BY H. I. JENSEN. 817 



Polymorphina sororia (Pl.xxiii., f.3) is rare in the Wollongong 

 material, and is somewhat different from the type figured in the 

 Challenger Report. The test is frail and of similar composition 

 to that of Lagena, and the aperture is polymorphine. There are 

 only two chambers, one of which is enclosed in the other as in 

 Chilostomella ovoidea. The forms found in the Wollono'onf 

 material were either young or micromorphic. The diameter was 

 0-25 mm. 



The Polystomella specimen figured (Pl.xxiii., f.4) and enlisted 

 as P. macella differs from the type of the species by possessing a 

 marked umbilicus on either side in which the inner whorls are 

 clearly visible. It is thus biconcave. Perhaps it also deserves 

 to be ranked as a new species. 



Micromorphism was most marked in the following species of 

 MiliolincB : — Sinroloculina seminulum, S. fragilissijiia^ S. ex- 

 cavata, S. limbata (diam. up to 0'3mm.), S. impressa, and also in 

 many of the Lagenidce, Rotalidm and others, such as Nodosaria 

 scalaris, N. vertebralis, Truncatulina ungueriana, Anomalina 

 arimiensis (diam. 0-25 mm,), Gaudryina subrotundata, tfcc. 



The depth at which the dredgings were made (100 fathoms) 

 and the distance from land (16 miles) were evidently not the 

 optimum for these forms. Globigerina was by far the most 

 abundant organism in the material, which might almost be 

 termed a Globigerina ooze. Only twenty-four of the ninety 

 species enumerated here occur also in Mr. Whitelegge's List of 

 the Port Jackson forms. 



2. Foraminiferal Sand dredged at Byron Bay at a depth of 111 



fathoms. 



For this material I am indebted to Mr. G. H. Halligan, through 

 Mr. C. Hedley. As yet only the coarser shell-sands from this 

 locality have been examined. In this list and in the list of forms 

 identified in sands from other localities forming the rest of this 

 paper, the species mentioned by Whitelegge as occurring in Port 

 Jackson are denoted by an asterisk. 



