98 



2. FLABELLUM SIBOGAE. 



Desnwphylluin alabastriini, Alcock, Siboga Deep Sea Madre- 

 poraria, p. 28, pi. IV., figs. 5, 27, 27a (1902). 



There are two specimens of this very dehcate species, both 

 freed from their bases of attachment and somewhat chipped 

 They correspond in every particular with the form described by 

 Alcock from the East Indies as Desmofhylluni alabastrum, 

 which I have had to rename as the specific name, " alabaslrum," 

 was preoccupied by Moseley in the " Challenger Report." The 

 specimens measure 24 and 22 '5 mm. in height, and 9x7 and 8' 5 

 X 8' 5 mm. in diameter, across the mouths of the calicles. 



The form is certainly quite distinct from the other Cape of 

 Good Hope species, and so far as I can at present see, from all 

 other described species of the genus. In Duncan's system of 

 classification it would be referred to the genus Rhizotrochus. 



Locality. — Buffalo River, north of, 15 mi. Depth, 310 fms. 

 Nature of bottom, coral and mud. Date, April 24th, 1901. 

 (Two specimens.) 



3. FLABELLUM PAVONINUM (LESSON). 



Flabelliini pavoninum, Gardiner, Marine Investigations in 

 South Africa, Vol. II., p. 123, pi. IV., figs. 18-21 (1902). 



4. FLABELLUM RUBRUM (Q. et G.) 



F labellinn rubruni, Gardiner, Marine Investigations in South 

 Africa, Vol. II., p. 125, pis. I. -IV., figs. 1-17, 22-31 (1902). 



tl-enus SPHENOTROCHUS Ed. and H. 



Sfhenotrochus, Ed. and H., Cor. II., p. 65 (1857). 



The genus is one of the best defined and most isolated among 

 the TurbinoKdae. The polyp completely covers the whole of 

 the corallum, so that there can be no epitheca present. 



5. SPHENOTROCHUS GILCHRISTI, n. sp. (PI. I., 



fig- I. a— g). 



Corallum free, greatly compressed, rounded at the base with 

 no mark of any former attachment. 



The septa are 24 in number, and form two series. Cycles I. 

 a^id II. are equal in size, '75 — r5 mm. exsert in accordance with 

 the size of the whole corallum. The septa of cycle III. form 

 the second series, and are only about half as exsert as those of 



