Manchester Memoirs, Vol. Lxii. (191 7) 27 



47. Placopsilina aggregata, sp. nov. 



PI. VIII, figs. 3, 4- 



Test adherent, sub-conical in form, arenaceous, rough and 

 thick; consisting of about five chambers, which are variable in 

 form, and have no floor on the attached surface. Aperture, a 

 simple arched opening in the wall of chamber where applied 

 to the object to which the test is affixed. Greatest diam. 

 1.02 mm. 



Two specimens (one of which is broken) have been found. 

 They are both attached to worn fragments of Operculina com- 

 planata and, as both are figured here, little remains to be said 

 about them. It may, however, be remarked that though the 

 arrangement of the chambers in the two specimens seems. to 

 be similar, it is difficult to make out what that arrangement is, 

 and especially what place in the series the apical chamber 

 actually occupies. The specimens cannot be assigned to any 

 other arenaceous species found in these gatherings, or con- 

 sidered as immature forms of such species, so I am driven to 

 create a new species for them much as I dislike to multiply the 

 already overburdened nomenclature of the Foraminifera. 



(The absence of any definite floor, beyond a thin film on 

 the surface of the Operculina to which the specimens are 

 attached, which was originally probably chitinous, leaves little 

 doubt in our mind, when taken in connection with 'the rough 

 texture of the wall, that these specimens should be referred 

 to our species India diaphana. (See our note to No. 46.) 



47A. [Placopsilina cenomana, d'Orbigny.] 



[Placopsilina cenomana. d'Orbigny, 1850, etc., PP. vol. ii, 



1850, p. 185, No. 758. 

 P. cenomana, Brady, 1884, FC. p. 315, pi. XXXVI, figs. 1-3-] 



Genus Bdelloidina, Carter. 



48. Bdelloidina aggregata, Carter. 



Bdelloidina aggregata, Carter, 1877, Ann. Mag. Nat. Plist., (4), 



vol. XIX, p. 201, pi. XXII, figs. 1-8. 

 B. aggregata, Brady, 1884, Chall. Rep., p. 319, pi. XXXVI, 



figs. 4-6. 



Rare, and variable in the proportions of the chambers. 



(The previous fossil records appear to rest on Brady's 

 mention that Prof. Rupert Jones possessed a drawing of a 

 specimen adhering to a cretaceous Annelid. Chall. Rep. ut 

 supra, p. 320.) ) 



