150 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [lloltithurians. 



irregular longitudinal rows on each of the three radii, witli a few in the interradii. 

 The integument is thick, hard, and leathery. 



There are 10 copiously branched tentacles, of which the 2 ventral ones are 

 smaller than the others. The tentacle-branches are now white, but their stems, 

 and also the lining of the introvert, are still bright crimson. The calcareous ring is 

 short, and generally similar to that figured by me for C. calcarea, but it is difficult 

 to make out the exact shape and boundaries of the component pieces. The 5 radials 

 are bifid anteriorly, where the retractor muscle is attached, and notched posteriorly. 

 The 5 interradials are smaller and less conspicuous ; they appear to be very narrow, 

 and simply pointed anteriorly (a good deal narrower posteriorly than figured for 

 C. calcarea). 



Immediately behind the pharynx, containing the retracted tentacles, the ali- 

 mentary canal bears a short bulbous dilatation, the thick muscular wall of which 

 is thrown into deep longitudinal folds internally. Behind this dilatation, or 

 "stomach," the canal narrows suddenly, and then gradually widens again to form 

 the considerably convoluted intestine. The latter gradually narrows again towards 

 the rectum, which is greatly dilated and attached to the body- wall by very numerous 

 slender muscle-bands. The more anteriorly placed of these muscle-bands are long 

 and conspicuous, extending forwards for some distance in front of the rectum, and 

 attached to the body-wall, some radially and some at the sides of the longitudinal 

 muscle-bands. 



The respiratory trees open into the rectum close to its junction with the intes- 

 tine. They are long and copiously branched throughout their length, extending 

 forwards to the anterior end of the body-cavity. The 5 retractor muscles of the 

 pharynx are well developed. The chalky-white convoluted stone-canal is situate 

 dorsally, and a single large spherical Polian vesicle, with a short stalk, lies on 

 the left side, opposite to the left dorsal retractor muscle. Tube-foot ampullae are 

 abundant on the inner surface of the ventral body-wall, chiefly at the sides of the 

 longitudinal muscle-bands, but also extending into the interradial areas. There 

 are none visible on the dorsal body-wall, neither at the sides of the dorsal longi- 

 tudinal muscles nor in the mid-dorsal interradius ; which indicates that the papillae 

 of the dorsal surface are not really fully developed tube-feet, though they still 

 possess reticulate end-plates. 



There are 2 bunches of long unbranched genital caeca, of a deep-orange colour. 

 There are about a dozen in each bunch, of varying length, the longer ones being 

 nearly, if not quite, as long as the body. The 2 bunches are attached right and left- 

 of the dorsal mesentery, at about the level of the calcareous ring (the tentacles being 

 completely retracted). The gonads are thus very copious, and almost fill up the 

 coelom around the alimentary canal. The genital duct, as usual, runs forwards in the 

 dorsal mesentery from the point of attachment of the gonads. 



The spiculation is generally similar to that of C. hrevidentis (type). The thick, 

 knobbed, reticulate buttons (fig. 2a) are perhaps less numerous in proportion to 

 the other spicules, but they sometimes reach a very large size.* 



Small perforated cups with a row of projections around the margin and one 

 or two projections at the bottom are very numerous (figs. 2b-2g). These cups are 



None of those very larRe, knobbed buttcnis ur plates are figured. 



