498 MESSES. T. E. JONES AND T. CHAPMAN ON THE 



(broken) far apart and irregular. In another ' (40) two circles 

 of small holes and one broken tube remain in eyidence. 



Amongst examples in which the style of outgrowth is mixed, 

 one (62) has a single circle of subapical holes (equivalent to lost 

 tubules), but these are associated with scattered and exogenous 

 patches, and sinuous rows of holes disposed over the general 

 surface. The bases of some strong cervical tubes exist in 

 another (60), together with an apical growth. These specimens 

 indicate the existence of the suhapical kind of growth ; but show 

 also that it becomes mixed with other conditions. 



III. Mstulose growths on the general surface; variable in 

 extent. — The outgrowth in some examples (42) is very redundant 

 and somewhat obscures the form of the initial Polymorphine 

 series. The specimen 43 is a good example of tubular fistulose 

 outgrowths disposed over the general surface and with some 

 apical tubes more limited in extent. In another form (46) the 

 outgrowths have a tendency to become lateral and are more 

 or less flattened. Short thick tubules, uot at all confluent at 

 their bases, scattered over all the surface, in 47, characterize 

 apparently a distinct variety. 



TV. Marginal outgrowths. — The simplest example of marginal 

 growth, is 48, showing a double series of perforations along one 

 edge and the base of the shell, whence doubtlessly outgrowth 

 had, as it were, taken root, the sarcode having been extruded 

 through the shell to form calcified processes. The exact con- 

 dition of this fistulose growth is indeterminable. 



A good marginal growth, chiefly at the oral end, on one side, 

 and at the base, in 49, has a somewhat racemose edge ; and 58 

 has a more continuous and more racemose marginal expansion. 

 Still more freely branching is the marginal investment of 53. 



A simple marginal wing, nearly flat or merely undulose, 

 belongs to the attached form, JPoli/morphina concava, W^illiaxason, 

 54. A similar form is 56, but the flange shows indications of 

 the septation of the shell being continued in it ; and the edge 

 in this instance is more or less dentate. 



In the coarsely tubulated marginal outgrowth of 57 (unfortu- 

 nately broken), we have a somewhat difierent condition of this 

 kind of growth, less confluent than in others. 



