A NEW SPECIES OF ELASTPODA. 



135 



the felly is narrower and the spokes (usually 12) are shorter. Large 

 wheels are most numerous on the dorsal surface, and in the lateral 

 pedicels. Small wheels are predominant in the ventral perisoma and in 

 the dorsal papillae. Arcuate or spindle-shaped spicules are present on 

 the pedicels and tentacles. 



Color. — In alcohol, white grey without any white spots. In fresh 

 state, heautiful light violet with deeper tints on the dorsal papillao, etc. 

 A rather broad straw yellow streak on each side of the dorsal surface 

 along and outside the outer series of dorsal papillao, becoming fainter 

 toward the front. 



Habitat. — In all parts of the Sagami Bay and of the outer part of 

 the Tokyo Bay in waters deeper than 250 fathoms. Specimens in 

 the Museum of this Institute. 



The above description shows that this species closely resembles J. 

 maculatus, the only distinct points of difference being the entire absence 

 of dichotomously branched bodies, and the comparative shortness of the 

 dorsal papilke. Compared with the measurements given by Theel, 

 the wheels, large and small, seem also to be slightly larger in the 

 present species. It is a fact worth noting that the two species of 

 Ilyodœmon occur at about the same longitudes (between 120° — 150° E) 

 but are separated by about 20 degrees of latitude. Anatomical notes as 

 well as some interesting facts relative to the growth of the animal I 

 reserve for some future occasion. 



I take great pleasure in naming this present species after my 

 friend and colleague, Prof. Dr. Ijima, in pleasant remembrance of many 

 uncomfortable but fruitful days spent together on fishing boats on the 

 Sagami seas and in appreciation of his great services in unearthing the 

 treasures of those deeper parts. 



Sept. 19, 1897. 



Printed October 15, 1897. 



