PLATE XL. 
Figs. 1, 2. Leptoclinum tenue, var. magnizooidium, nov. 
Figs. 3-5. Leptoclinum tenue, n. sp. 
Figs. 6-9. Leptoclinum jeffrey si, n. sp. 
Figs. 10-15. Leptoclinum alhidum, var. lutecium, Verrill. 
hi. Bladder cell. I l.s. Lower surface of colony. I u.s. Upper surface of colony. 
hr. Branchial aperture. 1 t.m. Test matrix. j 
Fig. 1. Colony of Leptoclinum tenue, var. magnizooidium ; natural size. 
Fig. 2. Spicule from test of Leptoclinum tenue, var. magnizooidium ; Lighly magnified 
(S., \ incli). 
Fig. 3. Colony of Leptoclinum tenue, from North Atlantic (H.M.S. “Porcupine”); 
natural size. 
Fig. 4. Spicules of the ordinary size from test of Leptoclinum tenue ; highly magnified 
(S., \ inch). 
Fig. 5. Very large spicule from test of Leptoclinum tenue ; highly magnified (S., inch). 
Figures 2, 4, and 5 are drawn to the same scale. Spicules of sizes inter- 
mediate between those shown in figures 4 and 5 are also present. 
Fig. 6. Golcmj of Leptoclinum jeffreysi ; natural size. 
Fig. 7. Vertical section through colony of Leptoclinum jeffrey si ; magnified (S., 1 inch). 
Fig. 8. Part of section through lower part of colony of Leptoclinum jeffrey si, showing 
structure of test ; highly magnified (S., \ inch). 
Fig. 9. %picvlo, ivamt&Bt of Leptoclinum jeffrey si ; highly magnified (S., ^ inch). 
Fig. 10. Colony of Leptoclinum albidum, var. lutecium; natural size. 
Fig. 11. Another colony of Leptoclinum albidum, var. lutecium; natural size. 
Fig. 12. Spicules from test of Leptoclinum albidum, var. lutecium; highly magnified 
(S., inch). 
Fig. 13. Larva of Leptoclinum albidum, var. lutecium, showing well-developed branchial 
sac co-existing with larval tail, adhering organs, &c. ; magnified (S., 1 inch). 
Fig. 14. Part of test of tailed larva of Leptoclinum albidum, var. lutecium; highly 
magnified (S., ^ inch). 
Fig. 15. Adhering organ of tailed larva of Leptoclinum albidum, var. lutecium; highly 
magnified (S., \ inch). 
