IGO J. J. LISTER. 



(e.) Calcarina hispida, Brady. Figs. 34-37. 



Some examples of this species were contained in satid 

 collected with corals from a depth of from 20 to 40 fathoms off 

 the Tonga Islands. They were preserved in spirit of about 7(J per 

 cent. Of these, twenty-two belong to the megalospheric form, 

 and two to the microspheric. In this species also there is a 

 considerable quantity of the chitinous element in the walls of 

 the chambers, which remains after the lime has been dissolved. 

 Owing to the presence of this substance the walls of the 

 chambei's of specimens which are mounted in Canada balsam 

 are generally to some extent shrivelled ; hence the measure- 

 ments of the chambers fall rather short of their proper size. 



The average mean diameter of the megalosphere in twelve 

 specimens is 49 /i, the extremes being 58'5 and 38"5 /i. (fig. 34). 



The microspheres in the two microspheric examples measure 

 15 X 12-5 /i and 13 x 11 /a (fig. 35). 



In the thirteen examples of the megalospheric forms in 

 which the preservation is sufficiently good to show the nuclear 

 characters, a single large nucleus is present (fig. 34). 



In one of the microspheric forms at least five small nuclei 

 can be seen, and probably others are present, but the preserva- 

 tion is not sufficiently good to allow the nuclei to be well seen. 



In the other microspheric specimen, while the inner chambers 

 are empty, several of the terminal chambers contain numbers 

 of large protoplasmic bodies, in number about 140 (figs. 36 and 

 37). At first these bodies are flattened against one another, 

 but as the series of chambers is followed they assume a more 

 perfectly oval shape. In seven examples the mean of the long 

 and short diameters is 58'3 fi. A round nucleus may be de- 

 tected in many of them. 



It appears probable that these bodies are young megalo- 

 spheric individuals which have not yet acquired a shell. 



