NOTES ON ECHINODERM MORPHOLOGY. 319 



Notes on Echinoderm Morphology, No. VIII. 

 On some Points in the Anatomy of Larval 



Comatulse. 



By 



p. Herbert Carpenter, ]>.Sc., 



Assistant Master at Eton Collesre. 



With a Woodcut. 



While preparing the morphological section of my report on 

 the " Challenger " Crinoids, I have continually felt the want of 

 some knowledge of the organogeny of the Crinoid-type during 

 the later larval stages. Gotte's admirable observations on the 

 '' Cystidean phase/' and the early Pentacrinoid_, have told us 

 much about the development of the water- vascular ring ; while 

 Ludwig's researches have thrown considerable light on the 

 relations of the primary water-pore and water-tube.^ But in 

 neither case were the larvae studied sufficiently advanced to 

 afford any results as regards the earliest condition of the 

 chambered organ, and of the puzzling glandular structure con- 

 nected with it. 



These points, however, were just those about which I desired 

 information ; and I therefore took steps to obtain a supply of 

 larvae for the purpose. A. R. Hunt, Esq., M.A., F.G.S., of 

 Torquay, was good enougli to supply me with a considerable 

 number which he had dredged in Torbay; and several more 

 were sent me from the zoological station at Naples, to the 



1 " tJber deu primareu Steinkanal der Crinoideen, nebst vergleichend ana- 

 tomiscli Bemerkuugen iiber die Echiuodermen iiberhaupt," 'Morph. Stud, 

 an Echinod./ Bd. ii, pp. 34-45. 



