ß Dr. Asajiro Oka: 



simple oval slit placed transversely on the anterior wall of the 

 tubercle. 



The alimentary canal forms a simple loop lying almost entirely 

 behind the branchial sac. The stomach is only moderately large 

 and is rather thick walled. The duodenal portion of intestine is 

 somewhat pyramidal in shape with the base next the stomach, its 

 wall is very thin. Anal aperture without lobes. 



The reprochictive organs are mostly atrophied in fully grown 

 individuals. A large oval incubatory pouch containing a single 

 larva is seen alongside the branchial region. 



There are at present only two examples of this species known 

 to me, both attached to a colony of a white coral. According to 

 the statement of the collector, K. Aoki, they were obtained in 

 the deeper parts of the Sagami Sea together with Euplectella, 

 Metacrinus, etc., but the label having been lost, the exact date and 

 locality of their capture can not be ascertained. A brief account 

 of these colonies with remarks upon the systematic position of 

 the species was given by me at the meeting of the Tokyo 

 Zoological Society in January of the year 1907. The type spec- 

 imens, partly injured by dissection, are deposited in the 

 zoological collections of the College of Science, Imperial Univer- 

 sity, Tokyo. They are preserved in a mixture of alcohol, 

 glycerin, and water, and seem not to have lost much of the 

 original transparency. 



Description of the Colony. 



General appearance. The colony has exactly the shape of a 

 drinking cup (PI. I., fig. 1.) and may, for convenience of descrip- 

 tion, be divided into the stalk and the head. The stalk is attached 

 by its lower extremity to some foreign body, and bears the head 

 on its upper end. It is short and rather thick. It is of equal width 

 throughout from the point of junction with the head to within a 

 short distance of the lower end, where it expands to form a base 

 of attachment. The diameter of the base measures 8 — 12 mm., 

 that is, nearly as much as the length of the stalk and more than 

 twice its diameter in the upper part. Its surface is quite smooth. 



