KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 19. NIO 4. 97 



Syn. Truncatulina sublobatula, Rot. ammophlla, macrocephala GUMB.. 1808, Nordalp. Eocau.; K. 



Bayr. Ak. Wiss. Abh. 1. 10. 2, p. 659, 652, t. 2, fig. 103; figg. 9091 

 (in PI. Ungerianam transieus). 



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

 PSoldania hcxagona COSTA, ibid. p. 248, t. 20, fig. 6. 



Truncatulina magnifica COSTA, ibid. t. 14, fig. 3. 

 Rotalia deplanata Rss., 1855, Kreidegeb. Meklenburg; Zeitschr. deutsch. geol. Oes. 7, t. 11, 



fig. 3. 

 Truncatulina concinna Rss., 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 KARK., 1870, Kreidef. Leitzendorf; Osterr. geol. Reiclisanst. Jhrb. 20, p. 183, 



t. 11, fig. 14. 

 Rotalina pusilla SCHWAG., 1863, Jurass. Sch.; Wiirtemb. Nat. Verein. Jhrhft. 21, p. 141, t. 7, 



fig. 20. 



Bosalina galiciana ALTH, 1850, Utngeb. Lemberg; Haid. Nat. Abh. 3. 2, p. 265, t. 13, fig. 20. 



Truncatulina lobatula MARSS., 1877, Riig. Sclireibekr.; Greifsw. Nat. Verein. Mittheil. 187778, 



p. 167, t. 5, tig. 38. 



advena D'ORB., 1839, Cuba p. 87, t. 6, figg. 35. 



? communis Rss., 1855, Tert. Schicht. nbrdl. u. raittl. Deutsehl.; Wien. Ak. Sitz.-Ber. 



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

 oblongata Rss., 1863, For. Crag. d'Anwers; Bull. Ac. Belg. (2). 15, p. 155, t. 3, 



fig. 45. 



Candei D'ORB., 1839, Cuba p. 88, t. 3, figg. 68. 

 Rosalina Bosqueti Rss., 1861, Kreidetuft'. 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. 



Planorbnlina farcta var. vulgaris D'ORB. 



Tab. VII, figg. 226227. 



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

 using the more philosophical way of arrangement initiated by Messrs. PARKER and 

 JONES, 3 or at the most 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 have 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 Truncatulina variability D'ORB. Webbina lewis and tuberculata SOLLAS, Plan, vulgaris 

 D'ORB., Acervulina W. SCHULTZE are originated. In other instances the same attached 

 species adopts a more regular growth, such as Truncatulina lohatula WALK, or the ty- 

 pical Plan, farcta FIGHT, 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. 



I Q 



K. Sv. Vol. Akaii. Hand!. Brt. 19. N:o 4 



