590 MESSES. E. HEEON-ALLEN AND A. EAELAND ON THE 



101. Hauerina ornatissima (Kan-er). 



Quinqueloculina ornatissima Karrer, 1868, MFKB. p. 151, pi. iii. fig. 2. 

 Hauerina ornatissima Brady, 1876, LC. p. 406. 



„ Brady, 1884, FC. p. 192, pi. vii. figs. 15-22. 



Millett, 1898, etc., FM. 1899, p. 610. 



Chapman, 1900, FLF. p. 178. 



14 Stations. 



Occurs sparingly at most of the Stns., and nearly always in a small compressed form 

 with the later chambers arranged in a more or less spiroloculine manner. Large and 

 typical specimens were found only at Stns, 1, 4, 9, and 12. 



Planispikina Seguenza. 



102. Planispirina auriciilata Egger. (Pi. XLVI. figs. 3-7.) 



Planispirina auriculata Egger, 1893, FG. p. 245, pi. iii. figs. 13-15. 

 12 Stations. 



Generally distributed and sometimes comro.on. The best and most typical examples 

 at Stns. 6 and 11. At Stns. 12 and IX it was rare and very small. Practically the 

 only variation observed is in the relative length of the long axis of the shell, two 

 forms being found in company at several Stns., one with a very much broader shell 

 than the other, otherwise externally identical. Viewed as a transparent object in balsam 

 the difference is found to be associated with the development of the initial chambers. 

 The shell commences its growth as an unseptate spiral tube. In the broad specimens 

 this spiral growth continues to as much as two complete convolutions before assuming 

 the spiroloculine arrangement ; in the narrow form the spiroloculine method of growth 

 is assumed after a single convolution. Possibly these two forms represent the megalo- 

 spheric and microspheric generations of the organism. As we pointed out in our Clare 

 Island monograph, our species P. cUarensis possesses close affinities to P. auriculata, 

 and may perhaps be a depauperated northern form of the tropical species, which differs 

 from P. cUarensis in the greater strength and convexity of its test and its larger 

 aperture. 



103. Planispirina exigua Brady. 



Hauerina exigua Brady, 1879, etc., EK,C. 1879, p. 267. 



Planispirina exigua Brady, 1884, FC. p. 196, pi. xii. figs, 1-4, woodcut fig. 5 b, p. 194. 



.', Brady, Parker, & Jones, 1888, AB. p. 216, pi. xl. fig. 4. 



„ Egger, 1893, FG. p. 245, pi. iii. figs. 11, 12. 



„ Millett, 1898, etc., FM. 1898, p. 611, pi. xiii. fig. 13. 



9 Stations. 



Generally distributed, but never very abundant. The best specimens at Stn. 6, 

 where it was most frequent. Two varieties were noticed at this Stn., one a thin-walled 



