70'1 MESSRS. E. HEEON-ALLEN AND A. EARLAND ON THE 



373. DiscorMna corrugata Millett. 



Discorbiiia corrugata Millett, 1898, etc., ¥M.. 1903, p. 703, pi. vii. fig. 5. 



1 Station. 



At Stn. ■? X a few specimens were found which, in their deeply indented contour and 

 angular faces, appear to be referable to Millett's species, but they differ from his 

 figure in the fact that the sutural lines are visible all over the shell. They thus form 

 a connecting-link between Millett's type and either I), patelliformis or D. taherna- 

 Gularis, to which he admits that JD. corrugata is closely allied. In the Kerimba 

 specimens the ridges mark the centres of the chambers, the juncture of the sutural 

 lines lying in the depressions between them as observed by Millett. We have 

 typical specimens from shore-sands at Eottnest Island, West Australia, and Sandoway, 

 Arakan Coast, Burmah. 



374. Biscorbina tabernaciilaris Brady. 



Discorbina tabemacidaris Brady, 1879, etc., RRC. 1881, p. 65. 



Brady, 1881., FC. p. 618, pi. Ixxxix. figs. 5-7. 

 Egger, 1893, FG. p. 390, pi. xv. figs. 58-60, 79. 

 „ Millett, 1898, etc., FM. 1903, p. 700. 



„ „ Sidebottom, 1910, RFBP, p. 35, pi. iii. fig. 12. 



15 Stations. 



The species is less widely distributed than the allied form D . ])atelliformis, but at 

 the Stns. where it occurs is often extremely abundant and presenting great variation. 

 Most of the individuals have the surface of the cone much more corrugated than 

 Brady figures it, and the apex is generally more acute, often terminating in a sharp 

 point. The best individuals were at Stns. 1 and 11. At Stn. 2 a it was common and 

 strongly costate, some individuals less conical than usual and hardly distinguishable 

 from D. patelliformis. At Stns. 4, 5, 8, and 10 the specimens were rare and poorly 

 developed. At Stn. 11 the species is abundant and splendidly developed, the 

 individuals being separable into two groups, the larger very closely approaching 

 I), fatelliformis but strongly corrugated, the smaller being normal D. tahernacularis, 

 but with the sutural lines strongly limbate in most of the individuals, as in Brady's 

 fig. 7. Double (or budding) specimens were found at Stns. 3 and 11. 



375. Discorbina erecta Sidebottom. 



Discorbina erecta Sidebottom, 1901., etc. RFD. 1908, p. 16, pi. v. figs. 6, 7. 



6 Stations. 



Occasional specimens only of this rather distinctive type, the best and most typical 

 being from Stns. 12 and "? X, at the latter Stn. relatively most abundant. At Stn. 2 

 the specimens passed into D. tahernacularis by suppression of the sutural lines and 



