466 AI.BATKOSS PTEROPOUS AND HETEROPODS PECK. 



Explanation of Plate LIII. 



Plate I is an outline tracing of a Mcrcaior projection map of South America, with 

 a part of North America, illuHtrating the c()m\sc of the Jlbatrosa south from Norfolk. 

 The line of dredging stations, where ])tero])od» and heteropods were taken, bears 

 the numbers 27.50-2763 according to the records of the steamer. So also the surface 

 collecting stations where these molluscs were taken are likewise numbered 1-31. 



Plate LIV. 



All the outlines are drawn to the same scale — live times enlarged — with an embryo- 

 graph, a ventral, h lateral, c front view, in each case. 

 Fig. 1. Cavolinia trisjyinosa. 



2. Cavolinia qnadridentatu. 



3. Cavolinia utieinaia. 



4. Cavolinia (jihhosa. 



5. Cavolinia iridiniata. 



6. Cavolinia lotif/irostris. 



7. Cavolinia inflexa. 



8. Limaciua infiata. 



Plate LV. 



Letters as before. 



Fig. 9. Clio (Creseis) rirrjuJa. 



10. The same, variation corniformis. 



11. Clio (Creseis) conica. 



12. Clio (Styliola) siihulata. 



13. Clio (Hyalocylix) fttriata. 



14. Clio (s. str.) haUmliion. 



15. Clio (s. air.) pyramidata. 



16. Cuvierina columella. 



