HOWE 



PLATE A 



Fig. 1. — Archccolithothamnium affine, n. sp. Photograph of the free type specimen, from Car- 

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



Figs. 2 to 4. — Lithophyllum (.') molarc, n. sp. (2) Photograph of all of material from north 



side of Willoughby Bay, Antigua (T. W. Vaughan, b from Station No. 6SS1) ; 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 



..„;. -, _. -. ....„..:_ __„_..■— x perithallic cells, etc., enlarged 100 diameters. 



