EXPLANATION OF PLATE 28 (XXVIII) 



Fig. 1, Natural size; Figs. 2-5, X 8; Figs. 6, 7, 9-11, X 40; Fig. 6, X 15; Fig. 12; X 20; 

 Fig. 13, X 100; Figs. 14, 15, X 10. 

 Figures 1-11. — Rhizammina algaeformis Brady. 



Figs. 1, 2, 6. Challenger Sta. 299, South Pacific. (2160 fathoms) 

 Remainder (from text) probably from Porcupine Sta. 37, North Atlantic (2435 fathoms) 

 Figures 12, 13. — Psammatodendron arborescens Norman MS., Brady. 



In the text Brady refers to this species from Challenger Sta. 122, off Pernambuco, Atlantic (350 fathoms), 

 oflf Holstenberg, Greenland (20 fathoms), soundings ofif Nova Zemlya (10 to 219 fathoms) and Franz Josef 

 Land (89 to 145 fathoms), both in the Arctic, and ofi Cumbrae, Scotland. In 1881 Brady (Ann. Mag. Nat. 

 Hist., Ser. 5, Vol. 8, 1881, p. 404) referred this species to Psammatodendron MS., as P. arborescens Norman 

 MS. In the Challenger Report (p. 257, 262) he placed Psammatodendron in the synonymy of Hyperammina, 

 referring to Hyperammina arborescens Norman MS., Brady. Eimer and Fickert (Zeitschr. Wiss. Zool., Vol. 

 65, 1899, p. 670), Cushman and others have reinstated Psammatodendron with arborescens as type, and are 

 followed here. 

 Figures 14, 15. — Sagenina frondescens (Brady). 



Challenger Sta. 218A, Admiralty Islands, Pacific. (16-25 fathoms) 

 Since Brady's name Sagenella had been used previously by James Hall for a genus of Polyzoa, Chapman 

 . (Jour. Linn. Soc, Zool., Vol. 28, No. 179, 1900, p. 4) proposed the name Sagenina for Sagenella Brady. 



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