178 Transactions of the Royal Microscopical Society. 
vigorously, and Campylodiscus clypeus with a mucous fringe appa- 
rently protruded from the caniculi ; this fringe, like the horns of 
Orthoneis, is analogous to the stipes and fronds of Cocconema, 
Scliizonema, &c. It seems to me to be better to restrict the genus 
Mastogloia to those forms where the loculi are distinct, and consti- 
tute a new genus for those species with ovate or naviculoid valves, 
and of which the loculi form an integral part, or include them all 
in Orthoneis. — F. K.] 
Amphora. 
A. decussata Grun. A. (complexa?) valvis semilunaribus, acutis, 
ventre piano vel sub concavo et subbiundulata, dorso convexo, linea 
longitudinal i margini infer iori valvae valde approximata subrecta 
vel subarcuata, nodulo centrali transversim d ilata to, valvae parte 
ventrali angustissima transverse striata, parte dorsali oblique striata, 
striis ohliquis (16-18 in '01 mm.)e cellulis elongatis concatenatis 
compositis, valvae margine dorsali punctorum serie unica ornata. 
Longit. ‘07- ’17 mm., latit. valvae *018- '031 mm. Tab. 
CXCV., Fig. 9. Honduras, Adriatic Sea. 
Allied to A. ostrearia, but well distinguished by the very 
oblique striae composed of elongated puncta. 
A. hyalina Kg. var. ( = A. hemisphserica Grun., Hedwigia, 
l. c.), and A. cymbelloides Grun., are already delineated in 
Schmidt’s Atlas (tab. xxvi., figs. 52 and 53, and tab. xxvi., fig. 10). 
Navicula. 
N. triundulata Grun. N. valvis latiusculis trigibbis tumore 
medio ceteris majore et crassiore, apicibus productis obtusis, striis 
punctatis subradiantibus (10 in -01 mm.), utrinque sulcis tribus 
longitudinalibus interruptis. Longit. '014- -05 mm., latit. 
valvae ‘023 mm. Tab. CXCV., Fig. 10. 
Very rare, Honduras, Campeachy Bay. 
This form is perhaps the same as N. sulcata Grev. in ‘ Trans. 
Bot. Soc. Lond.,’ vol. viii. pt. 3, fig. 10, but not having seen an 
authentic specimen I am unable to decide. 
N. fusiformis Grun. {Berkeley a fusidium Grun. in Hedwigia, 
l. c.). N. fusiformis valvis lanceolatis acutiusculis, nodulis termina- 
libus minutissimis, nodulo centrali minuto plerumque aegre con- 
spicuo, striis transversis tenuissimis: 33 in '01, longitudinalibus 
36 in ’01. Longit. 115-’15 mm, latit. valvae '010 mm. 
Tab. CXCV., Figs. 11, a, 11, h. Honduras. 
N. fusiformis var. ostrearia (Turpin) minor, striis transversis 
36 in -01 mm. Longit. , 063-'073 mm., latit. valvae -006--007 
mm. Tab. CXCV., Fig. 12, a, 12, l . — Vibrio ostrearius Gaillon 
(1820). Navicida ostrearia Turpin, in ‘Diet, d’hist. natur,’ 
Levraubt II., tab. i., fig. 2 {nec Brebisson in Kfitz. * Spec. Alg.’). 
