On a New Antipatharian 

 Hexapathes heterostieha, n. g. et n. sp. 



By 



Kumao Kinoshita, Rigakushi. 



Zool. Inst. Science College, Tokio Univ. 



Among the collection of Antipatharia in the Zoological Institute, 

 Science College, there is an interesting species which cannot be 

 referred to any of the known genera of the group. It is represented by 

 several specimens, some being labeled as having been obtained in 

 the Sagami-Bay from a depth of 400 fathoms. Superficial examination 

 points that this form is very closely allied to the genus Bathypathes, 

 especially in reference to the mode of branching and to the form of 

 polyps, so that I took it at first for an aberrant form of that genus. 

 But upon further examination of the polyp body, I have found that 

 it does not possess sulco- and sulculolateral mesenteries, 1 the pre- 

 sence of which, according to Schultze's system, constitutes a highly 

 important character of the above mentioned genus. The specimens 

 in question can not therefore be referred to Bathypathes. Hence I 

 propose to institute for them a new genus, Hexapathes, placing it in the 

 Cladopathinar, the third subfamilyof Antipathidse. 



The following description is based upon a specimen which was 

 taken as the type. 



The stem is simple, almost cylindrical and arises from a small basal 

 expansion. Its total length is 20 cm. ; the basal stem is 2 cm. in length, 

 and 2 mm. in diameter in the upper parts. The remaining parts of the 

 stem are provided with numerous simple branchlets. Of these branchlets 



1) Abhandl. der Senckenbergischen Natut forschenden Gesellschaft, 23. 



2) In accordance with the rules of nomenclature of 1904, I propose the new name 

 Cladopathince for the subfamily Hexamerota Schultze. 



