176 Transactions of the Boyal Microscopical Society. 
lation of the new forms described in this paper, with copies of the 
figures, will be found in ‘ Grevillea,’ vol. i. p. 41, pi. ii., fig. 12 a, b). 
Valves lanceolate with obtuse apices: the marginal border of loculi 
(12-14 in ’01 mm.) more or less narrow, striae punctate very fine. 
Length •025-' 08 mm., breadth ’0057- ’ll mm. Eare in the 
Honduras gathering, Valparaiso, Tahiti, New Zealand, Polynesian 
Islands, Australia, Adriatic Sea, Ac. 
M. undulata Grun., ‘ Verb. Wien zool. hot. Gesellsch.,’ 1860, 
tab. vii., fig. 5. Honduras, Adriatic, Mediterranean and Red seas, 
Polynesian Islands, Australian seas, Seychelles, &c. This form 
cannot be Ceratoneis meleagris. as I at one time thought. The 
dots composing the striae (16-18 in '01 mm.) are oblong, and 
form coarse, irregularly undulating lines, ill. erythrsea has much 
finer striae and more crowded loculi, which are interrupted at two 
places by several loculi of larger size. 
Navicula Meleagris Kiitz. is perhaps identical with my Mas- 
togloia Braunii, a form by no means rare in the Baltic, but I am 
unable to say for a certainty to what species of Mastogloia, N. 
Meleagris of Kutzing from the eastern shore of the island of 
Jutland belongs. M. Braunii is well characterized by the longi- 
tudinal furrows near the median line, which resemble those of 
Navicula Lyra. W. Smith has confounded this form with M. lan- 
ceolata Thwaites, a form I could not find in a slide (from Lancing, 
in Surrey) determined by Smith himself. It contains a small 
variety of M. Braunii, with loculi sometimes enlarged, but no 
M. lanceolata. 
The latter form corresponding with Smith’s figure is by no 
means common. The striae on this species are not radiant near 
the apices, but slightly convergent towards the margins of the 
valve, and show no traces of longitudinal furrows near the median 
line. 
M. bisulcata Grun. n. sp. M. minuta, valvis late ovato lanceo- 
latis, polis parum productis obtusis, loculis latiusculis aequalibus 
5-6 in - 01 mm. Striis subradiantibus, subtiliter punctatis 10^ 
in '01 mm. utrinque area laevi lineari lanceolata subarcuata in- 
terruptis linea media undulata, nodulo centrali parvo oblongo. 
Longit. •017-'03 mm., latit. valvae •009- - 011. Tab. CXCV., 
Fig- 6 - . 
Not rare in the Honduras gathering. This species is very like 
M. minuta Grev. in outline, but differs widely by its much coarser 
striae and the two smooth furrows on each side of the valve. In 
the Honduras gathering occurs another Mastogloia, which I con- 
sider is the true M. minuta of Greville ; it is very like the 
preceding, but has a nearly straight median line, very fine sub- 
radiant transverse striae (25 in ‘01 mm.), still finer longitudinal 
striae, and no smooth furrows. PI. CXCV., Fig. 7. 
