REMARKABLE SPECIES OF ECHIUROIDS. 23 



question. The one is much hirger and more elongated than the 

 other and exhibits finely granular contents which stain deeply 

 with hœmatoxylin. The same glandular cells occur also on the 

 dorsal side of the proboscis (fig. 45). They are apparently the 

 same as the similarly situated unicellular glands, known to occur 

 commonly in other Echiuroids. The second variety of the glands 

 is characterized not only by being shorter but also by having an 

 almost homogeneous plasma containing some coarse granules which 

 are intensely stained by eosin or erythrosin. So far as I know, 

 this kind of the glandular cells has never yet been described 

 from other Echiuroids. The cutis (figs. 26-28, cts.), the meseu- 

 chymatous layer directly underlying the epidermis, is compara- 

 tively thick. It attains greatest thickness in dermal papillœ, of 

 which it in fact forms the main internal mass. The tissue 

 consists of a clear ground-substance which is traversed by numer- 

 ous, irregularly branching fibers, as in a fibrous connective tissue. 

 Most of the fibers take a course vertical to the body surface. 

 Here and there the fibers are seen to emanate from the ends 

 of slender spindle-shaped cells, of w^liich they seem to be direct 

 prolongations. The same connective-tissue cells and fibers occur 

 also in deeper parts of the body-wall among the muscle fibers. 



In the cutis and especially numerously in its superficial parts 

 are met with some nerves and ganglion cells, of which mention 

 was already made. Inclosed in the layer are further peculiar 

 pigment bodies {pg.). They are of a spherical shape, and contain 

 innumerable minute granules of a brownish color. They occur 

 most abundantly in the deeper part of the cutis and in the 

 non-papillated region. There is another sort of pigment-like 

 bodies {pg'.) which are found most abundantly in the peripheral 

 parts of the cutis. They are of various sizes, are quite homo- 



