PENTACRINOID LARVAE 



213 



4. Length of crown 2-1 mm. ; length of column 7 mm. 



The stem is of 41 columnals and a thick lobed terminal plate which appears to be 

 simple; it is generally similar to that of the previous stage. There are ten very short 



Fig. 23. Pentacrinoid larvae of Notocrinus virilis. a, crown and proximal columnals of No. i. b, same of 

 No. 2. c, same of No. 3. d, same of No. 6. All X27. 



discoidal proximal columnals, those nearer the basal cup wider than the others. Most 

 of the remaining columnals in the first half of the stem are nearly as long as broad but 

 those of the distal half become progressively and gradually shorter towards the terminal 

 plate. 



