BY C. HEDLEY. 533 



first cusp small followed by a large cusp, which is again succeeded 

 by about four or five small cusps in a diminishing series. Below 

 these there is a prominent truncated lobe reaching slightly below 

 the level of the rachidian. Both uncini are curved and carry 

 four cusps." 



Egg-cluster of Purpqra succincta Martyn. 



(Plate xxxiii., figs 31, 32.) 



During an excursion of the Field Naturalists Club, on 30th Sept. 

 1905, several specimens of Purpura succincta were observed in 

 the act of depositing masses of ova round the trunks of the 

 Ascidian, Cynthia prceputialis, at low tide mark on Wyargine 

 Point, Middle Harbour. 



As no account of these has appeared in literature, I give an 

 enlarged view of a single unhatched capsule, and a sketch of a 

 small cluster. Most capsules were a pale cream colour, but some 

 were stained with purple. Each stood erect on a common mem- 

 brane; the height of each was about 9 mm. and the longest 

 diameter about 6 mm. When tightly packed the summits were 

 rhomboidal, but oblong when separate, flat, surrounded by a 

 rim which is often emarginate on one side. Across the major 

 diameter is a streak and near the centre a clear spot which 

 appears at first sight to be a perforation. 



The egg-capsule of an unknown mollusc from Tranquebar, 

 figured by Lund,* has a great resemblance to that now illustrated. 



According to the description and figures of C. W. Peach, f the 

 capsules of Purpura lapillus differ by being stalked and by 

 having a caducous operculum. 



The young shell, dentition and operculum have already been 

 figured in these Proceedings, t 



* Ann. Sci. Nat. (2), i. Zool. 1834, p.99, pl.vi., f.2. 

 t Ann. Mag. Nat. Hist. xi. 1843, p.28, pi. i., a. f.1-3. 

 : Vol. xxvi. 1902, p.538, pi. xxix., f.l, 6, 8. 

 35 



