'HE ni.ETOG-NATHA. 



87 



X /. 



Fig. 32. Sag lit a deci/jiens, sp. ii. 

 33. A jaw. X 140. 



3-1'. Anterior and posterior teeth of left side, nearly from the anterior aspect. x210. 

 35. Vestibular ridge, showing position of first and last tooth, x 210. The strong cone on the 

 external surface is not always so well developed. 



Plate 6. 



Saffitta ? pJanctonis, Steinhaus. x C. 



Dorsal view, showing relation of corona ciliata to head and to ventral ganglion, patches of 



sense-cells, "neclc-fin," &c. x 17. 

 Vestibular ridge of left side, ventral view, x 140. 

 Anterior teeth of right side, in situ. x 140. 

 Posterior teeth of left side, in situ, x 1 10. 

 Saffitta sp. indet. (iii.), p. 74. Three jaws. x 19. 

 Krohnia hamata, Moebius. x 4. 

 A jaw. X lOG. 

 Tip of a jaw. x .520. 

 The teeth. x210. 

 Corona ciliata. x61. 

 Krohnia hamata, var. x 4. 

 Tip of a jaw. x 290. 

 Saginate jaw of young specimen. x 290. 

 Krohnia subtilis, Graaai. x 4. 



A jaw. x 106. ♦ 



The teeth, drawn in place. x 210. 



All figures have been drawn with the Abbe camera. The letters E and I indicate 

 respectively the external and internal aspects of the teeth, the vestibular ridge, &c. 



Plate 7. 



Table of frequency of species of Chsetognatha according to depth. 



SECONJJ SEKIES. — ZOOLOGY, VOL- X, 



14 



