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 Sinnesorgane von Rkizostoma 

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



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

 lungen der naturf. Gesellschaft zu Halle. 



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

 Jahrb., Bd. XV, Heft 1. 



WILSON, H. V. Unpublished notes. 



TABLE OP 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. 

 enfl 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 = frenulum. 



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

 g gelatine. 



