280 J- Playfair McMtjrrich, 



furnished with numerous small tubercles arraüged more or less 

 distinctly in closely set longitudinal rows, except for a short distance 

 above the base where they are either lacking- or are disposed 

 irregularly. At the junction of the upper and second fifth of tlie 

 column, however. the majori ty of the rows suddenly cease. only 

 fourteen extending- further, and of these alternate rows, composed 

 of smaller tubercles, do not extend as far up as the other seven. 

 The longer rows correspond with endocoels of the primary mesenteries 

 and the shorter ones to those of the secondary mesenteries. In the 

 contracted specimen the various rows are distinctly separated from 

 their neighbours by narroAV grooves and all reach the limbus. The 

 majority stop a short distance below the summit of the contracted 

 column, those which are continued upon it being apparently sixteen 

 in number and are alternately longer and shorter, the upper ends 

 of the longer ones being infolded, so that their füll length cannot 

 be Seen. 



At first sight it seemed as if the scapus ended where the majority 

 of the rows of tubercles ceased and that the primary and secondary 

 rows were continued upon the capitulum. A faint ridge, however, 

 occurs just distal to the extremities of the primary rows and above 

 tliis is a narrow area which seems to be the true capitulum since 

 it alone is destitute of a cuticle. In the lower four-fifths of the 

 scapus the cuticle is very distinct and contains foreign particles 

 imbedded in it. In the region where the primary and secondary 

 rows alone occur it is very thin and lacks imbedded material so 

 that it cannot readily be distinguished on surface view except over 

 the tubercles where it is well marked. This thin cuticle extends 

 distally as far as the ridge mentioned as occurring above the 

 extremities of the primary rows of tubercles, but beyond this is 

 wanting. The capitulum is quite smooth ; it is to be noted that in 

 extreme contraction the upper part of the scapus as well as the 

 capitulum is inverted. 



The tentacles are rather short and obtuse and possess no bulbous 

 enlargements at the base. They are arranged in about four cycles. 

 The disc is smooth and the stomatodaeum is longitudinally ridged 

 and possesses two siphonoglyphs. 



The column of the expanded individual measures 2.7 cm in 

 height and about 1.2 cm in diameter; the contracted one has a 

 height of 2.0 cm, a diameter at about the middle of the column of 

 2.5 cm and at the base of 1.2 cm. 



