All the individuals were taken in shallow water near the shore or on reefs and many 

 w ei mpanied by the tube which they inhabited and which had the usual appearance and 



composition. 



The column is elongated PI. I. fig. ;• and of the usual Cerianthan form, tapering 

 rally, where il is provided with a terminal pore, and flaring out somewhat al the margin, 

 upon which the marginal tentacles are situated. rhese are numerous and rather slender and 

 ed in four cycles at the margin of the funnel shaped disc. h was not always easy 

 to distinguish between the third and fourth cycles, but where this could be done the arrange- 

 ment was found to be 



— | 1,3, 2,4 [,3,2,4 i. 3, 1- 2, |, 3. ' 4, -• 3i ' 4. -■ 3. i I — ■ 

 The labial tentacles were somewhat shorter than the marginals and appear to have an arrange- 

 ment that may be represented thus 



■vi-.ii->->->! > ï 2 2 2 I 2 L2 32A3I2 



Kwietniewsk] describes the marginal tentacles as arranged in three cycles, but finds 



• in the case of the labials. 



Dimensions. — Different individuals varied considerably in their dimensions. In the 

 two examples trom Station [72 .(preserved in formalin) the column measured in the one case 

 io.; cm. and in the other case 8.5 cm. in length, the diameter at the margin being in each 

 e 2.2 cm. Other individuals (preserved in alcohol) ranged between 15.0 and 4.7 cm. in 

 length, proportionate differences also occurring in the diameters; the measurements of the in- 

 dividuals from Station 172, given above, probably represent a fair average. 



The tentacles also present a good deal of variation in length. The marginals were in 

 most individuals about 2.0 or 2.5 cm. in length with a diameter at the base ot trom 1 .0 to 

 1.5 mm., although in some cases they reached a length of 4.0 cm.; the labials were some- 

 what shorter, measuring as a rule about 1.5 cm. in length. 



Colouration. The column is of the usual purple-brown colour, varying from a 



very pale to a very deep shade. I he marginal tentacles frequently show traces of a brownish 

 louration, deeper toward the tips, while the labials are of a light greenish-yellow colour. 

 Structure. — In its histological features the column wall presents no special peculiarhi 

 The muscle lamellae for the ectodermal muscles, are from 0.4 to 0.6 mm. in height, and are 

 m^re widely separated than usual. about eighl occurring in each o.i mm. of a section taken 

 ai the leve) of the lower border of the stomatodaeum. A section of C. sulcatus taken at the 

 same level showed about 14 lamellae in the same distance and one of C. americanus about 17. 

 These differences may, however, be due in part or in whole to differences in contraction. The 

 muscle lamellae of the tentacles are noticeably better developed than usual. those ot the marginal 

 being about 0.02 mm. in height, while those of the labials are somewhat lower in 

 ith the lesser size of the tenta. Ii 



ing the column by a longitudinal incision the stomatod. ium is seen to hav< 

 about 1 cm. and to be provided with a well marked siphonoglyph. Throughout the 

 of its the ectoderm is thrown into well marked folds, each ot which is 



