PLATE IV. 



'Fm. la-ff. — Eyalascus Jiodffsoni. Spicules. (Page 4.) 



Fig. la. — Autodermal hexactia. (x 160.) 



Fig. 1 J. — ^Autodermal penfcactin. ( x 160.) 



Fig. Ic, fii, c^ — Modified autodermalia. (x 160.) 



Fig. Id, Id^. — Hypodermal oxypentactins. ( x 50.) 



YiG.ld^ — Autogastral hexactin. (x 160.) 



Fig. le. — Holoxyhexaster. ( x 240.) 



Fig. Ifii. — Hemioxyliexaster. (x 240.) 



Fig. 1«2. — Monoxyhexaster. (x 240.) 



Fig. I/.— Holodiscoliexaster. ( x 240.) 



Fig. 1/1.— The same (part). ( x 700.) 



Pig. Iff. — Microdiscohexaster. (Optic, sect.) ( x 700.) 



Fig. 2a-g. — Rossella antarctica Carter. Spicules of Specimen A. (Page 6.) 



Fig. 2a. — Parenchymal regular hexactin. (x 160.) 



Fig. 2 J. — ^Autodermal pentactin. ( x 160.) 



Fig. 2&^ — Autodermal hexactin. (x 160.) 



Fig. 2J*. — ^Autodermal stauractin. ( x 160.) 



Fig. 2c. — ^Autogastral hexactin. ( x 160.) 



Fig. 2(f, 2^1. — Holoxyhexasters. (2# in optic, sect.) (x 160.) 



Fig. 2«?2. — Hemioxyhexaster. (x 160.) 



Pig. 2d^. — Monoxyhexaster. ( x 160.) 



Fig. 2#. — Central part of 2d^, showing termination of axial canals. ( x 700.) 



Fig. 2e.—Hemidiscohexaster (modified), (x 700.) 



Fig. 2/.— Calycocome. (Optic, sect.) ( x 700.) 



Fig. 2ff. — Portion of another calycocome with shorter smooth shaft and divergent rays, (x 700.) 



Fig. 2A.— Microdiscohexaster. (Optic, sect.) ( x 700.) 



Fig. Sor-k. — Rossella antarctica. Spicules of Specimen C, only 'dh being from Specimen B. (Page 8.) 



Fig. 3a, 3a^. — Oxypentactin basalia. ( x 50.) 



Fig. 36. — ^Autodermal pentactin. (x 160.) 



Fig. 3c. — ^Autogastral hexactin. (x 160.) 



Fig. 36^ — ^Autogastral pentactin, a kind only found in Specimen C. (x 160.) 



Fig. 3d. — Holoxyhexaster. (Optic, sect.) ( x 240.) 



Fig. 3d\ 3<^l— Hemioxyhexasters. (x 240.) 



Fig. 3d% 3^*.— Monoxyhexasters. ( x 240.) 



Fig. 3d^. — Stauractin-like monoxyhexaster. ( X 240.) 



Fig. 3d'. — Three spheroidal reduced oxyhexasters. ( X 240.) 



Fig. 3e. — Seven discohexasters, showing variation in form. ( X 240.) 



Fig. 3e^. — Hemidiscohexaster. ( x 700.) 



Fig. 3/.— Calycocome. (Optic, sect.) ( x 240.) 



Fig. 3/1.— The same (a part). ( x 700.) 



Fig. 3ff. — Part of another calycocome. ( X 700.) 



Fig. 3h. — ^Abnormal calycocome, from Specimen B. ( x 700.) 



Fig. 3fc.— Microdiscohexaster. (Optic, sect.) ( X 700.) 



Fig. 31. — Portion of a variety of microdiscohexaster. ( x 700.) 



