42 G. LINDSTROM, ON TlIK SILUKIAN (iASTHOPODA AND I'TEHOPODA OF OOTLANl). 



** Ornamental ribs smooth. 



3. C. lajvis n. 



*** Ornamental ribs extremely narroAv and close with microscopically minute 

 tiibercbles. Two median septa along the faces. 



4. C. ilineata n. 



5. C. aspersa n. 



1. Conularia cancellata Sandberoer. 



PI. I fig. 1—3. 



Dalman (not Sow.) Vet. Akad. Ilandl. 374, lal). IV 1". 3. 



HisiNGER Atitecknirigar hft. 4; 72, 230. 



Id. Tableau dcs pctrif., 8. 



Id. » » Ed. 2, 6. 



Id. Lctliaja Suecica, 30, pi. X f. 5. 



SovvERBY in MuRCiiisoN Silurian Syst. II, G26, pi. XII f. 22. 



His. Anteckn. VII, 70. 



Morris Catal. Brit. Foss. 168. 



VisRNEUiL in McRCHis., Vekn. & Keyserl. Russia vol. II, 348, pi. 24 fig. 



5 a— b. 

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



Salter Ajipeudix to Sedgwicks British Pahicozoic Fossils, VI. 

 Fr. Schmidt Untersuch. Silurform. Estlands, 209. 

 Salter Siluria 3d Ed., 550, pi. 25 f. 10. 

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

 Etheridge in Siluria 4:th Ed., 534. 

 LiNDSTROM Nomina fossiliurn Gotlandiie, 23. 

 S.^.lter Catal. Cambridge Sil. Fossils, 67, 153, 171, 185. 

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

 Bronn Nomenclator, 327. 



Mac Coy in Sedgwick's Brit. PaLxoz. Rocks, 287. 

 Etheridge in Siluria 4:tli Ed., 534. 

 Heidenhain Graptolitlifiihrende Gescbiebe der norddeutsclien Ebcne. Zeitschr. 



d. Deutsoh. 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. Defense des Colon. Ill, 41. 



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



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

 almost l)ilatcral, 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 exterior edges of the 

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

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

 indented along the median a.xis 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 



