NOTES ON A DEEP-SEA ECHIUROID. 137 



Length of proboscis (measuredasfullj stretched) 85 mm. 



Maximum breadth ot" proboscis ... 5 mm. 



Length of body proper . . . . .62 mm. 



Maximum breadth of body proper . . .22 mm. 



As regards the colour of the animal in the fresh state, 

 nothing could be ascertained beyond Mr. Aoki's statement 

 that it was of a pale yellow colour; a faint tinge of this 

 remained after preservation. 



To refer more fidly to the external morpliology of the 

 animal, the proboscis is of the usual shape, resembling that 

 of Hamingia ijimai. It is deeply and widely grooved on 

 the ventral side along its whole length. Near the anterior 

 end it becomes abruptly narrowed and ends rather pointedly 

 (fig. 2). I^owards the mouth the free margins come together, 

 partly overlapping each other, so as to form a funnel-shaped 

 passage directly leading to the mouth. The whole surface of 

 the organ is smooth, but with many minute wrinkles. 



Both extremities of the body proper are rounded. The 

 integument, which is rather thin and somewhat transparent 

 in the most swollen part of the body, is rather rough owing 

 to the presence partly of dense accumulation of skin-folds in 

 both terminal regions and partly of scattered papillary bodies 

 over the remaining parts. The skin-folds, which are about 

 O'l mm. thick, are arranged in irregular transverse rows 

 something like the leaves of a book. In fig. 1 some con- 

 spicuous folds (or more properly, grooves separating the folds) 

 are represented. Arising close to the mouth there is a light 

 and narrow mid-ventral grooveabout 10 mm. long, which begins 

 anteriorly with a narrow, streak-like fissure and terminates 

 posteriorly in a comparatively broad depression. This groove 

 is in my opinion of the same nature as that formerly described 

 by me in Hamingia ijimai. It might be named the genital 

 groove, since in both species it is practically concurrent with 

 the genital aperture, which is situated at the posterior angle 

 of the groove. 



No special papillas around the genital aperture, such as 



