EXPLANATION OF PLATE 21 (XXI) 



Figs. 1-11, X 10; Figs. 12, 13, X 60. 

 Figures 1-13. — Rhabdammina abyssorum M. Sars. 



Fig. 1. Challenger Sta. 78, S.E. of the Azores, Atlantic. (1000 fathoms) 

 Figs. 4, 7. Challenger Sta. 195, Banda Sea, Pacific. (1425 fathoms) 

 Figs. 8-12. Challenger Sta. 218, N. of Papua, Pacific. (1070 fathoms) 

 Fig. 13. Porcupine Sta. 23, N.W. of Ireland, E. Atlantic. (630 fathoms) 

 Brady notes that fig. 9 is a fragment of a variety "with branched arms {Rhabdammina irregularis, Carpen- 

 ter?)." Cushman (U.S.N.M. Bull. 104, Pt. 1, 1918, p. 60, pi. 8, fig. 1) raises this branched variety to specific 

 rank, although Carpenter's original note was not accompanied by any figure. The name abyssorum M. Sars 

 was a nomen nudum and the species was first figured, as R. abyssorum Sars, by Carpenter (The Microscope, 

 Ed. 6, 1881, text figures 321c, d). For this reason Cushman and others have attributed the species to Carpenter; 

 Sherborn, however, attributes it to M. Sars, and is followed here. 



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