536 Transactions of the Society. 



rarely tliat a specimen can be found showing tlie primordial cell, the 

 latter having been generally obscured by the subsequent growth of the 

 tubular portion. 



Prof. Nicholson and IMr. K. Etheridge, jun., in their monograph 

 of " The Silurian Fossils of the Girvau District," have described a 

 minute vermiform object [GirvaneUa j^^ohlematica] which appears 

 closely to resemble the above. With the hope that Mr. Etheridge 

 would be able to determine their identity, or otherwise, I sent him 

 some examples of the Carboniferous form. Mr, Etheridge was much 

 struck with their apparent resemblance, but as he only knew the 

 ^?iluriau object from polished sections, his determination could go no 

 further. 



In assigning this httle fossil to Hyperammina vagans, it is need- 

 ful to state that though its zoological characters and general habit 

 correspond with those of the recent species the diameter of the tube is 

 much smaller than that of any living specimen hitherto described. 

 Further, that in some instances the transverse fracture of the tube, and 

 the apparent absence of proper investment on the attached side, suggests 

 an affinity with the genus Wehbina', though in other cases this is not 

 apparent. 



Distribution. — Only known from the " D " Limestone of the 

 Tipalt in which it is by no means a rare form. 



Family LITUOLID.E. 



Sub-family Lituolinse. 



Genus Placopsilina, d'Orbigny. 



Flacopsilina cenomana, d'Orbigny. Plate VIII. fig. 4. 



The " D " Limestone, which has added so much to our knowledge 

 of the Palaeozoic Foraminifera, is especially rich in adherent forms. 

 Amongst these there occm' some few which exhibit a close resem- 

 blance in texture and habit of growth to the above species. The test 

 is somewhat coarsely arenaceous, imperfect on the side of attachment, 

 generally more or less spiral in manner of growth (though often a 

 very open spiral), and exhibits at irregular intervals constrictions of 

 the testaceous tube, suggestive of septal divisions. The tube varies 

 consideraldy in size in different individuals, varying from 1/200 in., 

 or less, to 1/75 in. in diameter. The drawing given in Plate VIII. 

 fig. 13 may be taken as an average specimen. 



Distribution. — Only known in connection with the " D " Lime- 

 stone, Tipalt, growing adherent to small fragments of shell and other 

 objects. 



Genus Lituola, Lamarck. 

 Lituola rotundata, sp. nov. Plate VIII. figs. 5, 6. 



Test free, globular, subglobular, or, more rarely, subcyHndrical ; 

 spiral, nautiloid, more or less asymmetrical, consisting of about five or 



