DESCRIPTIOX OF THE PLATES. 63 



PLATE XXVIII. 



Figs. 1-5. Aglaophenia bispinosa. 



Fig. 1. Portion of stem and pinna, magnified ; front view. 

 Fig. 2. Portion of pinna, magnified ; lateral view. 

 Fig. 3. Corbula, magnified ; viewed from above. 

 Fig. 4. Peduncle of corbula, more magnified. 



(a, a) Internodes of peduncle showing the three mesial nematophores borne by each intemode. 

 Fig. 5. Base of proximal rib of corbula, still further magnified. 



(a) Supracalycine nematophores slightly altered. 



(b) Base of mesial nematophore which has become transformed into a rib of the corbula. 



Between a and b is seen the slightly altered hydrotheca with a hydranth still visible 

 in it. 



PLATE XXIX. 



Figs. 1-4. Aglaophenia constricta. 



Fig. 1. A specimen, natural size, with some sponges growing over its stem. 



Fig. 2. Portion of stem with the proximal ends of the pinnae ; magnified. 



Fig. 3. Portion of a pinna, still further magnified ; viewed laterally. 



Fig. 4. Same, viewed in front. 



Figs. 5-7. Aglaophenia perpusilla. 



Fig. 5. Entire colony, natural size. 



Fig. 6. Portion of a pinna, viewed laterally ; magnified. 



Fig. 7. Portion of stem with the proximal ends of two pinnae, magnified. 



PLATE XXX. 



Figs. 1-5. Cladocarpus dolichotheca. 



Fig. 1. Entire colony, natural size. 



Fig. 2. Distal end of a colony, magnified. 



(a, a) Phylactogonia. 

 Fig. 3. Portion of a pinna with hydrotheca, magnified ; viewed laterally. 

 Fig. 4. Same, front view. 



Fig. 5. Portion of stem near proximal end, showing nematophores disposed like the denticles of a grapto- 

 lite. 



PLATE XXXI. 

 Figs. 1-7, CJladocarpus ventricosus. 

 Fig. 1. A colony, natural size. 

 Fig. 2. Distal end of a colony, magnified. 



(a, a) Phylactogonia. 

 Fig. 3. Portion of a pinna, still further magnified ; viewed laterally. 

 Fig. 4. Same, front view. 



Fig. 5. Portion of stem near the proximal end, with a longitudinal series of nematophores ; magnified. 

 Fig. 6. Gonangium, magnified ; lateral view. 

 Fig. 7. Same, front view. 



PLATE XXXII. 

 Cladocarpus paradisea ; an entire colony, natural size. 



PLATE XXXIII. 

 Figs. 1-6. Cladocarpus paradisea. 

 Fig. 1. Portion of a pinna, magnified ; lateral view. 

 Fig. 2. Portion of stem with proxuual end of pinna, not so highly magnified ; front view. 



