EXPLANATION OF PLATE 18 (XVIII) 



Figs. 1, X 20; Figs. 2-8, X 40; Figs. 9-17, X 15; Figs. 18, 19, X 20. 

 Figures 1, 5-8. — Psammosphaera fusca Schulze. 



Fig. 1. Porcupine Sta. 16, W. of Ireland, E. Atlantic. (?) 

 Figs. 5, 8. Challenger Sta. 323, South Atlantic. (1900 fathoms) 

 Fig. 6. Challenger Sta. 23, West Indies. (450 fathoms) 

 Fig. 7. Challenger Sta. 122, S.E. of Pernambuco, Atlantic. (350 fathoms) 

 Figures 2-4. — Psammosphaera parva Flint. 



Figs. 2, 3. Challenger Sta. 286, South Pacific. (2335 fathoms) 

 Fig. 4. Challenger Sta. 122, S.E. of Pernambuco, Atlantic. (350 fathoms) 

 Referred by Brady to P. fusca Schulze and by Cushman (U.S.N. M. Bull. 71, Pt. 1, 1910, p. 36) to P. parva 

 Flint. Flint (Rept. of U.S.N.M. for 1897, 1899, p. 268) noted that his species was included in P. fusca by Brady 

 but did not refer to Brady's figures. 

 Figures 9, 10. — Sorosphaera confusa Brady. 



Fig. 9. Porcupine Sta. 23, N.W. of Ireland, E. Atlantic. (650 fathoms) 

 Fig. 10. Challenger Sta. 76, off the Azores, Atlantic. (900 fathoms) 

 Figures 11-15, 17. — Saccammina sphaerica M. Sars. 

 Figs. 11, 13. North Atlantic, deep water. 

 Fig. 15. Hardanger Fiord, Norway. (400-500 fathoms) 



Fig. 17. Challenger Sta. 149D, Kerguelen Islands, S. Pacific. (20-60 fathoms) 

 Figure 16. — Saccammina sphaerica Sars var. catenulata Cushman. 



Porcupine Sta. 23, N.W. of Ireland, E. Atlantic. (630 fathoms) 

 Referred by Brady to 5. sphaerica M. Sars, and by Cushman (Proc. U.S.N.M., Vol. 51, No. 2172, p. 652) 

 to 5. sphaerica var. catenulata (described by Cushman from the Philippines). 

 Figures 18, 19. — Saccammina socialis Brady. 



Challenger Sta. 246, North Pacific. (2050 fathoms) 



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