two new Genera allied to Loftusia. 183 



the " tubuli '•" Jo not present any " transverse internal parti- 

 tions," as I have a polished section of Parkeria which Dr. 

 Millar gave me, on which, iiere and there, these appear to me 

 to be distinctly evident, and in a section through tlie centre 

 of one of the Parkerice from the Karakoram Pass I also dis- 

 tinctly saw one in a portion of the tubuliferous structure 

 which had been raised above the polished surface by etching 

 with dilute nitric acid, while at the same time I could see 

 nothing in this section particularly different from that of 

 Parkeria, Carp , except that the lapidihcation is much more 

 compact and crystalline and that there is an appearance of a 

 darker, tree-like portion branching from the centre to the cir- 

 cumference, which seems to arise from the presence of the 

 bundles of longer-tubed structure having been bent into this 

 form, also seen, but in a straighter one, in the same kind 

 of polished section of the Cambridge Parkeria. 



It is also worth noticing that Loftusia and Parkeria are 

 found together both in the '' Greensand " of Cambridge and 

 at the Karakoram Pass, in Asia. 



Provisional Characters of the Families Parkeriidaj 

 aiid Loftusiidaa. 



ParkeriidsB. 



Minute or basal structure consisting of tubuli intercom- 

 municating freely with each other in juxtaposition, pierced by 

 larger tubes (the zooidal tubes of Nicholson, I. c), which 

 radiate from the centre to the circumference. Specimens 

 generally nucleated by, or growing upon, a foreign body. 



Loftusiidse. 



Minute or basal structure consisting of a ^'i^asi'-membrano- 

 labynnthic, hollow, reticulated fabric charged with foramini- 

 leral detritus. 



EXPLANATION OF PLATE XIII. 



Fig. 1. StoliczhieUa Theobakli, nat. size. Half the specimen. Lateral 

 view, showing : — a, steUitbrin group of segments on tlie surface ; 

 b, external ends of internal segmentation ; c c, foraminiferal 

 detritus; t?, insulated ends of internal segmentation; e, portion 

 of fossil broken out. 



Fiff. 2. The same. Basa, nat. size, a a, lines of segmentation ; b, 

 lozenge-shaped ends of truncated segments ; c c c, foraminiferal 

 detritus represented by the dark shade ; d, discoid foraminiferal 

 test. 



13* 



