NO. 2062. NEW ROTATORIA FROM PANAMA— EARRING. 563 



The crying need of rotatorian taxonomy is at present exact and 

 full descriptions of all the known species. Too much stress can not 

 be laid upon complete descriptions. It is not sufficient to differen- 

 tiate the species from all others known to-day. It is quite evident 

 that we know as yet only a small fraction of the total number of spe- 

 cies of Rotatoria extant, consequently a description (and figure) 

 should record all that can be ascertained in order to enable the future 

 discoverer of a closely related animal to decide whether his specimen 

 belongs to an old species or is really an undescribed form. This should 

 not be construed as disparaging comparisons with known species. 

 These are very useful, but should be only accessory. Our main 

 dependence must be a detailed and full description. By description 

 is to be understood not merely the word picture, but also the figure, 

 which in the absence of a fixed terminology is absolutely necessary. 

 It is indeed doubtful whether combinations of words will ever be 

 sufficient to differentiate Rotatoria without being supplemented by 

 an illustration. 



EXPLANATION OF PLATES. 



All figures are highly magnified. For actual measurements see text. 



Plate 16. 



Fig. 1. Brachionus dolahratus, ventral view; page 529. 



2. Brachionus dolahratus, lateral view. 



3. Lepadella imbricata, ventral view; page 549. 



4. Lepadella imbricata, lateral view. 



5. Lepadella imbricata, cross section of body. 



6. Lepadella cyrtopus, ventral view; page 550. 



7. Lepadella cyrtopus, lateral view. 



8. Lepadella cyrtopus, cross section of body. 



Plate 17. 



Fig. 1. Brachionus patulus macracanthus, dorsal view; page 530. 



2. Trichocerca nitida, lateral view; page 551. 



3. Lecane curvicornis, lateral view; page 535. 



4. Collotheca poly phema, lateral view, page 555. , 



Plate 18. 



Fig. 1. Lecane marshi, ventral view; page 537. 



2. Lecane marshi, lateral view. 



3. Lecane marshi, dorsal view. 



4. Lecane ercodes, ventral view; page 537. 



5. Lecane ercodes, lateral view. 



6. Lecane ercodes, dorsal view. 



Plate 19. 



Fig. 1. Lecane fiexilis, ventral view; page 538. 



2. Lecane fiexilis, lateral view. 



3. Lecane flexilis, dorsal view. 



4. Lecane arcula, ventral view; page 539. 



5. Lecane arcula, lateral view. 



6. Lecane arcula, dorsal view. 



