So nth- African Land-Mollusca. 471 



to be touiitl. Tlie jaw with radula complete was secured and 

 momiteil. 



The jaw has a small central jjrojection and tlie radula the 

 formula : 



4-00 . .2 . 12 . 1 . 12 . 2 . 60 + 

 + 74 . 1 . 74+. 



Genus ;>[ic'K()Ki:kkus (continued from p. 582, Part II.). 



Microkerkus fubiculjr. M. & P. (Part II., pi. xvi. figs. 2, 2a, 

 2 b, parts of animal.) 



K, rkojj/ionis fiisicolor, M. & P., Ann. S. A. Mus. p. 10^. 



Lora/ihj. Platberg, Harrismith, O.R.C. (received from 

 Connolly per H. C. Burnup) (No. 8). 



Aninial. — The right slicll-lobe somewhat broadly tongue- 

 shaped and short, left shell- lol)e small and tongue-shaped ; 

 left dorsal lobe in two parts, the posterior elongate and the 

 longest. Foot pale coloured, neck and tentacles grey, sole 

 of foot not divid.d, small lobe above the triangular-shaped 

 mucous pore, peripodial margin broad. Wall of the branchial 

 sac dusky black, mottled indistinctly with ivhite. The 

 kidney conspicuous by its pale ochraceous colour, which is 

 bordered with black above. The visceral sac beyond this is 

 whitish above and mottled black below. L()l)e above the 

 muct)us pore smdl, dorsal surface of foot flattened. 



Mr. Burnup writes: — ''A fine thing bearing a great 

 resemblance both in shell and animal (externally) to No. 4 

 {symmetricus, Craven), but on a larger scale." 



Ponsonhy, in letter Nov. 1907, says this species appears 

 as a Xatalina in the last monograph of the Rhytididte. 



The radula teeth are arranged 



60 . 8 . 14 . 1 . 14 . 3 . 60, or 87 . 1 . 87 in the row. 



Tiiey are like others described in s|iecics of the family. 



The marginals arc unevenly l)icuspid. 



Jaw witii a centi-al projection. 



In the genitalia the epiuhallus is long, the accessory gland 

 globose, on a short stalk. The spermathcca large aiul 

 svvollcn, on a thick stalk. Flagellum not attenuate. The 

 suermatophore : the ca|)sule is long and narrow, and the 

 flume bears spines (piite unlike any 1 have found in allied 

 species ; there are two main branches, growing from same 

 point close to the flume; from these, again, about eight 

 curved spines are given ott", gradually becoming shorter 

 towards the tip of the branch. 



There are 30 s[)ines on one side, none on the other (y^,). 



