CHAETOGNATHS OF MISAKI HARBOE. 



)'.) 



teeth than that described by Conant. The corona ciliata is long, ex- 

 tending anteriorly between the eyes to the base of the brain. It does 

 not reach posteriorly, in oar specimens, to the level of the abdominal 

 ganglion, as described by Conant. The intestine has two diverticula at 

 its beginning. The tactile prominences are very numerous and are 

 arranged somewhat like those of Sagitta hexaptera. 



10. Krohnia foliacea, nov. sp. 



(Figs 10 & 16.) 



The essential characteristic of this species lies in the possession of a 

 single pair of lateral fins of remarkable size. It extends from before the 

 abdominal ganglion to the middle of the caudal segment, and its breadth 

 is nearly equal to that of the trunk. Along its margin the tactile pro- 

 minences are arranged symmetrically in both fins at more or less regular 

 intervals. The body is 11 mm. long, and the caudal segment nearly 

 Ys as long. The epidermis and the muscular coat are thick just as in 

 Sagitta bipunctata, comparing individuals of equal size. At the anterior 

 part of the trunk segment there is a thin but well marked transverse 

 muscular layer on the ventral side. The corona ciliata is flask-shaped, 

 and lies on the head segment. 



Seizing hooks 7, and the single row of teeth, which corresponds 

 to the posterior row in other chaetognaths consists of 5 teeth. The 

 top of the seizing hook is strongly curved inwards (fig 16). 



I caught only two specimens of this species in the spring of 1896, 

 and as both were young, with unripe genital organs, I can not give 

 further descriptions. 



11. Krohnia pacifica, nov. sp. 



(Figs. 11, 14, & 15). 



This species can be easily distinguished by its faintly yellowish- 

 green epidermis and the ovaries of the same color. One mature 



