V. '07. 11 



"Of the three pairs of body- wall scales, the two basal 

 ' ' scales have each a proximal process which passes round 

 "the side of the base laterally, but does not meet its 

 "fellow on the adaxial surface of the zooid. On the 

 " distal, abaxial side of these basal scales there is no over- 

 ' ' hanging part (seitwarts verbreiterte Dorsalpartie 

 ' ' welche uber der Seitenpartie dieser Schuppen vorragt) , 

 "as in S. Studeri, the scale being simply convex, as in 

 " S. dichotoma. The median scales are smaller than the 

 " others and have the same kind of constriction as in S. 

 " Studeri, but it is not quite so pronounced as it is in that 

 " species. 



"The buccal scales are very similar to those of S. 

 "Studeri. 



" The opercular scales exhibit considerable variation, 

 " but seem to be more bent inwards than they are in 

 " other species. They are all provided with well marked 

 " keels extending from the nucleus to the outer edge. In 

 " the large abaxial scales the keel is 0'45 mm. in height 

 " at the edge. 



" Allowing for some variation, the length of the 

 " abaxial scales (i.e., the abaxial scale and the four 

 " abaxio-lateral scales) is 1*2 mm. At the extreme base 

 "they are 0'6 mm. wide, but in some scales that 

 " are less bent than the others, they are as much as 1'2 

 " mm. wide at a level just above the base. The adaxial 

 " scale is about 0*75 mm. in length, and the adaxio- 

 ' ' lateral are intermediate in size between the adaxial and 

 "the others. In the character of these opercular scales 

 " our species approaches S. Studeri in the size of the keel 

 " and S. dichotoma in the relatively large size of the 

 " adaxial scale. 



' ' As regards the scales of the coenenchym it is difficult 

 " to give in a few words any idea of the extraordinary 

 "range in size, shape, and character of the coenenchym 

 " scales in S. Versluysi. 



" On boiling a piece of the coenenchym in 5 per cent. 

 " K.H.O. for a little while large flakes are formed that 

 " may have a length of 1 mm. or more, but on further 

 "treatment these separate into scales not more than 0'6 

 "mm. in length. I have found it difficult to determine 

 "whether many of these scales, even after long treat- 

 " ment with potash, are not really compound. The 

 " coenenchym scales of S. dichotoma and S. Studeri are 

 "of an elongated form, and those figured by Versluys are 

 " spindle-shaped in outline. Such spicules are also 

 "found in S. Versluysi, but by far the greater number 

 " are much broader, and a great many are as broad as 

 " they are long. Many of the scales are oblong, square, 

 " leaf -shaped, stellate and quite irregular. As in other 

 " species, many of these scales are provided with a dis- 

 " tinct keel. In a criticism of Eoule's identification 



