NOTES ON L.M. B.C. ASTEROIDEA. 149 



3. Carpenter, P. H.— " The Minute Anatomy of the 

 Brachiate Echmoderms," ' Quart. Journ. Micr. Sci., N.S.^ 

 LXXXIII, (1881).' 



4. Hamann, 0. — ' Histologie der Echmodermen,' I, II, 

 III, IV. (Fischer, Jena). 



5. MacBride, E. W. — " The Development of Amphiura 

 squamata," 'Quart. Journ. Micr. Sci., XXXIV,' (1892). 



6. Cuenot, L.— ' Comptes Eendus.' CIV, (1887) pp. 

 pp. 88—90. 



7. Perrier, E. and Poirier, J. — ' Comptes Eendus,' 

 XCIV, (1882), pp. 658—61. 



Explanation of Plates XXXVI to XXXIX. 



List of reference letters. 

 alir Aooral haemal ring; axpc axial perih^emal canal ; 

 hh Tiedemann's bodies ; hni buccal membrane ; cohr circum- 

 oral haemal ring; coz^v circum-oral water vessel ; cp cen- 

 tral plexus; g gut; gh glandular body; glis gastric haemal 

 strands; gs genital strands; int.vi interradial muscles; 

 ^}jc inner perihaemal canal ; lac lacunar spaces ; m madre- 

 porite ; mp madreporic pores ; nr nerve ring; oa oral angles, 

 oe oesophagus ; ope outer perihaemal canal ; pv Polian 

 vesicles ; rhs radial haemal strands ; ricv radial water 

 vessel; f/ tube-foot; ?6^«^ water-tube ; .c vesicular spaces. 



Plate XXXVI. 



Fig. 1. Part of a horizontal section of a young Aster ias 

 ruhens, showing the opening of the pore-canals 

 of the madreporite into the water-tube. 



Fig. 2. A similar section from a slightly older specimen. 

 It passes through the periphery of the madre- 

 porite, and shows the opening of several pore- 



