Vol. Ill, part 2, issued October 22nd, 1916. 



TKE CARNIVOROUS SLUGS OF SOUTH AFRICA. 



107 



Studies on 

 The Carnivorous Slugs of South Africa, 



INCLUDING 



A Monograph on the Genus Apera, and a Discussion on 



the Phylogeny of the Aperidae, Testacellidse, and 



other Agnathous Pulmonata. 



By 

 Ilii^h \l'at«»oii, ITI.A. 



With Plates VII-XXIV. and 7 text-figures. 



Contents. 



Introduction ...■•• 

 The History ob^ the Genus Apera 

 A Description of the Genus Apera 



External Characters . . . • • 



Tlie Structure of the Skin .... 



The Shell, the Mantle-cavity, and the Mantle 

 The Pedal Gland ..... 



The Nervous System . . . • • 



The Structure of the Upper Tentacles, and the Tentacular 

 Retractors . . ■ ■ 



The Digestive System . . . . • 



The Vascular System ..... 

 The Excretory System . . . • ■ 



The Reproductive Organs . . . • 



Distribution ....'• 

 The Differentiai, Characters of the Species and Sub- 

 species of Apera . 

 Apera gibbonsi (Binney) 



rubella n. suhsp. 

 „ gracilis n. suhsp. 



hipata n. stihsp. 



VOL. 3, part 2. 



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