249 ART. 2. — H. MATSUMOTO : 



situated deep within the oral shts ; apical two or three of them 

 arise from the dental plate. Teeth and dental papillae proper not 

 present. Interbracliial ventral surfaces covered by a thin skin, 

 which contains fine, hyaline scales. Genital bursa? absent, genital 

 slits invisible. Genital plates and scales entirely internal, very 

 slender, those on the same side of a radius articulating with each 

 other at the end. Peristomial plates absent. Oral frames very 

 long. Vertebra} of the free arms more or less divided into halves 

 by a moniliform longitudinal slit. 



I do not agree with Sladen in the interpretation of certain 

 structures of the body. Sladen's " side mouth shields " are, in 

 my opinion, genuine oral plates, and his " genital scales " true 

 adorai shields, i. e. side mouth shields. Sladen's " oral papillae " 

 may be retained, if the meaning of these terms be extended to 

 include the scales of the first oral tentacles. Sladen's " apical oral 

 papiUa " or the " single tooth " in my preliminary paper is proved 

 not to be a papilla or tooth, but to be the dental plate. The 

 " septa " or " divisional plates of the ambulacral system " of 

 Sladen are, according to my own observations, not true plates, 

 but merely ridges projecting ventrally from the basal, or adradial, 

 parts of the modified lateral arm plates, and bearing tentacle scales 

 on the maro;in. 



Astrozyhiuva Jcawamiirai Matsumoto. 



Astropliiura Iccnvaviîirai : Matsumoto, Auuot. Zool. Japon., Vm, 1913, 

 p. 225, PI. Ill, figs. 1 & 2. 



One specimen ; Okinosé (a submarine bank), Sagami Sea ; 

 330 fathoms. 



Diameter of the pentagonal " asteroid " body 12 mm.; that of 



