HOWE 



PLATE 4 



FIG. 1. Archceolithothamnium affine, n. sp. Photograph of the free type specimen, from Car- 

 lisle marl pit. Antigua (T. W. Vaughan, Station No. 6873); slightly enlarged (V). 



FIGS. 2 to 4.Lithophyllum (?) molare, n. sp. (2) Photograph of all of material from north 

 side of Willoughhy Bay, Antigua (T. W. Vaughan, b from Station No. 6881) ; slightly 

 enlarged (f ). (3) Photograph of part of an obliquely transverse section of a large 

 branch, enlarged 44 diameters. (4) Photograph of part of a radio-longitudinal 

 section of same branch, showing perithallic cells, etc., enlarged 100 diameters. 



