Kirkpatrick — Hydroida and Polyzoa, Torres Straits. 623 



Stichoporina simplex, Koschinsky. 

 (PL xvii., fig. 4.) 



Stichoporina simplex, Koschinsky, Biyozoen alt Tertiar Siid- 

 Bayerns. Paleontographica (Zittel), xxxii. p. 64, Taf. VI. 

 figs. 4-7. 



Zoarium free, dome-shaped, concavo-convex, about 20 mm. in 

 diameter, by 4 mm. in height. 



Zooecia arranged in radiating lines ; the cells vertical in 

 position — the upper and lower surfaces of each varying from 

 rhomboidal to hexagonal. 



Orifice quadrangular, with a small articulating denticle on 

 each side. 



Above the orifice of each cell, an avicularium with avibraculoid 

 mandible. 



Dorsal surface resembling a mosaic, the lower convex surface 

 of each cell being visible. 



Ooecia large, depressed, dome-shaped, finely punctured. 



Opercula "26 mm. in length, by "20 in breadth. Opercula of 

 ooecial cells '22 in length by '24 in breadth. 



Habitat. — Murray Island, 15 to 20 fms. 



Distribution. — Recent. Cape of Good Hope and Malacca 

 (Belcher Collection, Brit. Mus. Coll.). Murray Island (Haddon). 



Fossil. — Grotzreuth, South Bavaria, Tertiary (Koschinsky) ; 

 Brendola, Colle Berici, N. Italy, and Eonzo, Tyrol ; Bartonian 

 (A. W. Waters, M.S.). 



I am indebted to Mr. A. W. Waters for pointing out that the 

 specimens from Murray Island belong to Koschinsky's species. 



The four specimens are broad and low ; those in the Belcher 

 Collection are much narrower in diameter, and more convex. In 

 external form, a fossil specimen of Mr. Waters', from Brendola, 

 more nearly resembles the latter. 



Stoliczka 1 observes that Stichoporina differs from Cupularia and 

 Lunulites in the irregular arrangement of the cells, which may be 



1 Stoliczka. Sitzungb. Math. Nat. Akad. Wiss. Wien. 1862. Bd. xlv. p. 92. 



