KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4. 63 



Bulimiiia pupoides dOrb. 



Tab. IV, figg. 82—94. 



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 rauch 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 charaber. 



Oiir specimens agree mostly with Bul. 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 coraparing and identifying it with other forms. It is nearly identical 

 with Polymorjihina aculeata Ehrenberg. 



Bul. pupoides is not very common in the chalkooze. 



Figg. 82 — 83 the aculeate form. 



Fig. 82 b the same as 82 more enlarged. 



Figg. 84—85: nearly the typical Bul. pupoides d'Orb. 



Fig. 86, more blunt form approaching Bul. pyrula d'Orb. 



Fig. 87: very small specimen, enlarged. 



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

 arctica d'Orb.; 88 b the same more magnified. 



Fig. 89 : small specimen. 



Fig. 90: pigmy form with extenuated chambers, approaching the habitus of »F?;')'- 

 gulinan, and with radiating folds. 



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



Fig. 94: slender form, between Bul. pupoides and Bul. (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. 13—14. 

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



p. 12, fig. 25—30. 

 pyrula ju'Okb., 1846, For. Bass. tert. Vienne p. 184, t 11, figg. 9—10. 



? « intermedia llss., 1845, Bölim. Kreide 1, p. 37, t. 13, fig. 71. 



? » » Rss., 1850, Kreideraerg. 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. 



