38 HALKYARD, Fossil Foraminifera of the Blue Marl 



Of the above n species the first 6 have previously been 

 assigned to the genus Sagrina but on account of tneir internal 

 structure are transferred to Siphogenerina. The former 

 genus is thus reduced to a very small one, but undoubtedly, 

 to my own knowledge, 6\ nodosa, Parker & Jones, will still 

 remain a member of it, as showing no internal tube, and having 

 the early portion of the test formed as in Uvigerina. 



[63. Sagrina raphanus, Parker & Jones.] 

 63A. Siphogenerina raphanus, (Parker & Jones.) 



{Jvigerina (Sagrina) raphanus, Parker & Jones, 1865, Phil. 



Trans., p. 364, pi. XVIII, figs. 16, 17. 

 Sagrina raphanus, Brady, 1884, Chall. Rep., vol. IX, p. 585, 



pi. LXXV, figs. 21-24. 



The species is very rare in our gatherings, only two long 

 slender specimens being found in gathering No. 2, 1893. The 

 transverse sutures of these specimens are slightly recurved in 

 the uniserial portion of the test, which is also slightly com- 

 pressed. In this respect they resemble the compressed 

 Bigenerince, viz., B. capreolus, and B. pennatula. 



Schlumberger refers this species to the genus Siphogener- 

 ina under the name of 6". costata, but it does not differ in any 

 important respect from the specimens described by Messrs. 

 Parker & Jones in 1865. The species is very variable in form 

 ranging from long narrow examples with sharp, much elevated- 

 cost?e to short, stout individuals with rounded longitudinal 

 ribs. The earlier portion of the test is sometimes Textularian 

 and sometimes Uvigerine, and even when biserial it often 

 shows a sort of tendency to Uvigerine. growth by the line .of 

 juncture of the two series of chambers being more or less 

 oblique or twisted, generally towards the right. 



By personal examination of some Australian specimens in 

 my own collection I have noted the presence of a series of 

 median internal tubes, but owing to the infiltration of the 

 Biarritz specimens with calcite and pyrites I have not been 

 able to observe in them a similar structure. 



(These specimens if correctly identified should in our 

 opinion be referred to Sagrina raphanus P. & J. but we are 

 not satisfied as to their identity. They are much longer and 

 narrower than any specimens of S. raphanus that we have ever 

 seen, and there is no evidence of any Uvigerine commencement. 

 We should have ascribed them with little hesitation to 

 Nodosaria obliqua. (Linne.) ) 



