34 Transactions of the Society. 



The polyps are disposed over about three-fourths of the surface 

 of the colony, leaving a bare longitudinal track which is very 

 marked in the lower part, but almost disappears m the upper 

 portion The verrucas are small, elongated and slightly club- 

 shaped ; they are about 2-5 mm. long and 0-25 mm. in diameter, 

 and are much more openly disposed than in the other species 

 (pi XIII. fig. 6a). Fiu. 66 sliows the appearance from the nou- 

 polvp-bearing aspect. "" The tentacles are first infolded and then 

 withdrawn into the upper part of the verrucfe, but the verrucce 

 themselves are not retractile into the coenenchyma. The colour of 

 the ccenenchvma is orange-red, but the verruc« are almost white. 



The spicules of this species are extremely irregular in^form, 

 but the following types may be distinguished (pi. XIII. tig. 7) :— 



1. Short sliglitly warty spindles. (0-07 X 0-015.) 



2. Spindles longer and more warty. (O-Oy x 0-038; 0-08 



X 0-038.) 

 3 Spindles still longer and more warty. (0-13 x Q-O.^; 

 0-14 X 0-046; 0-16 X 0-065; 0-2 X 0-06.) 



4. Very irregular forms (probablv developed from [3]). (0-17 



X Oil; 0-16 X 0-13.) 



5. Flat, UTegular scales. (0-14 X 0-09.) 



6. Thick, wartv, almost spherical forms. (U - 06 X - 045 ; 



0-053 X 0-034.) 



7. Crosses (aberrant). (0-12 X 0-11.) 



Locality:— T^edi Cliff, S. of Morewood Cave, N.W. | N. 

 6^ miles. Natal. Depth, 37 fathoms ; bottom, sand and shells. 



Position of Micksonella. 



In this connexion the axis stands first to be considered. As 

 mil be seen from the descriptions of the various species, it is com- 

 posed of concentric laminiP ; these laminae consist of a horny sub- 

 stance containing some form of calcareous deposit. It has been 

 impossible so far to determine the nature of this limy deposit, but 

 it is hoped that some solvent may be found to decompose the 

 organic matter, and so enable a microscopic examination of the 

 inorganic residue to be made. UntH this is done, however, deter- 

 mination based on axial structure is impossible. We have, how- 

 ever, in our Eevision of the Juncellids, discussed the possible 

 affinities of several other specimens whose axis is similar to the one 

 under consideration, and the resemblance strongly suggests that 

 the present specimens approach closely to the Gorgoiiellidae, to 

 which family we would therefore temporarily assign them. 



In the work cited above, after an exhaustive examination of a 

 very large numl)er of .JuncelUds, we suggested an emended classifi- 

 cation, and included in the genus Juncclla only those species whose 

 spicules contained the type known as "clubs." This type of spicule 



