136 ' IWAJl IKED A. 



both iu its general " facies " and its anatomy, I suspected 

 that the type-specimen of H. ijimai might possess the two 

 structures mentioned above, and I asked Mr. S. Takahashi, 

 my colleague in the College of Hiroshima, to re-examine the 

 type-specimen. His reply was that H. ijimai has hooks 

 similar in nature to those of the present species, but no 

 skin-papillfB at all. Thus informed, 1 have decided to propose 

 the new genus Acanthohamingia for the reception of both 

 the present species and that which I formerly described as 

 Hamingia ijimai. The question of classification will be 

 more fully discussed later. The following contribution, 

 though brief and incomplete in many points, is produced 

 with the hope of adding something to our present knowledge 

 of the group of Bonellidaj. Before going further, I wish to 

 express my deep gratitude to Professor J. Stanley Gardiner, 

 F.R.S., and Mr. A. E. Shipley, F.E.S., through whose great 

 kindness and generosity I have been enabled to produce the 

 present study, being supplied with every necessary con- 

 venience of the laboratory. I also feel greatly indebted to 

 Mr. S. Takahashi for his kindness in supplying me with the 

 prompt information for which I troubled him. 



ACANTHOHAMIKGIA SHIPLEI (jl . g . et n. sp.). 



This unique specimen was taken, in January of 1909, from 

 the basin (the Okinose) of the Sagami Bay at a depth of 

 400 fathoms, the same locality from which Protobonellia 

 mitsukurii and Hamingai ijimai had been procured. 

 Fig. 1, Plate 10, represents the animal in the preserved state 

 and the natural size, the ventral side being turned upwards. 

 As is shown in the figure, the skin of the body proper was 

 seriously broken, on the left side, by a hook of the long line 

 with which the animal was caught. Through the wound 

 thus caused some loops, mostly torn, of the coiled intestine 

 protruded. The fact last mentioned has made it difficult or 

 almost impossible rightly to trace and identify different parts 

 of the entangled intestinal loops. The general measurements 

 of the animal are as follows : 



