268 SIDNEY F. HARMEH. 



8. S. haddoiii, n. sp. Figs. 11, 38, 39. 



S. magnilabris, MacGilL, "Mon. Tert. Pol. Victoria," 

 ' Trans. Roy. Soc. Vict.,' iv, 1895, p. 53, pi. vi, figs. 14 — 16. 



B zooecia about twice as large as the a zocBcia. Crypto- 

 cyst descending gradually and slightly, without angulation, 

 joining the distal wall rather high up. Median process 

 wide,^ its distal border usually without pointed angles, its 

 cavity not very deep, the roof of the tube forming its distal 

 boundary rather than its floor. Opening of tube oblique, 

 clearly visible from above ; that of a zooecia usually com- 

 pleted by the distal wall, that of B zooecia entirely sur- 

 rounded by the cryptocyst. b zooecia with an enormous oral 

 shelf; their opercula usually longer than broad, the halves of 

 the main sclerite being close together and parallel for a con- 

 siderable distance distally, so that the sclerite is A -shaped 

 rather than A-shaped ; subraarginal teeth fine, recurved, 

 limited to the distal half of the operculum, a zooecia small ; 



ral shelf evanescent or narrow ; their opercula undiffer- 



ntiated. 

 (a) Torres Straits, Haddon Coll. (C. M., 24.2.98). 

 (6) Port Darwin, N.W. Australia, H.M.S. ''Alert" (B. M. 

 82.2.23, 512). 



(c) Australia, Dr. J. E. Gray (B. M.). 



(d) Australia (B. M.). 



(e) Australia (B. M., 62.6.5, 18). 



(/) Australia, Busk Coll. (B. M., 62.6.5, 18) ; marked by 

 Mr. Busk " S. magnilabris, var." 



[Various localities, Victoria (Tertiary), MacGillivray.] 

 MacGillivray, who describes this form as a Tertiary fossil, 

 appears to be the only author who has noticed it. He 

 describes the b zooecia as having a shelf, which is seen from 

 his fig. 14 a to be large, and to form a distinct ogee arch. 

 The a zooecia have no shelf, or in some specimens a narrow 

 shelf. One specimen had a conical process on the back of 

 ' Not so wide ill b zooecia, see p. 2G7. 



