466 On a new Species of Slug from South Africa. 



The known species A. Oihbonsi also occurs in South 

 Africa. 



Apera Burnupi. 



Corpus (in alcoh. serv.) mediocriter elongatum, quadratum, postice 

 leviter dilatatum, antice parum attenuatum, superne utrinque 

 dorsum carinatum, carina secunda prope pedem, a capite ad longit. 

 totius 1^ ostendente, utrinque instructum, undique granulatum, 

 sordide luteum, maculis punctisque nigris copiose pictum ; dorsum 

 inter carinas concavum, striis duobns parallelis a capite usque ad 

 extremitatem caudse sculptum, striis foramina radiantibus orna- 

 tum ; latera ajque concava ; caput obtusum ; tentacula contracta ; 

 pes luteus, immaculatus, marginibus distinctis circumscriptus ; 

 testa tenuissima. 



Longit. 28 millim., diam. 8 ; foramen ab extremitate ad 8 millim. 

 situm. 



The quadrate form of this remarkable animal at once 

 distinguishes it from any other slug. The keel or angle which 

 limits the back on each side extends from the head to the 

 posterior extremity. On the other hand the lateral keels or 

 ridges, a little above the foot, reach about two thirds along 

 the sides, commencing at the head. What appearance these 

 carinffi may present when the animal is living is uncertain ; 

 but doubtless they are much accentuated by contraction in 

 spirit. 



The concave back widens a trifle posteriorly and then 

 curves in to a terminal point. The foramen is situated in 

 the centre of this expansion, and from it radiate impressed 

 strife in all directions, and those which pass beyond or cut 

 across the marginal keels give them a scalloped appearance. 

 The entire surface is coarsely granular and covered with more 

 or less anastomosing impressed lines ; two, parallel to each 

 other and about a millimetre apart, run down tlie middle of 

 the back from end to end ; a single more or less distinct 

 line can also be noticed along each side between the keels. 

 All the tentacles are completely retracted beneath the skin, 

 and no genital opening behind the right one is observable. 

 Apparently there is no caudal pore. The foot is broad, lias a 

 distinct margin, and occupies almost tliree fourtlis of the 

 entire width of the animal. 



On cutting the skin near the dorsal opening a shell as thin 

 as paper was discovered. It was white, calcareous, and 

 broken up, but probably in life would be entire. 



