SOME NEW SCYPHOMEDUS.E OF JAPAN. 3 



from one half to one-fifth that of the umbrella. The adhesive 

 surface at the aboral end is wide. The cavity of the peduncle 

 or the basal stomach is divided into four chambers by the union 

 of the interradial Ueniola. In young specimens of a length under 

 9 mm., the peduncle is not divided into separate chambers. The 

 interradial tamiola begin to unite near the pyloric portion. 



The exumbrella is generally smooth. It is furnished here 

 and there with small groups of nematocysts. It is very thin and 

 consists of three layers : the ectoderm, the gelatinous layer and 

 the endoderm. 



The whole surface of the subumbrella is beset with very 

 large, spherical groups of nematocysts, each group opening by a 

 small pore at the end of a little neck. This neck projects only 

 a little above the surface of the subumbrella. 



The coronal or marginal muscle is ring-shaped ; it is not 

 divided, but well developed. In preserved specimens, this muscle 

 is generally contracted so that the animal is rather narrow at 

 the oral end. 



The interradial, longitudinal muscles are divided into two 

 heads at the oral end. Each head of the muscle is attached to 

 the root of the adradial bunch of tentacles. These muscles are 

 well developed and run through the whole length of the animal, 

 from the base of the peduncle to the umbrella margin. 



The eight principal tentacles are transformed into the ad- 

 hesive marginal bodies, generally known as anchors. They are- 

 large, round and sessile. They are about half as long as the 

 diameter of the peduncle. 



The secondary tentacles, the " Succursal Tentakeln " of 

 Haeckel, are grouped into eight adradial bunches, in each of 

 which are to be counted about twenty-five tentacles in four or five 



