240 THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 5. Stephanotrochus platypus, a smaller specimen than the foregoing, a View of 

 the under surface, showing in the centre an attachment to a small spiral 

 shell, b Mouth of the calicle. c Tip of one of the exsert septa and its 

 corresponding costa much enlarged. Off Sydney, New South Wales. 410 

 fathoms. 



PLATE IV. 



Fig. 1-6. Young specimens of Desmophyllum ingens, showing various stages of growth. 



Patagonia. Lat. 52° 50' S., long. 73° 53' W. 245 fathoms. 

 Fig. 7. Cyathoceras comic, a Mouth of the calicle. Off the Eio de la Plata. Lat. 37° 



17' S., long. 53° 52' W. 600 fathoms. 

 Fig. 8. Caryophyllia maculata. a Mouth of the calicle of the same. Off Barra Grande, 



Brazil. 400 fathoms. 

 Fig. 9. Caryophyllia maculata, larger specimen than the foregoing, attached to a branch 



of a Stylasterid. Above 9 (with its number accidentally omitted in the 



plate), view of the mouth of the calicle of the same, enlarged three diameters. 



Off the Kermadec Islands. 630 fathoms. 

 Fig. 10. Deltocyathus magnificus. Under surface. Off the Ki Islands. 129 fathoms. 

 Fig. 11. Stephanophyllia formodssima. Under surface. Off the Ki Islands. 129 



fathoms. 

 Fig. 12. Stephanophyllia complicata. Under surface. Off the Ki Islands. 129 fathoms. 



PLATE V. 



Figs. 1-4. Desmophyllum ingens. Patagonia. Lat. 48° 18' S., long. 74° 33' W. 345 

 fathoms. 



1. A specimen showing two examples of the largest size fused together laterally, 



with an attachment at the base to a fragment of a third example, a Mouth 

 of the calicle of the upper example. 



2. A somewhat deformed specimen, with roots at the base encrusting the skeleton 



of a Gorgonoid. a Mouth of the calicle of the same, showing one side dis- 

 torted and bent inwards. 



3. A cylindrical example, with numerous basal roots also adherent to the skeleton 



of a Gorgonoid. a Mouth of the calicle of the same. 



4. Mass composed of numerous examples fused together reduced in size one- 



half, a View of the broken end of the lower part of one of the calicles to 

 show the continuation of the septa within it, and absence of a columella. 



