140 SYNOPTIC COLLECTION. 



Bourne l objects to the use of the word strobila which 

 was originally applied to the dividing parent stock of 

 Aurelia. This is essentially different from the bud-pro- 

 ducing parent stock of Fungia, and since it is objection- 

 able to use the same name for two very different phe- 

 nomena Bourne uses nurse stock for the fixed parent of 

 Fungia. 



Rarely a specimen is found with the parent stock 

 attached to it, as seen in No. 240. This stock was cov- 

 ered over with limy deposits by the growing animal, and 

 these had to be removed by acid when the original stock 

 form was exposed with its cup-like shape and internal 

 walls. 



The central or younger portions of the adult Fungia 

 (No. 241) are imperforate but the older portions are 

 perforated. The septa increase in number from the cen- 

 ter outwards, as is well shown in No. 241. 



MADREPORARIA PERFORATA. 



The simpler members of the Madreporaria Perforata 

 are Dendrophyllia (No. 242) and Coenopsammia (No. 

 243, C. tenuilamillosa Verr.) . The former is a branching 

 coral and the latter a low, spreading form. The corallites 

 in both are large and the septa are distinct. Buds grow 

 from the sides of the corallites but a massive colony never 

 results. 



Astroides calycularis Pallas (No. 244), is a simple col- 

 ony in which the corallites are packed closely together 

 and rise to about the same height. This was one of the 

 species on which von Koch made his valuable investiga- 

 tions upon the formation of the coral skeleton. 



The Madrepore coral (Nos. 245-248), is a typical 

 example of the Perforata. The pores may be finely seen 



1 Quart. Journ. Micr. Sci., XXVII, 1887, p. 294. 



