PLATE LVIII. 



PAGE 



Bathydorus fimhriatus, F. E. S., . . . 151 



Fig. 1. Superior part of a broken specimen, preserved in alcohol ; natural size. 



Fis. 2. Vertical section through the lateral wall ; x 60. 



Fig. 3. Part of a parenchymal diact, with four cruciately disposed central knobs, 

 and rough rounded ends ; x 100. 



Fig. 4. Discohexaster with long, bent, smooth terminal rays ; x 300. 



Fig. 5. Autodermal oxytetract with rough, straight, pointed rays ; x 300. 



Fig. 6. Autogastral oxyhexact with rough, straight, pointed rays ; x 300. 



Fig. 7. Oxyhexact with long S-shaped terminal rays ; x 300. 



