ON THE LIFE-HISTORY OF THE FORAMINIFERA. 125 



chambers, and in another specimen, with thirteen chambers, one 

 nucleus was also present. 



VI. Ghilostomellidce. — No record. 



VII. LagenidcB. — A single round nucleus is described in 

 species of the genus Lagena, by M. Schultze ((38), p. 56), 

 F. E. Schulze ((42), p. 14), Gruber ((14), p. 501), and Butschu 

 ((7), p. 83). In BiJTSCHLi's figure a coarse nuclear reticulum 

 and rounded nucleoli are represented. 



VIII. Globigerinidw. — A single large nucleus containing 

 granules, is described by R. Hertwig ((17), p, 845) in a 

 specimen of Globigerina bulloides, d'Orb. 



IX. RotalidcB. — In Spirillina vivipara, Ehrb., Butschli((7), 

 p. 84) described numbers of minute stained bodies distributed 

 through the protoplasm. Some of these be considered to be nuclei, 

 while others were regarded as stained portions of food material. 



In Biscorbina, sp., numbers of bodies regarded by this author 

 as probably nuclear in nature, were found in the protoplasm 

 ((7), p. 86). 



In a species belonging to the Rotalidae, R. Hertwig ((16); 

 p. 49) found a single nucleus in individuals whose chambers 

 numbered from 1 to 3. The central chambers in these specimens 

 measured from 27 to 35 /j, in diameter. In examples with four 

 chambers, from one to four nuclei were present. The size of 

 the central chamber is not stated in these cases, but from the 

 figures it appears that its diameter was about the same as in 

 the examples mentioned above. 



F. E. Schulze mentions ((42), p. 20) the occurrence of a 

 single nucleus quite similar to that of Polystomella (see below) 

 in Rotalina, sp. 



In Calcarina Spengleri (Linn.), Butschli ((7), p. 85) de- 

 scribed and figured a single large nucleus, with a clearly-marked 

 reticulum. Nucleoli were present in the peripheral zone, in 

 three cases out of four. In some the nucleoli are said to have 

 a fine reticular structure. 



X. NummulinidcB. — In Amphistegina Lessonii, d'Orb., 

 Butschli ((7), p. 86) also found a single large nucleus in one 

 of the inner chambers. Some small bodies in the later chambers, 



VOL. VI. 1^ 



