143 



K. OKAMURA. 



Plate IV. 



Fig. 1 8. Ceratium volans Cleve, a — c, from Prov. Tosa; d—eitam 

 Gulf of Tateyama in Prov. Böshyü. 

 a— e, different forms of C. volans ; a, d, c, X97 ; b, c, X 56. 

 Fig. 19. C. macroceras Khrb. f. From Prov. Shima (February, 3, 

 1 904). x 140. 



Fig. 20. C. macroceras Eh rb. f. ? From Prov. Tosa. X 97. 



a, body seen from the side of left antapical horn. 



b, seen from the ventral side of same. 

 Fig. 21. C. horridum (Cleve) Gran. 



a, b, c, — f. intermedia (a, x 140 ; b, X 144 ; c, X97). 



d, e, f, g, h, — f laevis n. f. (d, f, g, h, x 97 ; e, x 220). 



a, b, d, f, Ji, from Prov. Böshyü (May) ; c, from Prov. Shima 

 (P'eb.) ; e, g, from Prov. Tosa. 

 Fig. 22. C. neglectum Ostf. ? Specimen obtained from Prov. Isé (Feb. 



1 1 , 1904) somewhat broken, x 390. 

 Fig. 23. C. horridum (Cleve) Gran ; abnormal form. From Prov. 

 Böshyü. X 140. 



Fig. 24. C. hirundinella f. piburgense Zederbauer. From Lake Chüguji 



(Nikko). x 390. 

 Fig. 25 Ceratocorys horrida Stein. From Prov. Tosa. 



a, lateral view ; x 390. 



b, same seen from above ; x 390. 



e, same seen from below ; x 200. 



Fig. 26 Phalacroma sp. P"rom Prov. Tosa, x 220. 

 a, body seen from lower end. 



right side view of same. 



ventral view of same. 

 l'"ig. 27. Ornithocercus magnifiais Stein. From Prov. Tosa. 



a, Left side view ; x 390. 



b, right side view of same ; x 220 



t , ventral view ; diagrammatic, slightly magnified. 



