436 Mr. W. G. Ridewood on 



been received from Prof. W. C. IM'Intosli in a collection of 

 specimens taken over from him by the Museum. In the 

 letter that accompanied the collection Prof. M'Intosh 

 writes : — " There are also some annelids, a few of which 

 require working up, a Cephalodiscus? from Kerguelen, and 

 sundry other tilings." The original 'Challenger^ label on 

 the bottle bears the words " Kerguelen, 20-60 fms." in ink, 

 and in pencil, in Prof. M'Intosh's handwriting, " Cephalo- 

 discus? and a curious Polyzoan.^' The Polyzoan, which is 

 attached to the coenoecial tubes of the Cephalodiscus, is, I am 

 informed by Sir Sidney Haimer, probably Beania ma- 

 geUanica. 



This second bottle has a capdclty of 70 c.c. only, and the 

 eight fragments that it contains are all small. Judging from 

 the difference in the records of the depth — 20-()0 fatli. on 

 this bottle, and 25 fath. on the larger bottle — it would seem 

 tliat the two lots of material did not come up in the same 

 dredging; indeed, it is possible that they were not obtained 

 on the same day, for the ' Challenger ' remained off Kerguelen 

 Island for three weeks. 



Of the two best pieces in the larger bottle, shown on 

 PI. XII., the larger (B) measures about 57x44x30 mm. 

 The coenoecial tubes vary from 20 to 45 mm. in length, and 

 have a uniform internal diameter of I'O mm. Tlie external 

 diameter of the upper parts of the tubes that stand out 

 freely, and are not connected by common coencecial substance, 

 is 1*6 or 1*7 mm. Some of the tubes are bulbous at their 

 lower, blind ends, the greatest diameter observed in a bulb 

 being 1*4 mm. The long tubes show a few concavo-convex 

 septa, irregularly disposed, but confined mainly to the lower 

 ends. The extent to which the free part of a tube stands out 

 from the common coenoecial substance varies considerably, 

 mostly within the limits of 10 and 30 mm. Sand-grains 

 occur embedded in the walls of the tubes and in the common 

 coencecial substance. 



The upper ends of the tubes differ from those of Cephalo- 

 discus densus dredged by the ' Terra Nova ' in occasionally 

 showing a lateral lip. The majority of the tubes resemble 

 those represented in the accompanying text-figure, a and b, 

 and have the terminal ostium transverse or oblique, without 

 any marked lateral extension ; in this respect they resemble 

 the tubes of the 'Terra Nova' material (i6, p. 42, text-fig. 4), 

 although there is a larger proportion of strongly oblique ostia 

 than in the latter. But some of the tubes have a laterally 

 extended ostium (text-fig., c), or a tongue-shaped lateral 

 process (g-), or even a funnel-sliaped ostium (d). A peculiar 

 feature, represented in the text-figure, e, f, g, suggests that in 



