KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4. 97 



Syn. Truneatulina sublobatula, Bot. aramophila, maeroeephala Gumb.. 1868, Nordalp. Eocän.; K. 



Bayi-. Ak. Wiss. Abh. 1. 10. .2, p. 659, 652, t. 2, %. 10.3; figg. 90—91 

 (in Pl. Ungerianam transiens). 

 Anomalina explanata Cosca, 1854, Pal. Nap. 2, p. 252, t. 14, fig. 4. 

 PSoldania hexagona Costa, ibid. p. 248, t. 20, fig. 6. 



Truneatulina magnifiea Costa, ibid. t. 14, fig. .3. 

 Rotalia deplanata Kss., 1855, Kreidegeb. Meklenburg; Zeitschr. deutsch. geol. Ges. 7, t. 11, 



fig. 3. 

 Truneatulina eoneinna Ess., ibid. p. 285, t. 11, fig. 4. 



» Dekayi "Rss., 1861, Griinsand, NewYersey; Wien. Ak. Sitz.-Ber. 1.44, p. 338, t. 7, 



fig-. 6. 

 » horrida Karb., 1870, Kreidef. Leitzendorf ; Osterv. geol. Reichsanst. .Ihrb. 20, p. 183, 



t. 11, fig. 14. 

 Kotalina pusilla Schwag., 1863, Juvass. Scli.; Wiirtemb. Nat. Verein. .Jhrhft. 21, p. 141, t. 7, 



fig. 20. 

 Rosalina galieiana Alth, 1850, Uingeb. Lemberg; Haid. Nat. Abh. 3. 2, p. 265, t. 13, fig. 20. 



Truneatulina lobatula Marss,, 1877, Rug. Schreibekr.; Greifsw. Nat. Verein. Mittheil. 1877 — 78, 



p. 167, t. 5, fig. 38. 

 » advena l>'Orb., 1839, Cuba p. 87, t. 6, figg. 3 — 5. 



? )) eommunis Rss., 1855, Tert. Schicht. nördl. u. raittl. Deutschl.; Wien. Ak. Sitz.-Ber. 



1. 18, p. 242, t. 5, fig. 56. 

 1) oblongata Rss., 1863, For. Ci-ag. d'Anwers; Bnll. Ac. Belg. (2). 15, p. 155, t. 3, 



fig. 45. 

 Candei d'Okb., 1839, Cuba p. 88, t. 3, figg. 6—8. 



Rosalina Bosqueti Rss., 1861, Kreidetuff. Maastr.; Wien. Ak. Sitz.-Ber. 1. 44, p. 316, t. 3, 



fig. 1. 

 Rosalina Edwardsiana d'Orb., 1839, Cuba, p. 101, t. 1, figg. 8 — 10. 



Plaiiorbiilina farcta var. vulgaris dOrb. 



Tab. VII, figg. 226—227. 



If one should venture to dispose the Planorbulina forms into species, instead of 

 usino- the inore philosophical way of arrangeinent initiated by Messrs. Parker and 

 Jones, 3 or at the inost 4 forms might be distinguished by somewhat specific charac- 

 ters. This genus is next to Nodosarina the clearest example of the advantage of the 

 nomenclatural system adopted by those eminent naturalists. 



Some or perhaps all of these species liave a free and an attached form, whence 

 it will be obvious, that a number of varieties may result from the different modes of 

 life. The attached forms have a great propensity towards irregular growth, and forms 

 like Truneatulina variahilis d'Orb. Wehhina Icevis and tuberculatn Sollas, Plan. vidgaris 

 n'ORB., Acervulina W. Schultze are originated. In other instances the same attached 

 species adopts a more regular growth, such as Truneatulina lobatula Walk. or the ty- 

 pical Plan. farcta Ficht. and Moll,, and when it passes its life in a free condition, its 

 shape may be more or less nautiloid. 



It may for this reason be proper to arrange Planorb. vulgaris as a variety under 

 Plan. farcta and take Plan. lobatula as quite synonymous with the typical farcta, 

 maintaining the latter name for the species, notwithstanding the priority of lobatula. 



K. Sv. Vot. Akad. Ilanrtl. Brl. 19, N:o 4 ' "^ 



