224 DK. C. T. TIIECHMA>'X OX . [vol. Ixxili^ 



belongs to the first group, which comprises forms with vertical striae 

 on the dental plates and on the adjacent areal portion on each side 

 of them : these, Zugma3-er thinks, may have assisted in attaching 

 a ligament or external muscle. He illustrates three species that 

 show this peculiarity: namely, Sp. uncinota, Sj). koessenensis, ?indi 

 Sp. austriaca ; but they are all non-alate forms with a very high 

 ventral area. 



SpIKIFERIXA Cf. AUSTKIACA Sucss. (PI. XXIY, fig. 5.) 



1882. H. Zuj^maj^er, ' Unter.sucliungcn iiber Ehatisclie Bracliiopoden ' p. 28 & 

 pi. iii, iigs. 6a-6 c. 



Shell about as long as it is wide. Ventral area high and trian- 

 gular, slightly concave, and coarsely striate parallel to the hinge- 

 margin, whicli represents very nearly the greatest width of the 

 shell. The delthyrium is triangular and deeply sunken, the septal 

 arrangement is cj^rtiniform, and the thin median septum is seen 

 towards the apex projecting above the floor of the delthyrium. 

 The ventral beak is bent slightly over the areal region ; the dorsal 

 beak is rounded, rather inflated, and projects slightly above the 

 hinge-area. 



The dorsal valve is semicircular in outline, and has a raised, 

 rather narrow, median fold, and three or four much fainter lateral 

 folds, which cover the shell nearly to the hinge-margin. The ventral 

 valve has a broad and shallow triangular median sulcus, which 

 extends to the a])ex and is bounded by two raised narrow folds,, 

 on each side of which are two or three much fainter lateral folds. 



Length = 38 mm. ; width = 38 mm. 



Locality and horizon. — The New Zealand Geological Survey 

 possesses a specimen from Mount Potts, from which the above 

 description was made. The shell is Avell preserved ; but the del- 

 th3''rium is nearl}^ filled up with rock, and part of the dorsal valve 

 is concealed. 1 am not sure whether it comes from the Kaihiku 

 Series or from the Lower Carnic, but it is probably from the latter. 

 I have three or four smaller, separated, single dorsal valves 

 apparently belonging to this species, some of which have a faint 

 fourth lateral fold. I collected them in low Carnic beds on the 

 north side of the entrance of the Wairoa Gorge. 



Kemarks. — The atti-ibution of this brachiopod to the above 

 Alpine species is conjectural, but it evidently belongs to the grouj) 

 of Sp). uncinafa and Sj). austriaca ; the former, however, has a 

 series of vertical striie on the area next to the delthyrium, which is 

 wanting in the j^i'^sent form and in Sp. austriaca, but is found 

 in the form last described, Sp. nehonensis. In general shape it 

 resembles Spiriprina austriaca, which' occurs in the Starheiraberg 

 Beds of the Alpine Khietic. 



Hector"^ illustrated a drawing of the specimen from Mount 

 Potts under the title of ' Spiriferina (cristata ?),'' the small 

 English Permian fossil, a very different sj^ecies : this gave rise to- 



^ Catal. Ind. & Col. Exhibition (1886) p. 76, fig. 6. 



