PLATE XXXIX 



Fig. I. Spongiobranchaea intermedia, Pruvot-Fol, ventral aspect: x 4. 



Fig. I a. S. intermedia, two suckers enlarged. 



Fig. 2. S. intermedia, dorsal aspect: x 4. 



Fig. 3. S. intermedia, contracted specimen, ventral aspect: x 3. 



Fig. 4. The same, dorsal aspect: x 3. 



