26 ART. 4. 1. IKEDA : 



hard, and with very rough surface on account of the presence 

 of tall (0.3 mm. high) papillse which are closely set. Hook- 

 rows 80-100, consisting of tall (0.10 mm.) hooks which are 

 provided with a sharp and strongly curved apical tooth and a 

 small blunt accessory tooth. Tentacles 35-40 in number, 

 arranged in a semicircle above the mouth. 



Longitudinal muscles, divided into separate but frequently 

 anastomosing bundles, number 30-35 in the posterior half of 

 the body proper. In young individuals, they are sometimes found 

 in the continuous state. Of the four retractor muscle, the 

 ventral pair are rooted in the middle third and the dorsal pair 

 in the anterior third of the body proper. Intestinal spirals, 

 12-14 in number. Rectal intestine short. Spindle-muscle fixed 

 at both ends. Only one fixing muscle is present. Segmental 

 organs very long, reaching nearly down to the posterior end 

 and accompanied by a mesentery along the wliole length. 



Numerous specimens of this species were collected by me, 

 in April 1901, on the Islands of Amami-Oshima (Nase) and of 

 Okinawashima (Chinensaki and Naha). They burrow in fissures 

 of coral rocks along the tide marks. 



PHYMOSOMA ONOMICHIANUM, n. sp. 



(Figs. 7, 56-58). 



The present species is based on a single specimen which I 

 discovered in a collection made by Mr. Izuka, in 1901, in the 

 inlet of Onomichi (Province of Bingo). The specimen is pre- 



