8 Coel. 
IV. Coelenterata. [1922] 
New group of skeleton forming 
Hydrozoa ; Stechow, 124. 
Descriptions of old type specimens 
of Rhizostomae , Stiasny, 129, 130. 
Use of black coral in early times ; 
Hickson, 50. 
Persistence of colonies of anemones ; 
Scott, 118. 
Notes on recent and fossil Lophehelia 
patches ; Nordgard, 94. 
Stone kernels of disintegrated fossil 
corals ; Nielsen, 92. 
Pigments of Coelenterata ; Fulton, 
32. 
Nematocysts. — Hydra , Schulze, 115, 
116, 117; Actiniaria, Carlo re n, 19. 
Corals and coral-reefs, Bruyn, 16, 
17 ; Molen GRAFF, 80. 
STRUCTURE. 
Nematocysts. — Phisalix, 108 ; 
Ewald, 30. 
Gonosome of Lictorella concinna; 
Briggs, 14. 
Secondary sexual characters of Plum- 
ularidae ; Be dot, 3. 
Comparative anatomy of Sipheno - 
phora, Moser, 83. 
Structure of Monogreptus spp. ; 
Hundt, 57. 
Fixation of Lucernaria by tonofibrils ; 
Migot, 77, 78. 
Vestigial tentaculocysts in Lucern- 
aria ; Elmhirst, 27. 
Morphology of tetraseptate corals ; 
Grabau, 45. 
Arrangement of septa in Eupsammid 
corals ; Horst, 54. 
Columella and pseudocolumella in 
corals ; Nielsen, 92. 
Histology. — Hydra , Roskin, 110 ; 
Carmarina, Schmidt, 113. 
PHYSIOLOGY. 
Digestive enzymes of Coelenterates ; 
Bodansky & Rose, 11. 
Luminescence in coelenterates ; Har- 
vey, 47. 
Pathology and Physiology of Coelent- 
erate stings ; Phisalix, 108. 
Electrical polarity in stems of 
Obelia ; Lund, 70. 
Van ’t Hoff’s law and an Actinian 
reaction ; Pieron, 107. 
Colouration of and presence of Zoo- 
xanthellae in Eunicella verrucosa ; 
Studer, 133. 
Depression in Hydra ; Goetsch, 36. 
Relation of Medusae to their environ- 
ment ; Frederxcq, 31. 
Reactions of anemones to stimuli ; 
Cotte, 24. 
Hermaphroditism and Dioecism in 
Hydrozoa ; Goetsch, 39, 40, 41. 
DEVELOPMENT. 
Araclinactis, Bourne, 13 ; Ilyanthus 
mitchellii, Stephenson, 126 ; Stomo- 
lophus, Stiasny, 131 ; Crap toli to idea, 
Elles, 26; Coeloplana, Komai, 61a; 
Gastrodes, Komai, 61a. 
Reproduction. — Hydra, Goetsch, 36 ; 
Schmidt, 112 ; Srinivasarao, 120 ; 
Hydra tuba, Herouard, 48; Perez, 
106 ; Coelenterata in Gulf of Naples, 
Cerruti, 21. 
Origin of septa in Rugosa and Madre- 
poraria ; Gerth, 34a. 
Nematocysts. — Phisalix, 108 ; Hydra 
and Porpita, Ewald, 30. 
A new form of development of the 
Medusa-bell of Siphonophora ; Moser, 
82. 
Acceleration and Retardation in 
development of corals ; Grabau, 45. 
ETHOLOGY. 
Cerianthus, Scott, 118 ; Ilyanthus 
mitchelli, Stephenson, 126; Coelo- 
plana, Komai, 61a. 
Hydra in lakes of N. Michigan ; 
Clemens, 23. 
Rejuvenation in Hy droids ; Elm- 
hirst, 28. 
Food of medusae ; Lebour, 65. 
Fixation of Hydra tuba ; Herouard, 
48. 
Breeding seasons of Scyphomedusae ; 
Elmhirst, 27. 
Feeding habits of Aurelia ; Orton 
97. 
Sociality and colony formation in Ma- 
dreporaria ; Wagenen & Weiiman, 140. 
Convergence in corals ; Hickson, 
52. 
