288 HENRY B. BRADY. 



the " Challenger" collection amongst the salient types above 

 enumerated, and the few exceptions that occur are chiefly 

 in the case of specimens which are obviously monstrous. 

 Nothing has been said of the spinous or hirsute surface- 

 armature in the light of a zoological character, because 

 it appears to possess no specific or even varietal value. 

 Examples of almost every " species" embraced in the 

 foregoing descriptions are met with from time to time, 

 more or less covered with long silky spines, but such speci- 

 mens are naturally much more common amongst those taken 

 at the stirface of the sea than in the contents of the dredge, 

 and the spinous condition is more generally noticed in young 

 and small than in fully-grown shells. 



There are a few recorded forms, though very few, that 

 cannot properly be asigned to any of the species in the fore- 

 going summary. Of these, Glohigerina marginata (Reuss)^ is, 

 perhaps, the most important, as it is one of the best defined 

 Cretaceous forms. It belongs to the *' hulloidcs " group, and 

 to repeat the comparison with the genus Pultinulina, it is 

 the isomorph of P. Menardn, just as Glohigerina ivfiata is 

 the isomorph of P. crassa. I do not recollect ever having seen 

 Gl. marginata in the recent condition, nor, indeed, otherwise 

 than as a Cretaceous fossil.- Two other species, Gl. elecata, 

 d'Orbigny, and Gl. trochoides, Reuss, have also been de- 

 scribed from Cretaceous specimens, but I have been un- 

 able to identify them with any forms I am acquainted 

 with. Both of them bear some resemblance to Glohigerina 

 ruhra in their general features, the latter especially so, but the 

 published drawings have no indication of orifices on the 

 superior surface. 



It will have been gathered from the foregoing resume i\iQ.t 

 the spiral Glohigerince may be roughly divided into three 

 groups on the basis of the position and character of the 

 general apertures, and, to a less degree, on the contour of the 

 test. These are — 1st. The forms with an excavated cavity 

 on the inferior surface (" umbilical vestibule"), into which 

 the orifices of all the segments open — type, Glohigerina hid- 

 loides. 2nd. Those with only one external orifice situated on 

 the face of the terminal segment, at its point of junction with 

 the previous convolution — type, Gl. hifiata. 3rd. Those in 



1 Uosalina marginata, Keuss, 1845. ' Verstein, Bohm. Kreid,' pt. 1, 

 p. 36, pi, 13, fig. 74. Figured better in a subsequent paper 'DenkscLir. d. 

 k. Akad. Wiss.,' vol. vii, pi. 26, fig. 1. 



- It is possible that the Rosalina Linnei ('Foram. Cuba,' p. 106, pi. 5, 

 fig. 10 — 12, called R. Linneiana in the text), found by d'Orbigny on the 

 coast of Cuba, may be the living representative of this species. 



