30 HENRY CLIFDEN BUBNUP. 



Ennea connollyi Melv. & Pons. 

 Ennea inhluzaniensis n. sp. . 

 Ennea jiixtidens Melv. & Pons. 

 Ennea premnodes Star. 

 Ennea montana Melv. & Pons. 

 Ennea ponsonbyi n. sj). 

 Explanation of Plates 



69 

 71 



72 

 73 



75 



78 

 80 



Introduction. 



In the following pages an attempt is made to clear up some 

 of the difficulties that stand in the way of the student seeking 

 an intimate acquaintance with the genus Ennea, as repre- 

 sented in South Africa. Special attention is given to the 

 comparison of kindred forms and to the consideration of the 

 value of the diiferences between one form and another, 

 whether they amount, in the opinion of the writer, to specific 

 or varietal distinction, or are too trivial to warrant separate 

 treatment. 



The result of the investigation, as far as it goes, is the 

 recommendation that seven species and two varieties be con- 

 sidered synonyms, and two species be degraded to varietal 

 rank. It has been found necessary to differentiate six varieties 

 of known species, and four species that do not seem to have 

 been described. 



The alterations involved are as follows: Ennea laby- 

 rinthea, microthauma, hypsoma, oppugnans, and 

 periploca of Melv. & Pons, to become synonyms of Ennea 

 is,r cinhari Melv. & Fons.i. typica; Ennea callista J/eZv. & 

 Pons, to become a synonym of Ennea marine Melv. & Pons.; 

 Ennea parallela Melv. & Pons, to become a synonym of 

 Ennea montana Melv. & Pons.; Ennea isipingoensis 

 Stur. var. cylindrica Stwi'. to become a synonym of Ennea 

 isipingoensis f. typica; Ennea isipingoensis var. 

 simillima Stur. to become a synonym of Ennea 

 isipingoensis var. discrepans Stur. : Ennea berthas 

 3Ielv. & Pons, to become a variety of Ennea farquhari 

 Melv. & Pons.; and Ennea vitreola Melv. & Pons, to become 

 a variety of Ennea columnella Melv. & Pons. 



