ACTIXOPODOUS HOLOTHUKIOIDEA. 147 



bis an die äussersten Enden der feinsten Lungenästchen hinauf. 

 Die Kalkkörper ähnlich denen von //. argus Jaeger." (Sempee, 

 p. 80). 



Remarks : — The specimen which I examined during life had 

 the following coloration. On the dorsuui, a very broad longitudinal 

 band of light straw yellow extended from the anterior to the 

 posterior end, surrounding the large circular cloacal opening, so that 

 the largest part of the dorsum was of tliat color. Toward the 

 sides the yellow gradually shaded into white, which was the 

 color of tlie ventrum. Within the yellow band of the dorsum, 

 the dorsal ambulacral appendages had each a brown ring around 

 its base. The appendages themselves were clear and transparent. 

 The brown circles were confined witliin the yellow area. Toward 

 the sides, the brown changed to yellow. More laterally and on 

 the ventrum, there was no pigment around the ambulacral 

 appendages. In alcohol, the yellow color has faded : the whole 

 animal is of a light brown, somewhat but not much darker in 

 the place where the yellow was present in life. The brown rings 

 around the dorsal papillaß are still somewhat visible. 



There is no sharp distinction betw^een the dorsum and the 

 ventrum. It has been said there are papiUœ on the former and 

 pedicels on the latter. Microscopic examination shows that some 

 dorsal ambulacral appendages have hardly any or only very small 

 end-plates while others have well-developed end-plates. In life I 

 have noted that there is a band without pedicels on the median 

 Tentral line ; but this is not now apparent, as the specimen is 

 contracted in alcohol. The anus is circular, surrounded by five 

 groups of small papillœ. The internal cloacal wall is dark colored. 



The calcareous deposits are rosettes resembling those of //. 

 ^trgus, H. marmorata, etc. In the present specimen, those of the 



