LIST OF ILLUSTRATIONS. 



Fi<;. A. Thick slide, a, surface view; o, side view, showing grooved end 



for fitting into slide hox 11 



B. Thin slide, a, surface view; b, side view 11 



1. Astrorhiza angulosa. X 15 20 



2-4. Astrorhiza furcata. 2, 3, 4a, face view of three specimens selected 



by Goes from the type station; 46, side view. X 10 21 



5. Astrorhiza granulosa. X 10 22 



6. Astrorhiza crassatina. X 10 22 



7. Astrorhiza tenuis, a, longitudinal section; b, transverse section; c, 



side view of exterior. (After Goes). X6 23 



8-10. Rhabdammina abyssorum. 8a, front view; b, end view of one arm 

 of the smoother form from deep water, X 10; 9, front view 

 of a shallow water specimen from the coast of Japan, X 25; 10, 



central portion of a specimen with four arms, X 15 25 



11-12. Two specimens of Rhabdammina irregularis. X6 26 



13. Rhabdammina discreta. X 25 28 



14. Rhabdammina linearis, a-e, X 10; e, showing interior, /, surface. 



X 60. (After Brady) .' 29 



15-16. Marsipella cylindrica. X 30. 15, straight test composed largely of 

 long unbroken spicules. 16, rougher, doubly curved test largely 



made up of fragmentary portions of spicules 30 



17-21. Bathysiphon filiformis. 17a, side view, X 4; 6, end view, X 5. 

 18, longitudinal section, X 60. 19, transverse section, viewed by 

 transmitted light, X 60. 20, longitudinal section of wall with 

 exterior coat, X 60. 21, longitudinal section of inner portion of 

 wall, X 200. (Figs. 18-21. After Brady) 32 



22. Bathysiphon rufus. X 20. a, side view; b, end view 33 



23. Rhizammina alga?formis. X 10 34 



24. Rhizammina indivisa. X 20 34 



25-28. Psammosphtera fusca. 25, specimen composed of black volcanic 



sand, X 25. 26, free specimen, X 20. 27, attached specimen, 



X 40. 28, section of test, X 40. (Figs. 26-28. After Brady). . . 36 



29-30. Psammosphfera parva. 29, specimen attached to large sponge spi- 

 cule, X 50. 30, smaller specimen (after Brady), X 40 37 



31-32. Sorosphaera confusa. X 15 (after Brady") 38 



33-36. Saccammina sphserica. X 15 (after Brady). 33, free specimen. 34, 



attached specimen. 35, apertural View. 36, section 39 



37-38. Saccammina socialis. X 20 (after Brady) 40 



39. Proteonina f usiformis. X 75 41 



40-41. Proteonina difflugiformis. 40, a typical elongate specimen of fine 

 sand grains. X 80. 41, an irregular specimen with larger sand 

 grains, the large fragments at the left causing a distortion of the 

 outline of the test. X 50 42 



XI 



