THE GEPHYREA OF JAPAN. 45 



(Fig. 76) which are hyaline and colorless and measure about 

 0.015 uiin. in height. 



The longitudinal muscle is, in the middle of the main part 

 of the body, divided into frequently anastomosing bundles, but 

 is quite continuous in the region of the introvert-basis and in 

 the posterior fourth of the body proper. The sexual oi'gans 

 {sx, Fig. 77) are developed as two slender wavy bands at the 

 roots of the retractor muscles {vm). The intestinal convoluti()n 

 {ic) consists of about 12 spirals, and is traversed by the spindle 

 muscle (sm) which is fixed to the body-wall at both ends. There 

 is no fixing muscle at all. The blind diverticulum {rg) is attached 

 to the middle part of the rectum. The segmental organs (so) 

 are in length equal to about two-thirds of the body proper, and 

 are of a pale reddish brown color. The organs are for the whole 

 length accompanied by a mesentery. Their external apertures 

 are situated at the same level as the anus [a). The anterior 

 terminal portion of the i-ectum is provided with well-developed 

 wing-muscles {wm). Two In-own eye-spots on the ganglion ig). 

 Tentacles short, 10 in number. 



Habitat : Kataura in the province of Satsuma. The worm 

 was found in a small hole bored through a small piece of dead coral. 



ASPIDOSIPHON ANGULATUS, n. sp. 



(Figs. 11, 78-80) 



Only one specimen of this species has Ijeen collected by me 

 (1901) in the Inlet uf Katsuyoki in the Amami-( )shima Island. 

 It lived in a dead coral that was exposed at low tide. The 



