112 Annals of the South African Museum. 



which appears to represent the spermatheca. If this interpretation 

 is ultimately found to be correct the spermatozoa must be carried 

 down the common duct to the vagina where they are separated 

 from the ova and ultimately find their way to the exterior after 

 traversing part of the spermathecal duct. 



It remains to make one or two disconnected observations upon 

 isolated points of anatomy. 



[a) Portions of the resorbed shell septa are found in a superficial 

 position in various parts of the body enclosed in epithelial pockets. 



[h) The anterior edge of the mantle is supplied on the right-hand 

 side with hard semi-calcified pads which no doubt act as protection 

 against the rather formidable teeth of the shell aperture. The anus 

 opens in a groove in one of these pads. 



(c) The animal is apparently omnivorous, as the lower part of the 

 intestine contained a variety of foraminiferan skeletons together with 

 sand granules and fragments of a red crystalline substance. 



Hah. Inaccessible Island, Tristan d'Acunha (Keytel (Type) 

 and others). Gough Island (Scotia Expedition, fide Melvill & 

 Standen). South Africa. Camps Bay (Dale ; McBean) ; Dassen 

 Island (Lightfoot). 



Type in South African Museum. 



This species has long been known in collections under the name 

 of Marinula nigra (Phil.), but as the last is merely a synonym of 

 M. j)C2nta, from Chiloe, a new name is necessary for the Tristan 

 form. 



The shell very closely resembles that of j;c^ito, but the early 

 whorls are rather less convex and the small columellar fold is, on 

 the average, slightly more pronounced than in King's species, which, 

 from its widely different locality, should surely be distinct. 



I have not seen the examples mentioned by Melvill & Standen, 

 but have no reason to doubt their identity with trista7iensis, while 

 their appearance on Gough Island furnishes a stepping-stone 

 between Tristan d'Acunha and South Africa. 



Only three specimens of Marinula, probably referable to tristan- 

 ensis, have so far been collected in the last-mentioned sub- 

 continent. Two of these, picked up at Camps Bay, near Cape 

 Town, are somewhat beach-rolled, while the third, taken alive 

 below high-water mark on the rocky shore of Dassen Island, is so 



