KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4. 67 



Some of Ehrenbeegs Strophoconi seem to be identical Avith our form. 



It is not commoii in the chalk-ooze, seldom attaining more than 0,20 mm. in length. 



Fig. 95 : small specimen. 



Fig. 96: the same seen in transmitted light. 



Figg. 97 — 98: two other very small speciraens. 



Syn. Bulimina elegantissima d'Orb., 1839, Voy. Am. merid. 5, p. 51, t. 7, 'äs:^. 13 — 14. 

 » Williams., 1858, Brit. rec. For. p. 64, figg. 134—135. 



» Presli var. elegantissima Park. and Jones, 1865, N. A ti. and aret. Oc; Phil. Transact- 



155. 1, p. 375, t. 15, figg. 12—17. 

 » elegantissima var. Brady, 1878, An. Mag. Nat. Hist. (5) 1, p. 436, t. 21, fig. 12. 



)) subteres Brady, 1881, Qu. Journ. micr. Se. (n. s.) 21, p. 55. 



Rotalina bulimoides Ess., 1851, Sept. Thon Berlin; Ztschr. deiitsch. geol. Ges. 3, p. 77, t. 5, 



fig. 38 (ad hane pertinens see. Parker and Jones 1872. 

 Robertina arctica dOrb., 1846, For. Bass. tert. Vienne, p. 203, t. 21, figg. 37 — 38 (sec. 



Parker and Jones). 

 ? B obliqua dOrb., 1839, For. Craie blanc. Par.; Mem. Soe. geol. Fr. 4, p. 40, t. 4, 



Bulimina (Virgulina) squamosa dOrb. 



Tab. IV, figg. 99—108. 



I am not ablc to trace any sort of essential distinction between Bid. (Virgulina) 

 squamosa d'Oeb. and Bul. {Virgulina) Schreibersiana Czjz. To judge by the representa- 

 tions of the latter given by different authors all agree in the shape and setting of the 

 chambers, being not quite so regular as in Bul. squamosa typica, which seeras to be 

 more biserial in its growth, whilst the Czjzeks form shews some tendency to a multi- 

 serial arrangement. 



The boundary between this species and Bul. (Bolivina) punctata d'Orb. is far 

 from being distinct. And yet Mr. d'Oebigny found himself compelled to distinguish 

 these two species as tAvo genera. 



Bul. squamigera d'Orb. from Canary Islands comes very near to this species and 

 may be more allied to this than to Bul. pupoides d'Orb. 



The variation o\ Bul. squamosa consists chiefly in the greater or less flatness and 

 breadth of the chambers and their greater or less elongation backwards. There is 

 also a slight difference in the size and arrangement of the pores and in the transpa- 

 rency of the shell. 



All our forms are from the chalk-bottom, where they are not unfreqnent. 



Figg. 99 — 103: comes next to Virgulina Schreibersiana Czjz.; it is generally of a 

 dusky hue, so that the pores are scarcely visible in transmitted light. It is not un- 

 common and attains a pretty good size. 



Fig. 104: more textularia-formed, of the same dull hue in transmitted light as 

 the preceding. 



Fig. 105: approaching Bul. (Boliv.) punctata d'Oeb. 



