PLATE X. 



Spirastrella purpurea (Lmk.) Rdl. 

 Spicula. 



Fig. I. S. E. 92a. x — & Tylostyli and styli; X 300. 1 — r Spinispirae; ,■ 400. u — $ ld. a little less magnified. 

 % — -^ Minute spinispirae vvith "denticulated" spines; Zeiss, oil-immersion, ocul. 12. 



Fig. 2. B.M. 10. Spirastrella cunctatrix Crtr. a — £ Tylostyli; X 300. v t — v Spinispirae; X 400. 



Fig. 3. B.M. 1. Spirastrella cunctatrix vzr.porcata Crtr. Type. « — £ Styli and tylostyli ; X 300. v, — c Spini- 

 spirae; • 400. 



Fig. 4. B.M. 16. Spirastrella cunctatrix var. robusta Crtr. Type. c — 5 Stylus and tylostyli; • 300. s — % 

 Spinispirae; X 400. 



Fig. 5. B.M. 32. Suberites wilsoni Crtr. Co-type. y. — £ Tylostyli; < 300. >j — A Spinispirae; X 400. 



Fier. 6. B.M. 13. Spirastrella cunctatrix Crtr. x — £ Styli and tylostyli; x 300. « — o Spinispirae; X 400. 



Fig. 7. B.M. 3. Spirastrella cunctatrix var. robusta Crtr. « — ; Spinispirae; X 400. 



