PLATE VI. 



Fig. 1. Hexacrinus melo. a, h, c, d, e. 



a. — dorso-central aspect, shewing its tripartite arrangement. 



h. — lateral aspect exhibiting the meso-plate between the rays, and the exca\ ations lor tlie 



attachment of the rays. 

 c. — lateral aspect, shewing the non ray bearing plate. 

 d. — non ray bearing plate. 

 e. — abdominal plates with the oral aperture, y. 



Fig. 2. Hexacrinus depressus. a, b, c, d,e. 



a. — dorso-centraj aspect, shewing its tripartite arrangement. 



b. — lateral view of a smaller specimen. 



c. — lateral aspect of another, and full sized specimen. 



d. — lateral view shewing the manner in which the meso-plates bend o\er and unite with 



the abdominal plates. 

 e. — non ray bearing plate. 



Fig. 3. Hexacrinus macrotatus. a, b, c, d. 



a. — lateral aspect shewing the non ray bearing plate. 



b. — view of a smaller specmen. 



c. — enlarged view of specimen. 



d. — non ray bearing plate magnified. 



All the specimens of Hexacrini, which are figured in plate VI. are in the collection of 

 Mr. Robert A. C. Austen, of Merrow Hous-e, Guildford; to whose kindness and liberality 

 we are indebted for an opportunity of making the drawings. 



