572 Lt. -Colonel II. H. Godwin-Austen on 



The right shell-lobe (PI. III. fig. 1) is large and broad, the 

 left (fio;. 1 a) quadrate ; the two, when extended in life, must 

 cover the greater portion of the shell. The dorsal lobes are 

 well developed, and the left one is in two parts, the posterior 

 portion being small. The visceral sac is the same colour 

 throughout, sparsely mottled witii small black spots, over 

 the kidney there are a number close together forming a dark 

 band, seen through the shell. 



The generative organs (PI. XII. figs. 2, 2 a) are similar 

 to those of j-)k(edh7ius, M. & P., with this exception, the 

 vestibule is large, globose, solid, having thick walls, 

 externally with a rough warty surface, very conspicuous as 

 shown in fig. 2 ; when this is cut through and opened out 

 as in fig. 2 a, on the walls of the internal surface some four 

 strong, muscular, pillar-like folds are seen, not observed in 

 any other South African species I have as yet examined. 

 The free oviduct (ovitheca?) is intensely black, in strong 

 contrast to the rest of the generative organs. The penis has 

 an accessory gland near the retractor muscle ; the epiphallus 

 is very short, as in No. 3379 j^hcedimus (PI. V. fig. 3) and 

 poepingil, and the flagellum very long. The spermatheca is 

 a large j)ear-sliaped sac on a long solid duct. The formula 

 of the radula (PL XII. figs. 2 c~e) is 



60 . 1 . 15 . 1 . 15 . 1 . 60, or 76 . 1 . 7(3. 



The centre and admedian teeth are on large plates, the 

 latter with a cusp on the outside. The 16th tooth is transi- 

 tional with no cusp. The succeeding marginals are curved 

 and aculeate up to about the 65th tooth, when a slight notch 

 appears low down below the point on the outer side, rising- 

 higher ajid higher and at the same time lagerj the outermost 

 marginals (fig. 2 e) are unevenly bicuspid. The aculeate 

 form of the teeth (fig. 2d) in this species separates it well 

 from its congeners. The jaw (fig. 2 }>) is moderately curved, 

 with a central projection on the cutting-edge. 



Another species was received as IJeJicarion phcvdlmua, 

 ]\lelv. & Pons.; the specimens were beautifully preserved. 

 ]Mr. H. C. Burnup writes from Maritzburg, Natal, 21st March, 

 1908 :— 



" There is no doubt about this species being Ilelicarion 

 phcedimus, M. & P. ; we are quite familiar with the form, but 

 as there are so many of the old specis unknoivn, there is 

 always the possibility of the newer species having been 

 described before. Besides I do not know if it has been 

 satisfactorily ascertained that any of our so-called 7/t7/o(jr/"(>/j5 

 really belong to that genus." 



The species which have given me most trouble when 



