148 MAJOE OATEN 0:S THE STJEFACE-FAUKA OE MID-OCEAJf. 



recording. Like their kindred tlie Polycystina, tliey appear on 

 the surface after sunset. All that I have hitherto met with have 

 been, as might be expected, of the unattached forms, and they are 

 all included in the two genera GloMgerina and Pidvimdina. 



To Orhulina, which likewise is constantly met with on the sur- 

 face, I shall refer presently. 



A]l the varieties of form of Globigerina, in Mr. Parker's opinion, 

 may be included in two or three subspecies ; G. luUoides, G. in- 

 Jlafa, and G. liirsuta. 



Of the genus FulvinuUna, P. Menardii is the principal repre- 

 sentative. P. Miclieliniana is met with somewhat more rarely. 

 P. canariensis, wiiich the same authority considers to be but a 

 starved-out form of P. Micheliniana, is also found. P. crassa, an 

 Old Chalk form, I have met with in the South Atlantic. These 

 two genera both belong to the second family, Globigerinidse, of 

 Dr. Carpenter's suborder Perforata. 



I have never met with any trace, not so much as a single indi- 

 vidual, of the Imperforata, or of the families Lagenidae and Num- 

 mulinidje of the Perforata. Thus we find one genus of the sub- 

 family E-otahnfe, and one genus of the subfamily of the G-lobige- 

 rinse, alone making the surface of the ocean their home. 



I have never met wdth any form of the subfamily Textularina3. 

 "With regard to Orhulina, Dr. Carpenter in his work ' An Intro- 

 duction to the Foraminifera,' at p. 177, states that it has been con- 

 sidered to be but a development of Gloligerina, and that the 

 young of that genus have been found within it ; in fact it is but 

 a form of Gloligerina. I think he is quite correct, with the ex- 

 ception that it does not contain the young of that genus : a few 

 small chambers attached to each other, precisely as in the com- 

 monest form of G. hulloides, which are generally of a size incon- 

 siderable compared with the outer sphere, are all that are found 

 inside it ; they are firmly attached to its inner surface, and I con- 

 sider them to be its own proper chambers. 



Orhulina may have no internal chambers ; sometimes it has two 

 or three, at other times many may be found within. 



I have not met with any Orhulince that have a large aperture 

 externally ; but their whole surface is perforated with smaller and 

 larger openings for the passage of the sarcode. Dr. "Wallich in 

 his 'North Atlantic sea-bed,' mentions his having found an Annelid 

 at the bottom of the deep sea, to which he gives the credit of 

 boring the shells of the GloUgerince. I fancy it quite likely that 

 the holes found in the Orhdina may be due to the same cause. 



