NOTES ON RETICULARIAN RHIZOPODA. 275 



these constitute d'Orbigny's genus Sagriiia. They have been 

 much misunderstood, and have been placed by German 

 systematists, without exception, in the same family Avith 

 Textularia. Of the two species named by d'Orbigny, one^ 

 is biserialj and only betrays its affinity to Uoigcrina by its 

 aperture, which is placed in an erect mammillate protuberance 

 at the top of the terminal chamber ; the other is a Creta- 

 ceous species'^ with an arenaceous test, which is spiral in its 

 earlier growth and finishes biserially. Continental Rhizo- 

 podists have only recognised the latter of these, and Sayrina 

 has consequently been spoken of as an exclusively fossil 

 genus, with characters founded on those of ^S*. rugosa. 

 Messrs. Parker and Jones, however, have shown the rela- 

 tionship which exists between these and some similar forms, 

 and have described two recent dimorphous species/^ in both 

 of which the arrangement of the segments is partly alter- 

 nate or triserial and partly uniserial. To these the " Chal- 

 lenger '' material has brought two additional and even more 

 abnormal varieties, which have been named Sagrina virgula 

 and S. divaricata respectively. 



The generic term is written Sagraina by Reuss and by 

 Zittel. There is no doubt that d'Orbigny named the genus 

 in honour of De la Sagra, the historian of Cuba, but his par- 

 ticular method of doing so does not concern us, and as it is 

 quite clear that the final a was dropped intentionally, we 

 must take the genus as he left it. It is the old story of 

 Textularia and Textilaria, of Orhitolites and OrhituUtes ; 

 the only chance of uniformity in nomenclature lies in 

 the rule of precedence. The systematic names for which 

 classical authority and exactitude can be claimed are few 

 indeed. 



Sagrina virgula, n. sp., PI. VIII, figs. 19— ;21. 

 Characters. — Test linear, straight or curved, cylindrical, ta- 

 pering, composed of many segments. Early segments minute, 

 clustering, obscurely spiral, sometimes wanting ; later ones 

 subglobular, united end to end, and somcAvhat embracing. 

 Aperture wide, with a turned-over phial-like lip. Surface 

 hispid or setose. Length, Vtt inch (0-5 millim.). 



The relationship of S. virgula with the hispid varieties of 

 Uvigerina may be seen by comparing the figures with those 

 of U. interrupta immediately preceding them in the plate. 



1 Sagrina pulcJtella, 'Foram. Cuba,' p. 140, pi. 1, figs. 23, 24. 

 3 Sagrina rugosa, 'Mem. Soc. Geol. Fr.,' vol. iv, p. 47, pi. 4, figs. 31, 32. 

 3 Sagrina raphanus and S. dimorpha, 'Phil. Trans./ vol. civ, p. 364, pi. 

 18, figs. 16—18. > I > i 



