244 DR. T. ALCOCK ON POLYMORPHINA TUBULOSA. 



contortum, with stem -leaves very widely auricled at the 

 base. Hayward Heathy Sussex, Mr. Mitten. 



Ancectangium pellucidum, Wils. MS. Near Inverary, 

 Mr. Wilson, but probably a form only oiA. compactum. 



Hypnum {Stereodon) canariense, Mitt. Like H. cupres- 

 siforme, var. mamillatum, but differing in the sharply ser- 

 rulate leaves, with shorter and wider cells. Turk Moun- 

 tain, Ireland, Mr. Wilson, 1859. 



Orthotrichum patens, Br. Dailly, Ayrshire, Dr. Schim- 

 per. 



Dicranum robustum, mentioned in Schimper^s Syn. and 

 Berkeley's Handbook as perhaps occurring near Warring- 

 ton, is not this species, but D. Schraderi. To the kindness 

 of Mr. Wilson I am indebted for the sight of the plant in 

 this habitat. He also mentioned to me the error. 



XV. On Polymorphina tubulosa. 

 By Thomas Alcock, M.D. 



Eead January yth, 1867, 



In the course of examinations of the Dogs Bay sand, I 

 have collected great numbers of detached branches of 

 Polymorphina tubulosa, a form of foraminifer which is not 

 likely ever to be found perfect in shore-sand. I have, 

 however, met with several fine specimens of it with only 

 the tips of the branches broken away ; but the most inter- 

 esting examples are some which are more damaged, and 

 show several structural features difficult, if not impossible, 

 to be seen in any perfect specimens. The main body of 

 the shell of Polymorphina tubulosa has the form of Prof. 



