1901.] ON THE ANATOMY OF COGTA BBEVICEPS. 107 



Plate VI. 



Figs. 1, 2, & 3. Cerebratulus grecnlandicus (p. 99). Sections through cerebral 

 oi'gan and neighbouring parts, taken at intervals of about 50 f.i. X 45. 



Fig. 4. Brcpanophorus borealis (p. 95). Section through rhyuehoccelomic diver- 

 ticulum at the point where it gives off an expansion. Enlarged view 

 of * in test -fig. 3, p. 98. X 85. 



The minute structure of the cerebral organ is not shown. 



5. D. borealis. Section through a gonad. X 45. 



6. Amphiporus thompsoni (p. 97). Dorsal view of anterior end. X f . 



7. D. borealis. Dorsal view of anterior end. X 1. 



Plate VII. 



Fig. 8. Amphiporus thompsoni. Schematic i"econstruction of anterior end, 

 showing the relations of the various systems. The alimentary canal, 

 proboscis, and its sheath are omitted. The vascular system is more 

 arched than shown here (cf. text-fig. 1, p. 91). X 10. 

 9. A. arcticus (p. 94). Similar to fig. 8. X 10. 



10. Cerebratulus grecnlandicus. Similar to fig. 8. X 5. 



11. A. paulinus. Transverse section through oesophagus, just before the 



first appearance of the blind gut. X 45. 



12. C. greenlandicus. Section through skin of oesophageal region. X 85. 



13. J), borealis. Very young stage of ovum. X 410. 



14. D. borealis. Slightly later stage than fig. 13. The functional ovum 



has become surrounded by several primitive ova, in one of which the 

 nucleus and its contained nucleolus are seen, whilst in others the large 

 nucleolus alone can be made out as a deeply staining body. X 410. 



15. D. borealis. Older ovum, in which the greater part is surrounded by 



waterspout follicle-cells. At the lower pole the follicle-cells and the 

 outer surface of the ovum are forming the egg-coverings. X 85. 



16. B. borealis. Enlarged view of a few follicle-cells from the ovum shown 



in preceding figure. X 410. 



17. D. borealis. Portion of the outer wall of a neaily ripe ovum, showing 



the two coverings of the egg enclosing the yolk {y). X 410. 



3. On the Anatomy of Cogia breviceps. By W. Blaxland 

 Benham, M.A., D.Sc, F.Z.S., Professor of Biology in 

 the University of Otago, New Zealand. 



[Received April 30, 1901.] 



(Plates VIII.-XI. l ) 



(Text-figures 7 & 8.) 



Atthe end of August, 1900, 1 received information thata"young 

 Sperm-Whale '' had come ashore at Parakauui, a spot about 

 12 miles north-east of llum-din. Next morning, accompanied by 

 the museum taxidermist, I went down by train to the spot, where 

 1 ascertained that the whale had been thrown ashore just a week 

 previously. We found the can-as.' al about high-water mark, 

 nearly entirely covered by sand, which had preserved the animal 

 from decomposition, bo that the carcase did not present the 

 unpleasant odour usual to deceased whales. Unfortunately, how- 

 ever, the animal had been much cut about ; but 1 at once saw that 



I for explanation oi the Plates, see p. L82. 



