New Diatoms from Honduras. Described by A. Grunow. 181 
B. interrupta (Kg.) = Baphidogloia Kg. frustules somewhat 
sigmoid. 
B. Harveyana Grun. Novara Exp., Alga quasi maxirne para- 
doxa. Harvey, Friendly Islands, Algae, No. 99. 
B. penicillata (Grun.) ( Homoeocladia penicillata Kg. ?). 
B. hospitans (Grun. n. sp.). B. parasitica, frustulis minutis, 
valvis lineari oblongis, acutiusculis, nodulo centrali elongato aegre 
conspicuo leviter arcuato, striis transversis tenuissimus. Longit. 
•12- ’023 mm., latit. valvae '003- '004, habitat, in vaginis Hydro- 
colei tingentis. Tongatabu (legit Dr. Graeffe). PI. CXCV., Fig. 16. 
Schizostauron Grun. genus novum. 
Frustula naviculacea, valvis lanceolatis vel ovatis, nodulo centrali 
transversim dilatato, in utroque fine befido. 
S. Lindigii Grun. S. valvis late ovalibus, linea media subsig- 
moidea, utrinque inter polos et nodulum centralem dilatata, nodulo 
centrali transversim dilatato, lineari in utroque fine bifurcato, ramis 
elongatis patentibus, recurvis (cum margine fere parallelis (striis 
transversis tenuissimus (36 in * 01 mm.). Longit. * 029 mm., latit. 
valvae ' 021 mm. Valva exsiccata hyalina ecolora. Tab. CXCV., 
Fig. 17. Very rare in the Honduras gathering. 
S. Beichardtii Grun. S. valvis ovato lanceolatis pobs param 
productis, obtusiusculis, linea media recta lineari, fascia transversa 
utrinque befida, ramis arcuatis divergentibus, striis transversis subti- 
liter punctatis, subrad i antibus 12 in '01 mm. Longit. ■ 26- • 036 
mm., latit. valvae - 16- - 19 mm. Tab. CXCV., Fig. 18. 
Adriatic Sea near Lussin piccolo (leg. Dr. Reichardt) on Codium 
bursa from Dalmatia (leg. Dr. Bartach). I have seen single speci- 
mens of two other species. Cocconeis Wrightii, O. Meara, ‘ Q. M. J.,’ 
vol. vii., n. s., pi. vii., fig. 6, is without doubt another species of that 
genus. 
Bhoicosigma Grunow. 
Frustula plus minus spiraliter torta valvae illis Pleurosigmatis 
similes. 
This genus is perhaps not sufficiently distinct from Pleurosigma, 
but the species belonging to it are of a very peculiar habit, in front 
view resembling an Achnanthes. 
Bhoicosigma Beichardtii Grun. Valvis late lineari lanceolatis 
obliquis convexis, linea media subrecta, striis transversis tenuibus 
(20-24 in • 01 mm.) longitudinalibus obsoletis. Longit. ’77- 
•18 mm., latit. valvae *14- ’034 mm. Tab. CXCV., Fig. 19, a, b. 
Honduras (legit Lendig), Quarnero (legit Dr. Reichardt), Port 
Jackson (legit Cleve). The Quarnero specimens are larger than 
those from Honduras. 
B. Beichardtii var. ? constrictum Grun. differs from the type 
o 2 
