A Revision of the Genus Auliscm Ehrh., &c. By J. Battray. 879 



A. raeanus sp. n. 



Eoundly elliptical, major axis 0'15 mm., about 1^ times minor. 

 Surface rising gradually from centre, steeply from border to processes ; 

 transverse median areas oblique to line joining processes, flat on 

 central portion, with, outer ends indistinct, broader, rounded, and close 

 to the border. Colour pale grey. Central space elliptical, major axis 

 corresponding in direction with axis of transverse area, 0'0175 mm. 

 long, about 2\ times minor. Markings punctate and irregular around 

 the central space ; striae delicate, flexuous around the processes and at 

 middle of outer portion of transverse areas, straight between outer 

 ends of latter and the nearer process, elsewhere slightly convex 

 towards the process near the border. Processes 2, elliptical, 

 0*03 mm. broad, delicate parallel closely placed striae contiguous to 

 the markings on their central side. — PL XII. fig. 3. 



Habitat : Oamaru deposit (Rae !). 



A. Biddul])hia Kitton, Sch. Atl., pi. Ixvii. fig. 3. 



Elliptical, major axis ■ 125 mm., about 1^ times minor. Surface 

 with obcordate areas between central space and processes well defined, 

 transverse median areas less prominent, widening greatly outwards, 

 with outer angles rounded, the ends close to the border, slightly 

 convex. Colour pale grey. Central space with the angles but 

 slightly protuberant, 0"0175 mm. broad. Markings minute, punctate, 

 delicate striae, only visible about outer edges of obcordate and trans- 

 verse areas. Processes 2, large, the sides towards the base concave, 

 the ends convex. 



Habitat : Santa Monica deposit (Weissflog ! Kitton ! Cleve). 



Var. prominens. 



A. Biddulphia var., Sch. Atl., pi. Ixxxix. fig. 2. 



Major axis from 0'1325 to 0"16 mm., from 1^ to 1\ times minor. 

 Surface with obcordate and transverse areas more evident, outer ends 

 of the latter narrower and farther from border. Markings punctate, 

 more evident, the striae converging to the processes and diverging 

 around outer ends of transverse area distinct, large blunt apiculi 

 prominent between transverse and obcordate areas. 



Habitat: Santa Monica deposit (Rae! Weissflog! Hardman! 

 Firth !). 



Var. dentata. 



A. Biddulphia var.? Grun., Sch. Atl., pi. Ixxxix. fig. 3. 



Surface with obcordate and transverse areas indistinct. Markings 

 delicate striae converging to processes and around border, sometimes 

 also passing obliquely inwards from edges of transverse areas ; apiculi 

 prominent at outer ends of transverse areas, elsewhere smaller and 

 less distinct. Processes more rounded. 



Habitat : Santa Monica deposit (Schmidt). 



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