TaE CARNIVOROUS SLUGS OF SOUTH AFRICA. 113 



named the Aperidai. In 1906 Heynemann^ devoted a para- 

 graph to the genus in his article on the geographical distri- 

 bution of slugs. In 1907 Dr. Pilsbry - followed Moellendorii's 

 example aud placed the genus in the family Ape ridte, which 

 he included in his super-family Agnathomorpha; and he 

 suggested that it might prove to be more nearly related to 

 the Rhytididas than to the other carnivorous families. 



In 1909 and 1912 Simroth-^ included in Bronn's 'Tier-Reich' 

 some of the information given in Collinge's articles, and 

 published copies of four of the figures which had illustrated 

 his first paper in the ' Annals of the South African Museum.' 



In 1910 Collinge * gave a short account of the external 

 features of the three species of Apera then known to inhabit 

 Natal, together with a definition of the genus, and some 

 remarks on its habits, distribution, afiinities, and history. 

 This paper contains valuable quotations from letters of 

 Gibbons and Burnup, but the error about Apera burnupi is 

 repeated. In treating of the affinities of the genus, Collinge 

 again stated that he considered that P. and F. Sarasin were 

 wrong in regarding Apera as in any way related to A topus; 

 but he now expressed the opinion that it was not related to 

 Testacella either, and thought that it should probably 

 stand by itself as a remnant of some very ancient stock of 

 carnivorous Pulmonates. Accordingly he placed it in a 

 separate family, which he termed the Aperaida? fain, iiov., 

 being apparently ignorant of the classification of both 

 Moellendorff and Pilsbry. 



Lastly, in 1912, Major Connolly Mncluded Apera in his 

 valuable " Reference List of South African Non-marine Mol- 

 lusca," following Collinge's nomenclature of the species. 



Such is the story of the treatment that Apera has received, 



' ■ Abhandl. Her. v. d. Senkenb. Naturf . Gesell. (Frankfurt)," vol. 

 XXX, p. 23. 



- • Manual of Conchology ' (2nd ser.), vol. xix. pp. ix, xi. 



^ ' Klassen und Ordnungen des Tier-Reichs III. Gaistropoda Pul- 

 nionata,' pp. 143, 611, 612, fig. 42c, pi. iv, figs. 9-11. 



* "Ann. Natal Mus.," vol. ii, pp. 163-170. 



■' • Ann. S. Afi-. Mus.," vol. xi, pp. 62, 63. 



