ACTINOrODOUS HOLOTHUEIOIDEA. 147 



bis an die aussersten Enden der feiuston LunL^cnastclicn hinaiif. 

 Die Kalkkorpoi- ahiilich denen von //. ai'gus Jaeger." (SEJirEE, 

 p. 80). 



Jh'marhs : — The specimen which I examined during Hfo had 

 tlie following coloration. On the dorsum, a very broad longitudinal 

 l)and (if liglit 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 that color. Toward the 

 sides the yellow gradually shaded into white, whicli was the 

 color of the ventrum. Within the yellow band of tlie 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 within the yellow area. Toward 

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

 the ventrum, there was no pigment around the ambulacrol 

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

 animal is of a light brown, somewhat but iiot much darker in 

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

 around the dorsal papillae are still somewhat visible. 



There is no shai'p distinction between the dorsum and the 

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

 pedicels on the latter. Microscopic examination shows that some 

 dorsal ambulacral appendages have liardly 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 

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

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

 gi'oups of small papilla?. The internal eloacal wall is dark colored. 



The calcareous deposits are rosettes resembling those of //. 

 argus, H. mannorata, etc. In the present specimen, those of the 



