51 PROCEEDINGS OF THE MALACOLOGICAL SOCIETV. 



Tethys Buknupi, n.sp. 

 Of this species (Fig. 5), which I have taken the liberty to name after 

 Mr. Burnnp, there was one specimen only, from Durban. It had the 

 following measurements : total length, 42 mm. ; greatest breadth, 

 15 mm.; distance from the mouth to the anterior end of the 

 parapodia, 11mm. ; length of the parapodia, 30 mm,; greatest depth 

 of parapodia, 9 mm. ; distance from anterior end of the parapodia to 

 the rhinophores, 3 mm. ; distance between the anterior ends of the 

 parapodia, 6 mm. ; breadth of foot, 7 mm. 



The animal has an oval form, with very long but not particularly 

 deep parapodia. The latter unite where they meet the foot at a 

 point only 1 mm. from its extremity. 



Tlie mantle is large ; its anterior limit nearly coincides with the 

 mid transverse plane of the animal. The shell-sac is completely 

 closed, without any indication of the position where the opening 

 should be. The siphon is small. 



The rhinophores, which lie remarkably close in front of the 

 parapodia, are short, cylindrical, and blunt ; their apices are excavated, 

 the border of the hollow being irregular. The anterior tentacles, 

 which are formed by foldings of the buccal lobes, are large and flat, 

 and, together with the buccal lobes, project laterally in the horizontal 

 plane. 



The genital opening lies on a level with the anterior limit of the 

 mantle, 3 mm. in front of the gill. The opaline gland opens by 

 numerous minute pores. The anus is in the usual position within the 

 siphon. 



The genital groove has the normal position and appearance. The 

 eyes lie 1 mm. in front of the rhinophores. 



In colour the animal is dusky grey green, flecked with small 

 elongated blotches of whitish green, directed for the most part 

 longitudinally. The inner surface of the parapodia is dusky green, 

 marked near the margin by radially disposed patches of whitish green. 

 The mantle is for the most part transparent, but clouded along its left 

 side and around the siphon- with dusky green. 



