40 PEOr. A. DENDY ON THE 



one or two more or less, as in figs. 44, 45. There are also mucb 

 smaller spicules (PI. 5. figs. 48, 49) of similar general form, but 

 concave on one side and with the knobs very small and irregularly 

 scattered. These doubtless represent the cups of the other 

 species of ColocJiirus ; they measure about 0'029 mm. in longer 

 diameter. Curved perforated rods (PI. 5. figs. 50-52) are alsa 

 abundant, especially at the bases of the tentacles and in tbe tube- 

 feet. The tube-feet and papillae are also provided with beautiful 

 reticulate end-plates. 



This interesting little Holothurian occurs not uncommonly on 

 seaweed in Cook Straits, near "Wellington, where it may be 

 collected at low tide. 



CoLOCHiEUS BEETiDENTis, Sutton, sp. (PI. 5. figs. 54-61.) 

 1872. Thyone brevidentis, Hutton, Cat. EcJiinoderm. N. Z. p. 16. 

 1886. Thyoue brevidentis, Theel, ' Challenger ' Holothurioidea, p. 141. 



The original description runs as follows : — " Cylindrical, rather 

 flatter below, and rounded at both ends ; papillate all over with 

 suckers, those on the back larger and farther apart ; tentacula. 

 ten, very short, of uneqiial length, triangular, frondose ; teeth 

 very short ; longitudinal muscles narrow, attached to the dental 

 apparatus. 



" Brown ; tentacles pink, with yellowish tips. 



" Rather more than an inch in length." 



Theel merely mentions the species ; and the only specimen 

 which I have seen is one belonging to tlie Wellington Museumy 

 doubtless Hutton's type. Unfortunately it is in a very bad 

 state of preservation. The tentacles and the whole of the viscera 

 had been removed, leaving nothing but the integument, in the 

 form of a dry and empty shell, shaped like a short, thick sausage. 



The integument is thick and hard, owing to the very abundant 

 spicules, and it is not corrugated. The smaller " suckers "' 

 observed by Hutton are doubtless tube-feet ; they occur thickly 

 and irregularly scattered over the ventral surface, except at the 

 anterior and posterior ends. The larger papillae, perhaps twice 

 the size of the retracted tube-feet, are abundantly and pretty 

 uniformly scattered over the remainder of the body ; they appear 

 to have retractile apices, and both tube-feet and papillae are 

 provided with well-developed reticulate end-plates. 



The spicules are very numerous, forming a dense crust in the' 

 integument. The most abundant and characteristic are the 



