NOTES ON L.M.B.C. ASTEROIDEA. 943 
3. Carpenter, P. H.—‘‘ The Minute Anatomy of the 
Brachiate Echinoderms,” ‘ Quart. Journ. Micr. Sci., N.S., 
LXXXIII, (1881).’ 
4. Hamann, O.—‘ Histologie der Kchinodermen,’ I, II, 
TTI, IV. (Fischer, Jena). 
5. MacBride, H. W.—‘‘ The Development of Amphiura 
squamata,”’ ‘Quart. Journ. Micr. Sci., XXXIV,’ (1892). 
«6, Cnenc 1 Comptes Rendus.’ CIV, (1887) pp. 
pp. 88—90. 
7. Perrier, EH. and Poirier, J.—‘ Comptes Rendus,’ 
XCILYV, (1882), pp. 658—61. 
EXPLANATION OF PLATES XXXVI to XXXIX. 
List of reference letters. 
ahr Aboral hemal ring; axzpe axial perihemal canal ; 
6b Tiedemann’s bodies; bm buccal membrane; cohr circum- 
oral hemal ring; cowr circum-oral water vessel; cp cen- 
tral plexus; g gut; gb glandular body; ghs gastric heemal 
strands; gs genital strands; ¢t.m interradial muscles ; 
ype inner periheemal canal; dac lacunar spaces; m madre- 
porite; mp madreporic pores; n7 nerve ring; oa oral angles, 
@ oesophagus; ope outer perihemal canal; pv Polian 
vesicles; rhs radial hemal strands; rwv radial water 
vessel; ¢f tube-foot ; wt water-tube; 2 vesicular spaces. 
I EAUIOEPXOXOXGV ALE, 
Fig. 1. Part of a horizontal section of a young Asterias 
rubens, 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- 
