EXPLANATION OF PLATES 



Plate 1 



Figures I. SpiriUinn vivipara Ehrenberg. (After Ehrenl:)erg.) Specimen from 

 off Vera Cruz, Mexico. 

 2-4. Spirillina vivipara Ehrenberg. X 70. Fig. 2, Porto Rico. Fig. 3, 

 Dry Tortugas, a, b, opposite sides. Figs. 4 a-c, Dry Tortugas. 

 a, b, opposite sides; c, peripheral view. 

 5 a, b. Spirillina vivipara Ehrenberg, var. densepunctata Cushman, new va- 

 riety. X 70. Porto Rico, a, b, opposite sides. 

 6. Spirillina perforata (Schultze). (After Schultze.) 

 7 a-c. Spirillina perforata (Schultze). X 75. Off coast of Belgium, a, b, 

 opposite sides; c, peripheral view. 

 8, 9. Spirillina obconica H. B. Brady (?). (After Heron-Allen and Earland.) 

 Off British Lsles. 

 10 a, b. Spirillina obconicaB.'B. Brady {'^). X 135. Porcupine Station 7. Off 

 British Lsles. a, b, opposite sides. 

 11. Spirillina margaritifera Williamson. (After Williamson.) 



12 a, b. Spirillina lateseptata Tevquem. (After Halkyard.) From off Island 



of Jersey, a, side view; b, section. 



13 a, b. Spirillina lateseptata Terciuem. X 100. From Porcupine Station 



7. a, b, opposite sides. 

 140 



