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HISATO KÜWANO. 



found it, among the meshes formed by the roots of Zostera which flour- 

 ishes here and there over the flat, unlike the above mentioned smaller 

 species which is often found among such meshes. 



In natural condition, this species lies always horizontally and does 

 not make any building over the flat, while the larger co-inhabitant stands 

 vertically with up-turned anal end and makes a sand cone over the open- 

 ill" of its burrow, on which castings are always found. 



In a large percentage of specimens one. two or more of a small 

 commensal crab, yellowish brown in colour, are found in the same burrow 

 creeping about over the body of the worm. 



Like some other known species, the animal has an odour resembling 

 that of iodoform. This is so strong that by smelling the sand we are 

 able to know where the animal is to be found. Besides, the animal 

 emits readily a bright phosphorescent light making it a beautiful object 

 in the course of shore collection at night. 



Though I am unable to say decidedly that the animal practises 

 autotomy, it is at least very fragile so that it breaks off easily to pieces 

 m spite of a cautious treatment and the fragments of the caudal or even 

 the hepatic region often turn themselves inside out. 



They seem to have a power to regenerate the lost or injured portions of 

 the body, it is certain that at least the proboscis and the posterior portion 

 of the trunk are capable of being regenerated from the remaining portion. 



The breeding season may be given as mid-summer (from the end of 

 .July through August.) 



Now I will pass into the descriptions of some important anatomical 

 characters of this species leaving the details to be published in a report 

 which I am preparing on this and other forms. 



F AM. PTYCHODEKIDiE, Spenge!. 

 GEN. BALANOGLOSSUS, Delle Ohiaje. 

 Balanoglossus ?nisaJciensis, n. sp. 



External form (Pig. 1): — Proboscis subconical ; proboscis-pore opens 

 slightly to the left of the dorsomedian line of the proboscis-neck ; collar 

 high cylindrical ; on the dorsal side of the anterior surface of the collar (in 



