158 MESSRS. W. WEST AND G. S. WEST ON 
Genus XANTHIDIUM, Ehrenb. 
196. XANTHIDIUM ACANTHOPHORUM, Nordst. in Act. Univ. Lund. 1880, xvi. p. 11, 
t. 1. fig. 20; inclus. X. acanthophorum, var. bengalicum, Lagerh. in Bih. K. Sv. Vet.- 
Akad. Handl. 1888, xiii. Afd. 3, no. 9, p. 9, t. 1. fig. 7. 
Long. sine spin. 40-464, cum spin. 54-57-54; lat. sine spin. 33-39 4, cum spin. 
42—46 u; lat. isthm. 10-11:5 y. 
Hab. Paddyfields, Heneratgodha.  Paddyfield between Kosgoda and Urahaighas- 
mahendai. 
The scrobiculated area in the centre of the semicells is very large, and the disposition 
of the serobiculations very variable, bardly any two specimens having the same arrange- 
ment on the two semicells of the same plant. Thus, the var. bengalicum, Lagerh., 
cannot be considered as a form in any way differing from ordinary typical examples. 
137. XANTHIDIUM FREEMANII, sp. n. (Pl. 20. fig. 28.) X. submagnum, paullo longius 
quam latum (sine spinis), subprofunde constrictum, sinu lineari extremo ampliato ; 
semicellulee depresso-semicirculares, apicibus truncatis rectis, angulis basalibus 
rotundatis, margine laterali unoquoque serie spinarum acutarum subcurvatarum 
9 przeditis, et serie spinarum similium 9 intra marginem, apicibus glabris; membrana 
dense et minute scrobiculata, in centro semicellularum..... ?; a vertice visa 
elliptic, cum.....?... utrobique, polis rotundatis spinis 4 instructis. 
Long. sine spin. 804, cum spin. 89,4; lat. sine spin. 734, cum spin. 824; lat. 
isthm. 34; long. spin. circ. 4°8-5°7 u. 
Hab. Paddyfields, Heneratgodha. 
We regret that we cannot give a more complete description of this characteristic 
Xanthidium, which presents very little resemblance to any other species of the genus. 
The cell-wall was minutely scrobiculate, but the nature of the central tumour could not 
be made out, neither were the other views obtainable. There are four subparallel series 
each of nine spines arranged along each lateral margin from the basal angle to the side 
of the apex. 
138. XANTHIDIUM BREVICORNE, W. B. Turn. in K. Sv. Vet-Akad. Handl. 1893, xxv. 
no. 5, p. 101, t. 13. fig. 9. 
Var. CEYLANICUM, var.n. (Pl.20.fig. 27.) Var. cellulis profundissime constrictis, isthmo 
angustiore et sinu apertiore; in centro semicellularum incrassata cum annulo 
scrobieulorum parvorum 6; spinis longioribus. 
Long. (sine spin.) 51,4; lat. sine spin. 43,4, cum spin. 494; lat. isthm. 1454; 
crass. 24 u; long. spin. 8°2-3'8 u. 
Hab. With the preceding species. 
139. XANTHIDIUM CEYLANICUM, sp. n. (Pl 20. figs. 24, 25.) X. parvum, circiter 1}-plo 
longius quam latum, profunde constrictum, sinu angusto-lineari extremo ampliato ; 
semicellulæ rotundo-pyramidatæ, angulis basalibus rectangularibus, lateribus con- 
vexis serie spinarum 5-6 instructis, spinis multe majoribus apicem versus, apicibus 
