On the Anatomy of Apera Burnupi, Z. A. Smith. 221 
I. Séderstrémi, in the colour of its tail, but differs both from 
these and J. Stolzmanni by the extreme hairiness of its ears, 
the restriction of the white of the under surface to the chest 
and centre of belly, and by the slenderness of its incisors. 
XXI.—On the Anatomy of Apera Burnupi, LZ. A. Smith. 
By Watter E. Counce, 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. Heynemann (6), however, suggested the term 
Apera, on the ground that Binney’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 Chlamydophorus, 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. Gibbonsi, W. G. Binney, from Natal (2), and A. Burnupi, 
EK. 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 (8). Mr. Edgar 
A. Smith has pointed out that the carine 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 
Heynemann’s figures (6, T. 2. figs. 5 & 6) of A. Gibbonsi 
the keel which limits the back is not shown. This same 
author (6, p. 19), although only acquainted with the external 
features of A. Gibbonsi, suggested that the genus Apera 
belonged to the Testacellide ; on p. 19 he writes :—“ Dann 
springt uns sofort die nahe Verwandtschaft mit Testacella in 
die Augen, die gemeinsame allgemeine Gestalt (s. Fig. von 
Gibbons), die gemeinsame Lage der Genital-, Athem- und 
After6finung, die ahnliche strahlige Konnelung um diese 
Kérpeiofinung herum, die ahnlche Runzelung wtber die 
Lange des Kickens (s. Figur von Gibbons und seine 
