. 4, 1837-8. 

 Deshayes, Encyclop. Method., Supplement, pi. 238, fig. 1 a, b, 1836-8. 

 Dewalque et Chapuis, Paleont. Luxemb., pi. 25, fig. 8, 1855. 

 Pusch, Polens Palaeont., tab. 7, figs. 1, 2, 1837. 



Goldfuss, var. triangularis, Petrefacta Germanise, tab. 137, fig. 3 d, 1836-9. 

 lb., ib., tab. 137, fig. 3 c, 1836-9. 

 Quenstedt, Der Jura, tab. 67, fig. 13, 1857. 

 Ib., tab. 45, fig. 15, 1857. 



The foregoing list of authorities excludes descriptions which are not accompanied by figures. 



In Britain T. costata comprehends two varieties, both of which occur together in the 

 Inferior Oolite in its course through the Southern and Midland Counties of England. 



