100 Transactions. 



out branches present themselves, they may belong to Mopsea, 

 or to parts of Isis where no branching occurs. Usually, 

 however, the Mopsece have extremely slender polyparites, so 

 that probably all stout and simple calcareous bodies belonging 

 to the Isidinece should be classified as belonging to the genus 

 Isis." 



The specimens now described, being often branched, are 

 therefore placed in the genus Isis. 



This species differs from Isis dactyla, Tenison- Woods, in 

 that the condyles are radiately, not concentrically, striated. 

 It is abundant in the greensands accompanying the limestones 

 at Kakanui. 



Graphularia, sp. 



Quadrate calcareous axes referable to this genus are frequent 

 in all the limestones of the Oamaru district. They are very similar 

 to Gr. robince, McCoy.* 



Brachiopoda. 

 Terebratula gravida, Suess. Plate XIV, fig. 2. 

 f 1865 : Waldheimia gravida, Suess, Reise der " Novara," 

 Palse., p. 56, pi. ix, figs. 5a and 5&. 1886 : Terebratida, 

 sp. (figure only), Hector, " Catalogue of the New Zealand 

 Court, Indian and Colonial Exhibition," p. 57, fig. 6. 1905 : 

 Terebratula gravida, Hutton, Trans. N.Z. Inst., 1905, p. 475. 



The larger Brachiopoda occurring abundantly in the quarry 

 limestone were originally labelled W. gravida by Hutton, as 

 specimens in the Otago Museum show. When, however, in 

 Canterbury, he obtained specimens showing the brachial arms, 

 he hesitated to identify it with Suess's species, and labelled it 

 merely Terebratula, sp. The Kakanui shell differs from Suess's 

 description in showing no deltidium, as the thickened anterior 

 wall of the foramen grows forward over the umbo of the dorsal 

 valve. But as Suess's figures show no deltidium and no brachial 

 arms, this identification should hold good. 



This species is extremely abundant in the quarry, and occurs 

 in all stages of age. That figured is an old-age form, showing 

 a fold in the dorsal valve. It is not unlike some British oolite 

 species. Younger forms are smoother, the walls of the foramen 

 are not so thickened, and the umbo is more produced. 



It also occurs in the the limestone underlying the mineral 

 breccia. At Oamaru Cape the individuals are smaller, and the 

 umbo is more produced. 



* Prodrom. Palse. Vict., Dec. v, p. :?_\ pi. xlviii. figs. 2-4. 

 •(•The references to species in (his paper do not have any pretence 

 io completeness. For the sake of brevity, only such ace pven as hear on 



ill.- name and priority of the Species. 



