KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. NIO 4. 63 



Bulimina pupoides D'ORB. 



Tab. IV, figg. 8294. 



A very variable species, the small differences consisting in the chambers being 

 more or less inflated and in the different degrees of overlapping, the chamber-wall 

 being often very much lengthened out backwards so as to enclose a smaller or greater 

 part of the preceding chambers. It is not compatible with a philosophical arrangement 

 to attach to all these individual modifications varietal and even specific designations, 

 as has been done by some authors. 



Our form is remarkable for its extremely thin, glassy test. Owing to its extreme 

 tenuity one or two of the last chambers often become detached from the rest, whence 

 mature specimens in perfect condition are scarce. Sometimes the first chambers are 

 provided with a few delicate folds in transmitted light looking as straight, bright streaks 

 radiating from the primordial chamber. 



Our specimens agree mostly with Bui. pyrula, ovula and ovata D'ORB. 



The spinous form figg. 82 83 may more properly be referred to another species 

 on account of its different poration, but being very young and scarce, there has been 

 little chance of comparing and identifying it with other forms. It is nearly identical 

 with Polymorphina aculeata EHRENBERG. 



Bui. pupoides is not very common in the chalkooze. 



Figg. 8283 the aculeata form. 



Fig. 82 b the same as 82 more enlarged. 



Figg. 84 85: nearly the typical Bui. pupoides D'ORB. 



Fig. 86, more blunt form approaching Bui. pyrula D'ORB. 



Fig. 87: very small specimen, enlarged. 



Fig. 88: with the chambers spirally set in a more regular row, approaching Bui. 

 arctica D'ORB.; 88 b the same more magnified. 



Fig. 89 : small specimen. 



Fig. 90: pigmy form with extenuated chambers, approaching the habitus of Fz'r- 

 gulina, and with radiating folds. 



Figg. 91 93: very young specimens seen from above with radiating folds. 



Fig. 94: slender form, between Bui. pupoides and Bui. (Virgulina) squamosa D'ORB. 



Syn. Bulimina brevis D'ORB., 1839, For. Craie bl. Paris; Mem. Soc. geol. France (2) 4. p. 41. 



t. 4, figg. 1314. 

 auriculata, turgida BAILEY, 1850, Micr. Exam, of Soundings; Smiths. Contrib. 2, Art. 3, 



p. 12, fig. 2530. 



pyrula D'ORB., 1846, For. Bass. tert. Vienne p. 184, t. 11, figg. 910. 



? intermedia Rss., 1845, Bohm. Kreide 1, p. 37, t. 13, fig. 71. 



? Ess., 1850, Kreidemerg. Lemberg; Haid. Nat. Abh. 4. i, p. 39, t. 3, fig. 11. 



pustulosa COSTA. 1854, Pal. Nap. 2, p. 264, t. 15, fig. 8. 



ovulum Rss., 1845, Bohm. Kreidef. 1, p. 37, t. 8, fig. 57; t. 13, fig. 73. 



