58 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



HERTWIG, O. and R. '78. Das Nervensystem und die Sinnesorgane der Medu- 

 sen. Leipzig. 



HESSE, R. '95. Ueber das Nervensystem und die Siunesorgane von Rhizostoma 

 Cuvieri. Zeitschr. f. wiss. Zool., Bd. LX, Heft 3. 



MULLER, F. '59. Zwei neue Quallen von St. Catherina (Brasilien). Abhand- 

 lungen der naturf. Gesellschaft zu Halle. 



SCHEWIAKOFF, W. '89. Beitrage zur Keiintniss des Acalephenauges. Morph. 

 Jahrb., Bd. XV, Heft 1. 



WILSON, H. V. Unpublished notes. 



TABLE OF REFERENCE LETTERS. 



afr adradial furrow. 



afr' = furrow in Tripedalia that separates perradial from interrad. regions in 

 lower half of bell. (In Charybdea the same furrow is directly continuous with afr.} 



ax axis of nerve, 

 c = concretion. 



cc = canal underneath ivl, connecting the two adjacent marginal pockets. 



ccl = circular canal. 



ci cilia. 

 cm circular muscle. 



co = cornea. 



cp = capsule of lens. 



cs = covering scale of niche, 

 esc = canal of sensory club. 



ct = canal of tentacle. 



ct' = beginning of canals of lateral tentacles in Tripedalia. 



ec = ectoderm. 



ece = ectoderm of exumbrella. 

 ecs = ectoderm of subumbrella. 



ed = distal paired eye. 



el larger unpaired eye. 



en = endoderm. 



enc = endoderm of sensory club. 

 enf tract of nerve fibres underlying endoderm. 

 en ft = endoderm of floor of stomach. 

 enp = endoderm of stomach pockets. 

 enr = endoderm of roof of stomach. 

 ens = endoderm of stomach. 



ep = proximal paired eye. 



es smaller unpaired eye. 



fc funnel leading into canal of sensory clubs. 



fp = fibre from subepithelial plexus of subumbrella. 

 fph = filaments of phacellus. 

 frn f renulum. 



ft = funnel-shaped depression in ectoderm axial to base of tentacle. 

 g = gelatine. 



