28 THE APODOUS HOLOTHTJKIANS 



would have been possible to distinguish at least two species, but at present such 

 division would be hazardous and of no advantage. 



CHIBIDOTA KEGALIS, sp. nov. 

 (regalis, royal; in reference to the color.) 



Similar in general appearance to discolor, but distinguishable at once by 

 the purple color. In some specimens the color is pale, but in most it is quite 

 deep, and in some it is a rich royal purple. The wheel-papillae are rather 

 numerous, but are confined almost wholly to the mid-dorsal inter ambulacrum, 

 although anteriorly a very few may occur in the lateral interambulacra. Aside 

 from the color, this handsome species differs from discolor and Icevis in the pres- 

 ence of C-shaped deposits along the ambulacra. These deposits are similar to 

 those shown in figure 27, plate vn, and seem to be constantly present, although 

 not always abundant. They are not confined to the area of the longitudinal 

 muscles, but occur in the skin along each side of that region. The largest of 

 the specimens in the collection is upward of 200 mm. long. 



26 specimens from "Albatross" Station 3695, south coast of Honshu Island, Japan, 198-428 m. 

 3 " " " " 3737, Suruga Gulf, Honshu Island, Japan, 290-300 m. 



26 " " 2 stations. 



CHIEIDOTA LJEVIS (Fabricius). 



Of the more than 400 Chiridotas remaining, there are some which are very 

 clearly representatives of Fabricius 's species, but there are others which are 

 quite different, although there are numerous connecting examples. The condi- 

 tion of the specimens makes a careful separation of species out of the question. 

 There are, however, 4 sorts of individuals which are fairly recognizable, 

 though not always so. The typical form is small, soft, pinkish, more or less 

 translucent, and has the wheel-papillae in 3 rows dorsally, with some scattered 

 ones anteriorly on the ventral interambulacra. These are from water 5 or 7 

 m. deep, between Nantucket Island and High Duck (Grand Manan), off the 

 Atlantic coast of America. Others resemble these in the arrangement of the 

 wheel-papillae, but are much larger and are cream-colored or light gray; they 

 are from the Bay of Fundy, Labrador, and Anticosti. Still others have the 

 body-wall generally stiffer, and the color is more or less dirty brownish. These 

 are all from the Pacific coast of America, and may prove to be a distinct 

 species from those of the North Atlantic. The fourth sort are similar to the 

 latter, but have the wheel-papillae in a single row. They are also all from the 

 North Pacific. Since the Atlantic forms answer well to Duncan's and Sladen's 

 description of Fabricius 's species, I feel justified in calling them Icevis, and 

 as I am not able to find any constant distinguishing characters, I have re- 

 ferred all of the following specimens to that species : 



