6 Annals of the South African Museum. 



ventral wall of the sperm-duct (plate II., fig. 16, v.cl.), at the point 

 where it makes a turn backwards. Immediately beneath the vagina 

 it becomes much larger and convoluted. The receptaculum seminis 

 has a very short duct, the body itself being , somewhat pyriform. 

 The free-oviduct is short and of about equal circumference through- 

 out. The oviducal portion of the common duct is densely folded and 

 short. There is a large albumen gland. The hermaphrodite gland 

 is a small, somewhat triangular-shaped body with a long fine duct. 



OOPELTA FLAVESCENS, n. sp., 



Plate I., figs. 9-10 ; Plate II., fig. 17. 



Anivial cream-coloured with a slight bluish-green tint on the 

 posterior portion of mantle. Granulations on mantle prominent, 

 also on rugae. Oblique, backwardly directed furrows as in preceding 

 species. No trace of a keel. Eugse small. Peripodial groove 

 distinct. Foot-fringe and foot-sole almost white, no lineoles or 

 divisions into median and lateral planes. Length (in alcohol) 51 

 mm. ; mantle, 22 mm. 



Hah. Kalk Bay. F. Purcell, 1896. Four specimens, in collection 

 of South African Museum. 



Generative Organs. This species differs from 0. nigropunctata, 

 Morch, in not a few important particulars. The vagina is larger 

 than in this last-mentioned species. The sperm-duct is somewhat 

 sickle-shaped (plate II., fig. 17, sp. d.) ; distally it much resembles the 

 previous species. The retractor muscle is longer and broader, parti- 

 cularly at its point of origin. The vas deferens is a long fine tube 

 opening into the distal end of the sperm-duct (plate II., fig. 17, v.cl.) 

 and lying close to the under side of that organ and on the under side of 

 the vagina ; the portion which lies to the left of the vagina is much 

 wider, the width increasing as it approaches the prostatic portion of 

 the common duct (plate II., fig. 17). The duct of the receptaculum 

 seminis is about the same length as the body, which is oval in shape. 

 The free-oviduct is much longer than in 0. nigropunctata, and it 

 gradually becomes wider as it passes backwards. There is a large 

 albumen gland and a densely convoluted hermaphrodite duct with a 

 bilobed hermaphrodite gland (plate II., fig. 17, h. gl.). 



OoPELTA GRANULOSA, n. Sp,, 



Plate I., figs. 11-12 ; Plate II., fig. 18. 

 Animal brownish-yellow, head and sides of the body anteriorly 

 bluish ; granulations on the mantle very pronounced ; oblique, 



