On the Anatomy o/"Apera Buruupi, E. A. Smith. 221 



/. Sdderstronu\ in the colour of its tail, but differs both from 

 these and /. Stohmanni by the extreme liairiness of its ears, 

 the restriction of the white of the under surface to the chest 

 and centre of belly, and by tiie slenderness of its incisors. 



XXI. — On the Anatomy of Apcra Burnupi, E. A. Smith. 

 By Walticu E. Collinge, F.Z.S., Assistant Lecturer 

 and Demonstrator in Zoology and Comparative Anatomy, 

 Mason University College, Birmingham. 



[Plate v.] 



The genus of slugs known as Apera was originally con- 

 .stituted by Binney (2) in 1879 under the term Chlamy- 

 dephorus. lieynemann (6), however, suggested the term 

 Apera, on the ground that Biiiney's name indicated a false 

 characteristic, viz. the presence of a mantle-lobe. Later, 

 Mr. Edgar A. Smith (8) pointed out that Agassiz (1) had 

 employed the term Chlomydophorus, which is practically the 

 same as that used by Binney, for a group of mammals, a 

 fact which Heynemann does not seem to have been aware of. 



There are only two known species of this genus, namely, 

 A. Gilhonsi, W. G. Binney, from Natal (2), and A. Burnupi^ 

 E. A. Smith, from Natal (8). 



My best thanks are due to M. Edgar A. Smith, for his 

 kindness in supplying me with the material upon which these 

 observations on the anatomy have been made. 



The specimen from which all the figures were drawn 

 measured 49 millim. in length. It corresponded in all 

 external features to the original description (S). Mr. Edgar 

 A. Smith has pointed out that the carinas are doubtless much 

 accentuated in alcoholic specimens ; this I can confirm, for on 

 being immersed in very weak alcohol they were much less 

 conspicuous, the dorsum being more convex. Mr. Smith has 

 since sent me a note of some observations he made upon a 

 living example, in which he points out that the keels are 

 visible but less acute than in the contracted state. In 

 Heyneraann's figures (6, T. 2. figs. 5 & 6) of A. Gihbonsi 

 the keel which limits the back is not shown. This same 

 author (6, p. 19), although only acquainted with the external 

 features of A. Gihbonsi, suggested that the genus Apera 

 belonged to the Testacellid« ; on p. 19 he writes : — " I)ann 

 springt uns sofort die nahe Verwandtschaft mit Testacella in 

 die Augen, die gemeinsarae allgemeine Gestalt (s. Fig. von 

 Gibbons), die gemeinsame Lage der Genital-, Athem- und 

 Afterofinung, die ahnliche strahlige Konnelung urn diese 

 Korpeioffnung herura, die ahnliche Runzelung iiber die 

 Lange des Kiickens (s. Figur von Gibbons und seine 



