184 : MESSRS. W. WEST AND G. S. WEST ON 
The remarkable nature of the processes of this Stawrastrum readily distinguishes it 
from any other. 
244. STAURASTRUM ACESTROPHORUM, sp.n. (PI. 22. fig. 3.) S. parvum, circiter (ESO 
latius quam longum (cum processibus), modice constrictum; semicellule late 
campanulatze, apicibus convexis, angulis superioribus in proeessus breves tenues 
horizontaliter dispositos productis, apicibus processuum 4-spinatis, margine superiore 
processus uniuscujusque verruca bispinata instructo, margine laterali sub processu 
unoquoque spina singula preedito; a vertice vise triangulares, angulis in processus 
breves productis, apicibus processuum 4-spinatis, processibus cum spina singula 
utrobique, lateribus leviter concavis denticulis distantibus duobus instructis. 
Long. cum spin. 23-25 p, sine spin. 17:5 w; lat. 25-27; lat. isthm. 5p. 
Hab. Paddyfields, Heneratgodha. 
245. STAURASTRUM CERASTES, Lund. in Nov. Act. Soc. Scient. Upsala, ser. 3, viii. 1871, 
p. 69, t. 4. fig. 6. 
Var. CEYLANICUM, var. n. (Pl. 22.fig. 4.) Var. minor, verrucis emarginatis cum 
denticulis ornatis, dente parvo infra basin processuum uniuscujusque, basi semi- 
cellularum truncato-inflata. 
Long. 388; lat. cum proc. 41; lat. bas. semicell. 12°54; lat. isthm. 8 p. 
Hab. With the preceding species. 
246. STAURASTRUM APPROXIMATUM, sp. n. (Pl. 22. fig. 5.) S. parvum, circiter 14-plo 
latius quam longum (cum processibus), modice constrictum ; semicellule subcam- 
panulatee, angulis superioribus in processus longos valde convergentes attenuatos 
delicatissime denticulatos productis, denticulis infra basin processuum majoribus, 
apicibus processuum tridenticulatis, apicibus semicellularum leviter convexis, serie 
verruearum emarginatarum ornatis, ad basin semicellularum verruca emarginata 
sub processu unoquoque; a vertice visse triangulares, angulis in processus longos 
delieatos undulatos productis, intra marginem unumquemque serie verrucarum 
emarginatarum instructe. 
Long. 32:55; lat. cum proc. 50 p, sine proc. cire. 125; lat. isthm. 5'5 p; lat. bas. 
semicell. 10 p. 
Hab. Paddyfields, Heneratgodha. 
This species may be compared with S. involutum, W. B. Turn. (in ‘ Naturalist,’ Nov. 
1893, p. 347; = S. eurvatum, W. B. Turn., 1892), but differs in the form of the semicells 
and in the much longer and more gracefully incurved processes. The base of the semi- 
cells is also quite different and the processes are more delicately denticulate. 
247. STAURASTRUM TRIFORCIPATUM, sp. n. (Pl. 22. fig. 6.) S. parvum, pæne duplo 
longius quam latum (sine processibus), leviter constrictum ; semicellule late 
cuneatz, apicibus subconcavis, angulis superioribus in processus longos graciles 
arcuatos et incurvatos productis, marginibus processuum delicatissime undulatis et 
