HOWE 



PLATE 4 



Fin. 1. ArchcEolithothamnium affine, n. sp. Photograph of the free type specimen, from Car- 

 lisle marl pit. Antigua (T. W. Yaughan, Station Xo. 6873); slightly enlarged (V) 



FIGS. 2 to 4. LithophyUum (.') molarc, n. sp. (2) Photograph of all of material from north 

 side of Willoughln- Hay, Antigua (T. W.Vaughan, b from Station Xo. 6,ssl) : .-lisrhtly 

 enlargecl (-]). (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 diameter-. 



