286 MESSRS. W. WEST AND G. 8. WEST ON 
The specimens agreed exactly with those originally described, 
and from the present state of our knowledge of this type of 
Pleurotenium, it is impossible to say whether this species, 
Docidium verrucosum, Bail, and Pleurotenium tessellatum, 
Lagerh., are identical or not. The figures and descriptions of 
Docidium verrucosum and Pleurotenium tessellatum are not suff- 
ciently accurate to admit of a detailed comparison, but they 
agree in having the rectangular markings more numerous and 
regularly arranged, a character which, if correct (and this is very 
doubtful), readily distinguishes them from P. trochiscum. Only 
an examination of the original examples of Docidiwm verrucosum 
and Pleurotenium tessellatum can definitely determine the point. 
X. TRIPLOCEROS, Bailey. 
37. T. veRTICILLATUM, Bail. 1851.—Docidium verticillatum, 
Bail. in Ralfs, Brit. Desm. p. 218, t. 35. f. 9 (1848). 
Lat. 45-47 p. 
Hab. Laconia, N.H., common (H. J. no. 649). 
“ All the specimens seen were characterized by having but two 
bidentate projections at each end.” 
38. T. @RACILE, Bail. 1851; Nordst. in K. Sv. Vet.-Akad. 
Handl. xxii. no. 8, p. 64, t. vii. f. 12.—Docidium gracile, 
Wittr. in Nov. Act. Soc. Upsal. Ser. III. vii. p. 21, t. 1. 
f. 10. 
Lat. 20-26 y. 
Hab. De Land, Florida, occasional (H. J. no. 576). Laconia, 
N.H., occasional. 
“ All the specimens seen had two bidentate processes at each 
end. This is of interest in connection with the fact that all the 
specimens of T. verticillatum (which were abundant) showed the 
same peculiarity. Are these two species really distinct ? " 
XI. EUASTRUM, Ehrenb. 
39. E. nuwEnosuw, Ralfs, Brit. Desm. p. 82, t. 13. f. 2. 
Long. 104 u; lat. 76 p. 
Hab. De Land, Florida, frequent (H. J. no. 595). 
“ More like Ralfs’ figures than Wolle's." 
Var. Mammosum, Schmidle, in Ber. der Naturfor. 
Freiburg, vii. Heft 1, p. 106, t. 6. ff. 9, 10. 
Long. 100 p; lat. 60 u. 
Hab. De Land; Florida (H. J. no. 552). 
Ges. zu 
