416 Annals of the South African Museum. 



on both sides of what was the primary rod; these holes differ greatly 

 in size and shape and are not infrequently divided transversely in 

 two ; scarcely two of the plates are exactly alike. These deposits are 

 unlike those of any species of Thyune, of which I know, and taken 

 in connection with the wide calcareous ring, made up of many 

 pieces and having long radial, posterior prolongations, and with the 

 presence of well-marked anal teeth, they make the species easy to 

 recognize. Since Quoy and Gaimard say their HolotJturia aurea was 

 found "parmi les racines de fucus de la rade du Cap de Bonne- 

 Esperance", the habits and habitat of the Thyone at hand point 

 strongly to aurea. The difference in colour, I think, may be due to 

 the fact that all of the specimens at hand, of which the colour is 

 given, were washed up on the beach and were very probably dead 

 specimens from which most of the orange-red colour of the living 

 animal had been washed out. 



P.F. 15967. Zwartklip N.E. Vi N., 1 mile, 10 fms. Brk. sh. 

 17, XI, '02. 1 specimen; adult. 



P.F. 16365. False Bay: Fish Hook Bay, 5 fms. Fne. s. 24, XII, '02. 

 5 specimens ; adult and young. 



Table Bay: Mouille Point, amongst roots of laminaria, washed up 

 on beach. Colour pink. June, 1912. Dr. L. Peringuey. 2 specimens; 

 adult. 



Table Bay: Woodstock Beach. July, 1915. K. H. Barnard. Pale 

 pink. 15 specimens; small adults and young in very poor condition. 



* PENTACTA DOLIOLUM. 



Actinia doliulum Pallas, 1766. Misc. Zool., p. 152; pi. XI, figs. 10 12. 

 Pentacta duliolum Goldfuss, 1820. Handbuch der Zoologie, pt. 1, p. 177. 

 Colochirus doliolum von Marenzeller, 1874. Verh. zool.-bot. Gesell. 



Wien, vol. XXIV, p. 303. 



It is a matter of great regret to me that the collection from the 

 South African Museum contains no specimen which I can refer to 

 this species, originally described from the Cape of Good Hope and 

 in 1887 recorded by Ludwig from Angra Pequena Bay. It is a 

 curious fact that the species was not taken by the CHALLENGER at 

 the Cape nor by Schultze at Angra Pequena, while species of Cucu- 

 maria taken by those parties at those places, and also represented in 

 the present collection, have calcareous particles of the same general 

 type as those which Ludwig describes for his specimens from Angra 

 Pequena. The line of separation between Cucumaria and Pentacta 

 needs further elucidation. 



