Foviiiiiinifera of South Gornwall. 39 



is the precise position and relationship of this organism, but I 

 believe Mr. Siddall's specimens to belong to the species described 

 many years ago by Mr. Carter under the name Squamulina varians 

 and treated by him as a near ally of Haliphysema tumanowiczii, 

 with which it is often found associated." * The Siddall Collection 

 is now in our possession, but tlie type of P. kingsleyi is missing. 

 Siddall's only description of the type is " a double-chambered form 

 which seems intermediate between P. bulla Brady and P. cenomano. 

 d'Orbigny." The figure is extremely poor, but suggests the latter 

 species. The type of Siddall's other record " Placojjsilina spp. 

 d'Orb.," dredged by Mr. A. 0. Walker off Hilbre Island, is in the 

 collection and is obviously an attached Gromia. 



In any case, Brady's allocation of Carter's S. varioMS to Placop- 

 silina will not hold, the generic differences being too great. Millett 

 records Placopsilina varians (Carter) .in a MS. list of " Eecent 

 Foraminifera of Marazion, Mounts Bay, supplied to Prof. Jas. 

 Clark, -ith March, 1906." This specimen is not, of course, in the 

 Millett Collection now in our possession, but another mount 

 labelled " P. varians, Broadsand, Torbay," is in the collection, 

 which is Iridia diajohana of the same form as the Bognor and 

 Selsey specimens. There is also a slide labelled " P. India ? Weh- 

 hina hcmisph/i'rica " (no locality) which is clearly the young, 

 depressed, hemispherical, early stage of our species. 



Carter's allocation of his species to Schultze's genus cannot 

 stand, owing to the admitted differences in the nature of the test. 

 The specimens cannot be placed with Placopsilina, having nothing 

 in common with that genus except the rough exterior of the test, 

 and,_ moreover, possessing certain generic features such as the 

 chitinous lining and basal membrane of attachment which are not 

 found in Placopsilina. 



Carter's specimens must therefore be assigned to our genus 

 Iridia, which is based on these special features. The -'elevated 

 convex form," which appears to be quite distinctive, must retain 

 ■Carter's specific name and be known as /. varians (Carter), and 

 his "amoeboid form," which is identical with our type species, 

 must become /. diaphana.\ 



Since the above was written our views have been confirmed by 

 the finding of numerous specimens, identical in size, construction 

 and appearance with Carter's /. varians, growing on the roots ol' 

 Lariiinaria at I'Etacq in the N.W. of Jersey in company with both 

 species of Haliphysema. 



* This is undoubtedly the case. A slide in the IMillett Collection now in our 

 possession contains an algal fragment covered with specimens of H. tumanowiczii 

 and its basal plates, and also undoubted specim.ens of the organism under con- 

 sideration. 



t H-A. & E. 1914, P.K.A. pi. xxxvi. figs. 6-12. 



