Recent and Fossil Foraminifera. 423 



Sagrina Parker and Jones. 



291. Sagrina cretacea sp. n. 



(Plate VIII. figs. 8-10.) 



Test minute, smooth, wedge-shaped, compressed and excavated 

 laterally, the edges of the chambers rounded, regularly scalloped, 

 and undercut. The shell commences with a few Uvigerine 

 chambers, followed by 3 to 5 pairs of chambers arranged in a 

 regular biserial manner, the last chamber terminating in a pro- 

 duced phialine neck. The outer edge of each chamber is raised 

 into a slight keel from which the surface of the chambers sinks 

 away towards the sutures and median line of the shell, which is 

 consequently the thinnest part of the test. Length • 2 to • 3 mm. 

 Breadth # 15 mm. 



This pretty little species may be regarded as an isomorph of 

 Bolivina obsoleta (Eley sp.) to which it bears a superficial resem- 

 blance in contour and markings. Its nearest ally is apparently 

 Sagrina aspcra * (Marsson), with which it agrees in size and to 

 some extent in the arrangement of chambers, differing, however, 

 in texture of the shell, which in Marsson's species is rough or 

 prickly. The undercutting of the chambers, which is so marked 

 in the British specimens, is also absent in Marsson's species. 

 Marsson's figure shows only seven chambers in a section of the 

 test, which is megalospheric. Our species may possibly be the 

 microspheric form. 



Sagrina cretacea is probably a widely distributed and typical 

 Chalk fossil. It certainly occurs in the Chalk of Kent (Keston) 

 and Herts (Watford) and Rottingdean (Sussex), and will probably 

 be found wherever closely searched for in the Middle and Upper 

 Chalk. Its small size and resemblance to other species are no 

 doubt the reasons for its having so long evaded observation. 



Sub-family 4. Ramulininae. 



Ramulina Rupert Jones. 

 292. (h-a) Ramulina aculeata Wright. 



Dentahna aculeata d'Orbigny 1810, Mem. Soc. Geol. France, vol. iv., mem. 



1, p. 13, pi. i. figs. 2, 3. Facsimile in Science Gossip, 1870, p. 81, 



fig- 76.] 

 Ramulina aculeata (d'Orbigny) Wright, 1886, Proc. Belfast Nat. Field Clul> 



(1884-85), App. ix., p. 331, pi. xxvii. fig. 11. 

 Ditto. (Wright) Egger, 1899, Foram. Kreidemergeln der Oberbayerischen 



Alpen, p. 135, pi ii. fig. 3. 



* Sagrina aspera, Marsson, 1878, Mitth. Nat. Ver. Neu-Vorpornmern u. Riigen, 

 Jahrg. x. p. 157, pi. iii. fig. 26 a-d. 

 Sagrina aspcra (Marsson) Egger, 1899, Foram. Kreidemergeln der Ober- 

 bayerischen Alpen, p. 134, pi. xv. figs. 11, 12, 57. 



