6 BOTHR1EMBRYON. 



below the suture and on the spire. Whorls 5^- (B. nielo Reeve, 

 Conch. Icon. pi. 39, f. 243, is this form). 



Alt. 28, diam. 17, longest axis of aperture 16.5 mill. 



Alt. 31.5, diam. 19, longest axis of aperture 18 mill. 



King George Sound. 



Figure 13 is from a specimen in coll. Dr. J. C. Cox. 



Fig. 14 represents a very solid, cretaceous form with conspicuous 

 subsutural granulation and purplish aperture, the exterior mainly 

 white. Alt. 23, diam. 15, longest axis of aperture 14 mm. It is 

 from Dr. Cox's collection, precise locality not known. 

 Var. CONISPIRA, n. v. PI. 1, figs. 15, 16, 17. 



Length 22 to 25 mill.; last whorl wide ; spire more conic ; densely 

 marked with opaque white or yellow striae on a reddish-brown or pale 

 amber ground, often with an ill-defined light belt above ; the aperture 

 purplish-fleshy or somewhat ochraceous within. Surface distinctly 

 striated, conspicuously granose below the suture, which is more or less 

 conspicuously marginate. Apex with more elevated whorls than B. 

 inflatus or the preceding varieties, distinctly reticulated throughout, 

 the pits of the net- work arranged in more or less distinct vertical 

 rows ; an abrupt change of sculpture at inception of the post-nepionic 

 stage (pi. 4, fig. 71). 



Alt. 25, diam. 14.5, longest axis aperture 13 mill. 



King George Sound. 



Fig. 17 shows a form in which there is a very broad light zone 

 extending from the periphery to near the umbilicus. Fig. 15 is an 

 albino, with white aperture. 



The difference in the nepionic sculpture between this form and B. 

 inflatus is considerable, the present variety more nearly resembling 

 B. dux in this respect. 



B. SPENCERI (Tate). PI. 1, figs. 19, 20. 



Shell narrowly perforate, broadly ovate, thin and not strong, 

 chestnut brown lightening in places to yellowish, uniform except for 

 some inconspicuous darker streaks. Surface shining, sculptured 

 with low, irregular growth wrinkles, which near the suture and on 

 the spire are cut into granules by spiral incised lines. Spire very 

 short, the apex obtuse, somewhat involute at the tip ; nepionic 1^ 

 whorls delicately sculptured with "oblique, slightly raised, wavy 

 threads, narrower than the interspaces," and running vertically (pi. 



