165 



The specimens were dredged in St. Vincent's Gulf, Inves- 

 tigator Straits, and Backstairs Passage, at depths ranging 

 from 14 to 22 fathoms. 



EXPLANATION OF PLATES. 



Plate V. 

 1 Tremafofrochvs HecUeyi — a, corallum, magnified 6 diam. ; 

 &, calice of another example, magnified 8 diam. 



2. Trochocyathiis Petterdi — a. corallum, magnified 6 diam.; 



h, caiice of same, magnified 10 diam. 



3. Parncijathus vittatus — a, corallum with portion of shell to 



which it is attached, magnified 4 diam. ; 5, calice of same, 

 magnified 10 diam. 



4. Notophyllia recta — a, corallum, magnified 4 diam. ; h, calice 



of another example, magnified 6 diam. 

 h Kionotrochns Suferi — a, corallum, magnified 6 diam. : b, 

 calice of same, magnified 8 diam. 



Plate VI. 



1. Ceratotrochus recidirus — «, corallum of a large example 



attached by its base to a wall fragment, magnified 2 diam. •, 

 b, calice of another example of equal size, magnified 4 

 diam. 



2. Cerafotrochus recidivus — Three examples showing develop- 



ment of corn 11a, all magnified 2 diam. : a. with base im- 

 mersed in tlie remains O'f an earlier corallum ; 6, with 

 corallum split into 4 portions and calice elongated ; c, two 

 young coralla, joined by their sides, and attached at the 

 base to the same wall fragment. 



3. HomopliyUia incrustans — a, calice and portion of shell which 



it incrusts, magnified 4 diani. : 5, portion of calice showing 

 one system of .septa, magnified 12 diam. 



4. CaryophylUa planilameUata — «, corallum, magnified li diam. ; 



h, calice of same, magnified 2^ diam. 



5. DendrophyUia airata — «, corallum, magnified 1^ diam. ; 6, 



calice of separate individual, magnified 6 diam. 



