34 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE IL 



Licnophora macfarlandi, sp. nov. 



Fig. 4. Oblique longitudinal section, cut through centre of attachment disc, 

 and just dorsal to the roof of the pharynx. Lettering in general 

 same as in Plate L j , pellicula of attachment cup; k, ectoplasmic 

 layer; /, fibre layer; n-^, one of the macronuclei; n^, micronucleus; 

 yi, larger neck fibre; /a, smaller neck fibre; s-^^ cross-section of 

 oral band; ^\ basal band of cilia, Hermann fixation, iron-haema- 

 toxylin staining. (Same fixation and staining for figs. 4 to 16.) 

 L. oc. 3, ob. xV. cam. 

 Fig. 5. Oblique section through attachment cup, showing velum (v), bases 

 of cilia (6), fibre layer (/;, branching base of neck fibre (/i), and a 

 portion of the smaller neck fibre (/a). L. oc. 3, ob. jV, cam. 



Slightly oblique section through base of the ciliary membrane, 

 showing four rows of basal bodies. L. oc. 3, ob. ^21 cam. 



Oblique section through attachment disc just below the fibre layer 

 of the cup, showing micronucleus (^j). larger neck fibre {f-^, 

 ventral neck groove {h), and vibratile neck membrane (e). Zeiss, 

 oc. 3, ob. D, cam. 



Oblique section of attachment disc, showing concentric wave-like 

 appearance of ciliary membranes (w) and vibratile neck mem- 

 brane {e). L. oc. 3, ob. 7, cam. 



Transverse section through oral disc, showing the cilia-bearing 

 bands of the roof of the pharynx, with basal fibre above. L. oc. 

 3, ob. 7, cam. 



Oblique transverse section through oral disc, showing Boveria 

 subcylindrica gen. et sp. nov. in the mouth and pharynx of 

 Licnophora. L. oc. 3, ob. 7, cam. 



Superficial longitudinal section of left side of dividing Licnophora, 

 showing newly formed oral band — right spiral — with central cilia 

 degenerating {t). Z. oc. 6, ob. D, cam. 



Transverse section through new oral band (fig. 11 at level oia-b); 

 a slightly earlier stage than that shown in fig. 11, showing trans- 

 verse cilia-bearing band (z), no basal fibre, short cilia throughthe 

 central portion of the field, and long fine ones on the ciliary 

 bands. L. oc. 3, ob. yV; cam. 



Oblique longitudinal section through a specimen in an advanced 

 stage of division, showing the inner short cilia on the dividing 

 line between the two cups {u). L. oc. 3, ob. 7, cam. 



Longitudinal section of a division stage later than those shown in 

 figs. II and 12, showing cross-sections of new oral band with 

 basal fibre {s^, micronucleus enlarged and changed in position 

 (^2), and concentrated nuclear mass {n^. L. oc. 3, ob. 7, cam. _ 



Tangential section showing a portion of cihary field with short cilia 

 and distinct basal bodies [x), also united macronuclei («i). 

 L. oc. 3, ob. yV, cam. 



Tangential section of dividing individual, showing right-coiled 

 secondary oral band (b^, and a part of the primary band (^j), at 

 an earlier stage than fig. 11. L. oc 3, ob. yV> cam. 



Reconstruction from several camera drawings of specimens macer- 

 ated with potassium bichromate, showing the relation of the 

 larger neck fibre to the attachment cup and to the transverse 

 cilia-bearing bands of the oral band (b^\ y, the larger divisions 

 of the neck fibre in the fibre layer of the attachment cup. Cilia 

 shown diagrammatically at but two places. 



