PLATE 51. 
Hyalonema (Phialonema) pateriferum Witson. 
Figures 1-28. 
1.— View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. 
2.— Groups of large macramphidises from a spicule-preparation; magnified 100; phot. Zeiss, apochr. 
16, compens. oc. 6. 
3-6.— Small micramphidises; magnified 500: 
3, 5, phot. Zeiss, H. I. apochr. 2, compens. oc. 4; 
4, 6, phot. Zeiss, apochr. 4, compens. oc. 12. 
7-12.— Large micramphidises;, magnified 500: 
7, 8, 10-12, phot. Zeiss, H. I. apochr. 2, compens. oc. 4; 
9, u. v. phot. Zeiss, q. monochr. 6, q. oc. 7. 
13, 14.— A large micramphidise; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 4: 
13, focussed higher; 14, focussed lower. 
15.— Side-view of a small macramphidisc, with regular anchors; magnified 500; u. v. phot. Zeiss, q. 
monochr. 6, q. oc. 7. : - 
16.— Side-view of a large macramphidise with spirally twisted anchors; magnified 500; phot. Zeiss, 
apochr. 4, compens. oc. 6. 
17, 18.— Side-views of large macramphidises; with regular anchors; magnified 500; phot. Zeiss, apochr. __ 
4, compens. oc. 6. 
19, 20.— Side-views of a large macramphidise with regular anchors; magnified 500; phot. Zeiss, apochr. 
4, compens. oc. 12: 
19, focussed lower; 20, focussed higher. 
21, 22.— Apical views of anchors of large macramphidises; magnified 500: 
21, u. v. phot. Zeiss, q. monochr. 6, q. oc. 7; 
22, phot. Zeiss, apochr. 4, compens. oc. 12. 
23-28.— Microhexactines; magnified 500: 
23, 24, 26, 28, ordinary microhexactines with strongly and regularly curved rays; phot. Zeiss, 
apochr. 4, compens. oc. 12; 
25, an exceptionally large microhexactine with irregularly curved rays; u. v. phot. Zeiss, q. monochr. 
Oh Ch OOs 1/5 
27, a microhexactine with rays only slightly curved; phot. Zeiss, H. I. apochr. 2, compens. oc. 4. 
