yo PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



tremities, and sometimes coalescing. Surface with two kinds of orifices, 

 though scarcely distinguishable in size. The larger ones are subcircular, 

 the others (cancelli), disposed more or less regularly around these, are 

 more or less angular. 



Diameter of branches 5-10 mm, rarely more. 



Remarks: Heteropora neozelanica is considered identical with H. pel- 

 liculata, by Waters (see: Nicholson, 1880, p. 329); according to Busk it 

 differs from the latter, (i) in the shorter branches, which are never con- 

 nected with each other, (2) in the absence of the calcareous pellicle or 

 epitheca. Our specimens are, as regards the first character, in some de- 

 gree intermediate : the branches, although comparatively shorter and 

 stouter, coalesce frequently. The "pellicle" is not present in them, but 

 this may be due to fossilization. The surface structure is in some places 

 quite well preserved ; it corresponds to Busk's fig. 4, and still better to 

 Nicholson's fig. i B, and differs in this respect from Waters' figure (copied 

 by Nicholson in fig. i D). 



Record of specimens : San Julian, Oven Point ; 2 colonies. San Julian, 

 Darwin Station ; i colony. Arroyo Gio ; 3 fragments. 



Distribution: Living in New Zealand and Japan (Busk, Wat.); fossil 

 at Napier, New Zealand (fide Waters, 1884, p. 696), which beds belong 

 to the Ahuriri series of the Pareora System, Miocene (see Hutton, 1885 

 a, p. 194, 209). 



BRACHIOPODA. 



Fam. RHYNCHONELLID^E d'Orb. 



Gen. RHYNCHONELLA Fischer. 

 15. RHYNCHONELLA PLICIGERA v. Ihering. 



PI. XII, Fig. 3-. 



1897 Rhynchonella plicigera v. Ihering, in: Rev. Mus. Paul., v. 2, p. 270, 

 textf. 7. 



Shell variable in shape, mostly wider than long, irregularly tetrahedral 

 or more or less triangular. Beak more or less acute and slightly re- 

 curved; foramen moderately large, the lower part of it formed by the 

 deltidial plates. Beak-ridges well defined. Smaller valve with a more 



