344 PROF. W. AMALITSKY ON PERMIAN [Aug. 1 895, 



PaL^OMTJTELA aff. GoLOWKINSKTANA, mihi. (PI. XII. fig. 7.) 



Compare 1892. Palceomutela Golowlcinskiana, Amalitsky, Palaeontographica, 

 vol. xxxix. p. 171, pi. xxi. figs. 24, 25, 29, 30. 



The figure represents a young form belonging without doubt to 

 the group of Palceomutela Keyserlingi. The definition of the young 

 specimens of this group is very difficult, because with age come 

 considerable changes. Nevertheless, it is possible to say with 

 certainty that the specimen here referred to is very similar to the 

 young examples of Palceomutela Golowlcinskiana. I hope that in 

 future more forms will be found which will enable me to unite 

 this African shell with P. Golowlcinskiana. 



Dimensions : length 7, breadth 5, depth 4. Russian forms : 

 length 11|, breadth 7|, depth 4. 



P. Golowlcinskiana is found in Russia in the Permian marls and 

 sandstones of the Oka- Volga basin. 



Locality. South Africa : Diamond mines at Kimberley. 



Pal^omutela, cf. Keyserlingi, mihi. (PI. XII. fig. 4.) 



1892. Palceomutela ILeyserlingi, Amalitsky, Palaeontographica, vol. xxxix. p. 168, 

 pi. xxi. figs. 9-14. 



The South African form of this species differs from the Russian 

 in its larger dimensions, which makes it approach more nearly the 

 thick and large variety of Palceomutela orthodonta, var. crassa 

 (Paheontographica, vol. xxxix. p. 169, pi. xxi. figs. 22, 23), which 

 belongs to the group of Palceomutela Keyserlingi. 



In Russia P. Keyserlingi is found at the upper horizons (A, B, C) 

 of the Permian marls and sandstones at Nishny-Novgorod, and is 

 especially frequent at horizon C. 



Dimensions : length 16, breadth 10, depth 8 ; Russian forms : 

 length 12, breadth 7J, depth 6. 



The above-mentioned P. orthodonta, var. crassa, measures : length 

 16, breadth 10, depth 8. 



Locality. South Africa : Beaufort Beds, at Graaf Reinet. 



Pal^omtttela, cf. ovalis, mihi. (PI. XII. fig. 8.) 



1892. Palceomutela ovalis, Amalitsky, Palaeontographica, vol. xxxix. p. 169, 

 pi. xxi. fig. 8. 



This badly preserved but typical internal cast bears a great 

 similarity to the casts of Palceomutela ovalis, mihi. The impression 

 of the hinge-line shows several small irregular teeth. 



In Russia Palceomutela ovalis is found in the Upper Permian 

 marls and sandstones of the Oka-Yolga basin, on horizon C at 

 Nishny-Novgorod, and on horizon A at the river Vetluga. 



Dimensions : length 12-13, breadth 6|-7, depth 5-6. Russian 

 forms: length 16, breadth 10, depth 8. 



Locality. South Africa : Graaf Reinet. 



