224 Hanna — Notes on Pribilof Islands. 



14. Stepanopyxis appendiculata Ehrenberg. — Two specimens. 



15. Stepanopyxis grunowii var. inervis. — Very abundant and spines absent 



on the valves. 



16. Coscinodiscus pustulatus Mann. — The abundance of this diatom char- 



acterizes the deposit. It is excessively variable, only the more per- 

 fect examples approaching the original figure. Valves are dissimilar 

 in shape, one being a section of a sphere while the other is a 

 rounded cone. The species has heretofore been found but once, 

 and then in deep water in Bering Sea. 



17. Coscinodiscus decrescens Grunow. — Two specimens only. 



18. Coscinodiscus undulosus Mann. — One specimen of this remarkable diatom 



was found. 



19. Coscinodiscus tuberculatum Greville. — A very abundant and variable 



diatom. 



20. Coscinodiscus subtilus Ehrenberg. — Two coarse examples. 



21. Coscinodiscus radiatus Ehrenberg. — Very common and variable in size. 



22. Coscinodiscus marginatus Ehrenberg. — Abundant and variable in size. 



23. Coscinodiscus fimbriatus-limbatus Ehrenberg. — One specimen, 



24. Coscinodiscus cxcentricus Ehrenberg. — One specimen. 



25. Coscinodiscus, new species. — Four specimens of an undescribed species 



probably belonging to this genus were found. The markings are so 

 remarkable that Dr. Mann could not say with certainty that it was 

 not a Melosira. 



