NOTES ON RETICULARIAN RHIZJPODA. 279 



its less delicately thin shell-wall, its distinct sutural limba- 

 tion, and its square periphery. 



The ''Challenger" specimens are from Prince Edward's 

 Island, 50 to 150 fathoms, and Bass Strait, 38 fathoms. 



Spirillina obconica, n. sp. PL VIII, fig. 27, «, h. 



Characters. — Test free, spiral ; contour elliptical, superior 

 surface conical, inferior surface concave; composed of several 

 (seven or eight) convolutions of a narrow non-septate tube. 

 Shell-wall very thin, foramina minute. Diameter, -^\^ inch 

 (0-25 millim.). 



An exceedingly minute and fragile form, resembling not 

 a little the initial convolutions of Patellina, which are often 

 non-septate. Its oval contour and the fact that it is found 

 in places where Patellina has not been met with, favour the 

 assum])tion that its represents an independent species. 



Sjiirillina obconica occurs with some of its congeners off 

 Prince Edward's Island, 50 to 150 fathoms, and oflf Christ- 

 mas Harbour, Kerguelen Islands, 120 fathoms. Perhaps 

 also in one or two other localities, which I cannot at the 

 moment refer to. 



Spirillina tuberculata, Brady. PI. VIII, fig. 28, a, h. 



SpirilliHa tuberculata, Brady, 1S78. In Siddall's "Foramiiiifera of tlie 

 Dee," ' Proc, Chester Soc. Nat. Sci.,' pt. ii, 

 p. 50. 



Characters {amended). — Test free, planospiral, the two 

 sides seldom quite symmetrical ; peripheral margin rounded 

 in large specimens, often somewhat square in smaller ones. 

 Surface more or less covered with exogenous deposit, filling 

 the sutural depressions except that bounding the final con- 

 volution ; the exterior of the whole shell beset with well- 

 defined raised tubercles, generally more strikingly developed 

 on one side than on the other. Diameter, :f'o^ inch (0"64 

 millim.). 



This species is by no means new, though it remained un- 

 described until a few weeks ago. Many years since I 

 obtained specimens from the south coast of England (off 

 Eddystone), and my friend David Robertson, P.G.S., subse- 

 quently found it in one or two other British localities. In 

 Mr. J. D. Siddall's collection of Foraminifera from the 

 Estuary of the River Dee, a very similar, probably identical, 

 variety occurs. But the British examples are relatively very 

 poor representatives of the species, and they are perhaps a 



