NOTES ON RETICULARIAN RHIZOPODA. 71 
encouragement and ever ready help, the tedious details of 
mechanical work which have occupied so much of my time 
during the last four years or more, would have been weari- 
some in the extreme. I hope in the proper place to make 
due acknowledgment of many acts of courtesy that I cannot 
enumerate here, and I will now do no more than mention 
the names of Rev. A. M. Norman, Professor T. Rupert 
Jones, Dr. Carpenter, and Professor W. K. Parker, as 
amongst those to whom I am primarily indebted for assist- 
ance and advice. 
PostscRIPt. 
Since the foregoing paper has been in print, I have received 
through the kindness of Herr Gustav Steinmann, a copy of 
his recently published memoir, “ Die Foraminiferengattung 
Nummoloculina, n.g.” Without entering into any discus- 
sion of the views therein expressed, I may just state that the 
Nummoloculina contrarva of Herr Steinmann is in part, at 
least, the Hauerina borealis of the present paper (p. 46). 
The difficulty of distinguishing Hawerina borealis and 
Biloculina contraria has been already alluded to, and if the 
views put forward by Herr Steinmann be correct, is now 
satisfactorily disposed of. At the same it must be remem- 
bered, on the one hand, that between Biloculina sphera, 
@Orb. and B. contraria, d’Orb. every gradation of form is 
to be found in northern dredgings; and on the other, that 
the alar prolongation of the chamber-walls is a character 
shared by other species of Hauerina. 
