PAULINELLA CHROMATOPHORA. 



WILLIAM A. KEPNER. 



In volume 59 of the Zcitschrift fur wissenschaftliche Zoologie 

 Lauterborn has described an interesting new Sarcodin, which he 

 named Paulinella chromatophora. During the months of Decem- 

 'ber, 1894, January and February, 1895, he found and studied 

 200 individuals whose generic and specific characteristics he 

 gave in the following : 



" Genus Paulinella. Shell elliptical, sack- or flask-shaped, in 

 transverse section circular, composed of five rows of six-sided, 

 silicious plates, mouth of shell elevated upon a neck, very narrow, 

 in transverse section a lengthened oval. The protoplasmic body 

 does not completely fill the shell cavity ; nucleus spherical, 

 rather large, with a reticular structure, situated in the posterior 

 part of the body ; contractile vacuole in the anterior third of 

 body. Pseudopodia long and slender, never anastomosing. 



"Paulinella clinnnatopliora. With the characteristics of the 

 genus. Contains one or mostly two conspicuous sausage-formed 

 chromatophore-like bodies of a blue-green color. The reception 

 of food not observed, nutrition, therefore, apparently holophytic 

 with the aid of the ' chromatophores.' 



"Length of shells : 0.020-0.030 mm., width: 0.015-0.020 

 mm., diameter of chromatophores : 0.003 mm. 



" Habitat : stagnant water of the Rhein near Neuhofen under 

 diatoms in company with Ainceba, Difflugia, Euglypha, Gromia 

 mutabilis Bail, etc." 



So far as I know this form has not since been discovered. I 

 wish to record it hereby for the United States. The specimens 

 studied met the requirements of Lauterborn's paper so well that 

 I am not justified in giving the details of the anatomy. For 

 these the reader is referred to Lauterborn's account. 



Mr. W. G. Lapham, of this place, discovered and recognized, 

 on November I, 1904, a single individual of Paulinella c/iroma- 

 toplwra in water taken from an oozy bank near Afton, Va. In 

 December the writer found specimens from a spring-pool at 

 Charlottesville, Va. They are mud-loving creatures and are 



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