42 G. LINDSTRÖM, ()N TIIE SILUUIAN GASTHOrODA AN]) l'TEliOrO])A OF GOTLAND. 



** Ornamental ribs smooth. 



3. C. lasvis n. 



*** Ornamental ribs extreraely narrow and closc with microscopically miniite 

 tubercbles. Two median septa along the faces. 



4. C. ilineata n. 



5. C. aspersa n. 



1. Conularia cancellata Sandberger. 



Pl. I fiff. 1—3. 



Dalman (not Sow.) Vet. Akad. Handl. 374, tab. IV f. 3. 



HisiNGEE Anteckningar hft. 4; 72, 236. • 



Id. Tableau des pétrif., 8. 



Id. » » Ed. 2, 6. 



Id. Lethfea Suecica, 30, pl. X f. 5. 



SowERBY in Mdrciiison Silurian Syst. II, 626, pl. XII f. 22. 



His. Anteckn. VII, 70. 



Morris Catal. Brit. Foss. 168. 



Verneuil in Mcrchis., Vern. & Keyserl. Russia vol. II, 348, pl. 24 fig. 



5 a— b. 

 Morris Catal. Brit. Foss. 2d Ed. 232. 



Salter Appendix to Sedgwicks British Palreozoic Fossils, VI. 

 Pr. Schmidt Untersuch. Silurform. Estlands, 209. 

 Salter Siluria 33 Ed., 550, pl. 25 f. 10. 

 EicHWALD Lethrea rossica vol. I, part II, 1052. 

 Etheridge in Siluria 4:th Ed., 534. 

 Lindström Noraina fossiliura Gotlandiae, 23. 

 Salter Catal. Cambridge Sil. Fossils, 67, 153, 171, 185. 

 Sandberger Neues Jahrb. f. Min. & Geol., 20 (= C. quadrisulcata Sil. Syst.) 

 Bronn Nomenclator, 327. 



Mac Coy in Sedgwicks Brit. Palseoz. Rocks, 287. 

 Etheridge in Siluria 4:th Ed., 534. 

 Heidenhain Graptolithfiilirende Geschiebe der norddeutschen Ebene. Zeitschr. 



d. Deutsch. geol. Ges., 162. 

 Sandberger N. Jahrb., 14 (= C. quadrisulcata Dalman, His.) 

 Bronn Nomenclator, 327. 



Sandberger N. Jahrb., 19 (= C. Sowerbyi Vern. and Morris). 

 Bronn Nomenclator, 327. 

 Barrande Neues Jahrb. f. Min. & Geol., 2. 



Id. Défense des Colon. III, 41. 



Id. Syst. Sil. Boh. III, 48, pl. 5—6. 



Shell conical, quadrilateral, but so much compressed from the sides, that it looks 

 almost bilateral, two of the four faces being on the same side, divided through a deep 

 furrow, which runs exactly along the median line of that side from the aperture to 

 the apex. The two other dividing furrows are situated at the exteriör edges of the 

 shell. A transverse section near the apex is in well preserved specimens rhomboidal, 

 further down towards the apex elliptical or resembling the number 8, being deeply 

 indented along the median axis of the sides by the lateral grooves. The four sides 

 are each, near the aperture, prolonged into a broad tonguelike lobe, through which the 

 aperture is much narrowed, as these four lobes nearly meet and only have a narrow 



Conularia quadrisulcata. 



1824. 



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1828. 



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1829. 



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1831. 



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1837. 



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1839. 



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1840. 



c. Soiverbii. 





1843. 



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1845. 



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1854. 



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1855. 



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1858. 



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1859. 



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1860. 



)> 





1867. 



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1867. 



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1873. 



C. cancellata 





1847. 



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1848. 



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1855. 



B 





1867. 



» 





1869. 



C. curia. 





1847. 



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1848. 



C. erenijugata. 





1847. 



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" 



1848. 



C. proteica 





1854. 



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1865. 



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1867. 



