2 /. W. Bailey on Microscopic Forms in the Sea of Kamtschatka. 



*Coscinodiscus eccentricua Ehr. Gyrosigma ? 



* lineatus Ehr. Rnizosolenia hebetata B., fig. 18, 19. 



" Oculus Iridis Ehr. Syndendrium Diadema, several varieties. 



" subtilis Ehr. Pinnularia peregrina Ehr. 



*Cyclotella pertenuis B. Synedra ? 



Denticula ? lauta B. Triceratium. ? 



Infusoria, Rhizofoda? 

 *Cadium marinum B., fig. 2. Difllugia ? marina B., fig. T; 



PoLYCISTINEA^E. 



*Ceratospyris ? borealis B., fig. 3. *Halicalyptra ? cornuta B., fig. 13, 14. 



Cornutella clathrata 3 profunda *Haliomma ? pyriformis B. f fig. 29. 



Ehr., fig. 23. *Lithobotrys inflatum B., fig. 15. 



*Cornutella annulata B., fig. 5, a,b. *Perichlamidium venustum B., fig. 16, 11. 



*Dictyophimus ? gracilipes B., fig. 8. *Stylodictya stellata B., fig. 20. 



*Eucyrtidium aquilonaris B., fig. 9. *Eucyrtidium hyperboreum B., fig. 10. 

 " cuspidatum B., fig. 12. " turgidulum B., fig. 11. 



ZOOLITHARIA* 



Spongolithis acicularis Ehr. *Spongolithis clavata B. fig. 21. 



" aspera Ehr. " uncinata Ehr. 



" clavus Ehr. * " orthogona B., fig. 22. 



POLYTHALAMIA. 



N"ot even a fragment of any of the Polythalamia has been detected by me in 

 these soundings. 



Description of the new species referred to in the above list. 



Asteromphalus Broohei B. Plate I, fig. 1. Discs slightly con- 

 vex; umbilical rays (7 to 13 or more), flexuose, some simple 

 others branched, or two or more uniting before reaching the 

 centre. 



Diameterf 2 m to 4 m , (='002" to 004"). 



This is a very beautiful species which I take pleasure in dedi- 

 cating to Lieut. Brooke of the U. S. Navy, who by means of his 

 ingenious device for obtaining deep sea bottoms, has added this 

 and many other interesting forms to the treasures of the micro- 

 scopist. This species appears to be distinguished from any of the 

 Antarctic species described by Ehrenberg, by the branched char- 

 acter of a portion of its umbilical rays. The number of rays in 

 my specimens varies from seven to thirteen, but specimens differ- 

 ing in the number of rays agree so closely in every other charac- 

 ter that I do not believe that the number of rays is a character of 

 specific importance in this genus, and the same remark will apply 

 to the allied forms of Asterolampra, Heliopelta, Actinoptychus, 

 Actinocyclus, &c. 



The genus Asteromphalus may reach its maximum in the 

 polar seas, having been found by Ehrenberg to exist in great 



* Ehrenberg refers the silicious spiculae of sponges to Phytolitharia, but the 

 animal nature of sponges now appears to be generally admitted. 



f The micro-unit which I employ is T .gVTJ tn °^ an English inch, and I express 

 the dimensions in integers and fractions of this unit, thus 3£ w =-00325 // . 



