62 



T. IKEDA : 



Sea (5° 44' 7" S and 126 27' 3" E). The new species, to lie pre- 

 sently described, comes from a depth (500 fathoms) intermediate 

 between the above two. For it I propose the name Hamingia ijimai 

 in honor of Professor Ijima of the Tokyo Imperial University. 



Hamingia ijimai nor. sp. 



The animal in the preserved state (Fjg. 1) measures about 160 mm 

 in total length, of which 60 mm. form the length of the proboscis. As 

 is seen in the figure, the body proper is preserved in a somewhat 

 unnatural state, the anterior half being considerably contracted, while 

 the postior half is abnormally distended. According to the collector's 

 remark, the animal when alive was of a bright yellowish red color, a 

 faint trace of which is still preserved in the alcoholic specimen. The 

 integument is thin, translucent and quite smooth, except on the pro- 

 boscis and in the contracted region of the body. It is devoid of any 

 sort of papillary structures and of hooks. 



About (S mm. behind the funnel-shaped mouth lies a small pit, 

 situated at the posterior end of a narrow groove running from the 

 posterior cleft of the mouth and along the median ventral line (see 

 Fig. 1). This is the external opening of the single oviduct. The 

 anus lies at the usual position, i.e., at the apex of the conical hind 

 region of the body. 



The proboscis is relatively long and slender, measuring, when 

 straightend, 60 ;/////. in length and 6 mm. in width. The organ 

 was in the living state, as I was told, at least twice as long as it is 

 now, and was performing an incessant undulatory movement recalling 

 that of Thalassema taenioides? It terminates rounded at the anterior 

 end and has a deep groove along the entire length of the ventral side. 



The alimentary canal winds and twists in a very complex way 



I. Ikeda, I.,— On Three New and Remarkable Species of Echiuroids {Bonfllia miya- 

 jitnai, Thalassema taenioides and T. elegans) : Journ. Coll. Sci., Imp. Univ., Tokyo, Japan, 

 Vol. XXI, Ail. S, 1907. 



