130 Lt.-Colonel II. II. Godwin-Austen on 



I also compaveci the six specimens of tliis species in tlie 

 McAndrew collection, Cambrldj^e, kindly sent to me by 

 Mr, L. Doncaster, to whom my best thanks are due. Four 

 of tliese show ruddiness in the suture. The perforation is 

 exceedingly minute, as Benson describes. Looking at the 

 so-called fiudsonice sent me by Ponsonby and Burnup from 

 Port Elizabeth and Grahamstown, perforation is not apparent ; 

 the shells, too, are darker and far more solid in structure than 

 the typical form. I am therefore disposed to consider that 

 true //. hudsom'ce is confined to tlie area around Swellendaui. 

 The four specimens under this name in the Natural History 

 Museum collection from Algoa Bay show minute perforation, 

 but differ from the typical shells in being larger, 13^ mm. 

 in major diameter. 



Only a compaiison of the animals of hudsonite from the 

 original liabitat, with those I have mentioned from the 

 country further east, can conclusively solve what degree of 

 diflference there may be in the animals ; judging from those 

 I have dissected from the western side, it will not be very 

 great. 



PeUatus ahicoJa, M. & P., var. (PI. IV. figs. 1, 1 a, 1 h.) 



Locality. Grahamstown [J. Farquhar). 



The animal : the foot is indistinctly divided. 



Tiie lobe over the mucous gland is quite small (PI. IV. 

 fig. la). 



Both right and lett shell-lobes are small and narrow 

 (PI. IV. figs. 1 & la). 



The visceral sac is much mottled with a ground-colour of 

 ])ale ochraceous, but milky white is the predominant colour. 

 There is a narrow border of black on the mantle-edge in 

 front : the branchial sac up to the kidney (k) is broadly 

 streaked with white ; this organ is bordered by a narrow bar 

 of black, sharply edged with white, thence to the apex there 

 are large blotchings of white with a ^qw small spots of same 

 colour mixed with them. I have examined some eight 

 specimens; the bar of black is a conspicuous feature, showing 

 through ^ho shell. 



Uenerative organs (PI. IV. fig. 1 /')• — Ihe penis-sheath is 

 doubled on itself in close S-form, the retractor muscle is given 

 off just above it ; the epiphallus is fairly long, with a short 

 ca'cum-like accessory gland about midway. Flagelhnu 

 short and pointed. Spermatheca globose on a thick stalk. 



Kadula formula : 46 . 2 . 1-1 . 1 . 1-i . 2 . 4G, or 62 . 1 . Ci. 



Juw with a central projection. 



