42 



THOS. H. MONTGOMERY, 



Explanation of Plates. 



All outlines have been drawn with the aid of the camera lucida 

 and the finer details studied with the ^j-^^ homogeneous immersion lens. 

 of Zeiss. Unless otherwise stated, the figures have been drawn from 

 preparations fixed with corrosive sublimate. The following abbreviations 

 have been employed in the figures : 



Plate 1. 



rig. 1. Carinella. Part of a cross section of the basal mem- 

 brane of the body epithelium, from the anterior region of the body. 

 Ehelich-Biondi stain. (Obj. A, oc. 2.) 



