SYSTEMATIC ACCOUNT 27 



26. Proteonina tubulata (Rhumbler) (SG 64) (A 86) (Plate I, fig. 6). 

 Two stations: 303, 422. 



Three excellent specimens at St. 303, and one at St. 422. 



Genus Tholosina, Rhumbler, 1895 



27. Tholosina bulla (Brady) (F 65) (SG 67) (A 94). 



Two stations: 313, 43<8. 



One good specimen at St. 313 ; represented only by "scars" on sand grains at St. 438. 

 Pearcey: 420 "several specimens attached to Rhabdammina, etc." 



28. Tholosina vesicularis (Brady) (F 67) (SG 69) (A 97). 

 One station: 313. 



A single specimen. 



Genus Thurammina, Brady, 1879 



29. Thurammina papillata, Brady (SG 72) (A 99). 

 Three stations: 2S0, 313, 417. 



Single specimens at Sts. 280, 417; many large individuals at St. 313, presenting great 

 contrast in the relative proportions of sand and cement, some being quite smooth and 

 formed almost entirely of cement, while others are roughly sandy. 



Pearcey: 291, 420 "rarely". 



30. Thurammina corrugata, sp.n. (Plate I, figs. 10, 11). 

 Two stations: 313, 417. 



A young individual at St. 313 ; fragments of one or more large specimens at St. 417. 



Test approximately spherical, darkly ferruginous in colour; wall composed of very 

 minute sand grains and ferruginous cement, extremely thin and crinkled all over, the 

 inner surface duplicating the exterior — what are raised ridges exteriorly are depressed 

 troughs interiorly, and vice versa. Apertures minute but numerous, scarcely produced 

 above the surface of the external corrugations, rarely distinguishable on the inner side. 

 They are more conspicuous but fewer in the young shell. Test very fragile in the dry 

 condition, but probably flexible in life. 



T. corrugata is, I think, unique in its genus in its wall characters. It is so uniformly 

 thin that the external corrugations are exactly duplicated internally. The cavity of 

 Thiiramrnina is normally smooth, except for slight pits corresponding to the external 

 apertures, even in such strongly decorated species as T. favosa. 



I was at first inclined to associate my specimens with Thurammina favosa, var. 

 reticulata, Pearcey (SNA, p. 1003, pi. i, figs. 11, 12), found by him "in moderate num- 

 bers " at St. 420. Pearcey's description is vague, the first paragraph would describe any 

 form of T. papillata. In the second paragraph he describes the exterior as " marked by 

 an irregular network of raised ridges which easily distinguish this form from the type 

 T. favosa, Flint; the ridges are robust and irregular, of a much lighter colour than that 



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