510 PROFESSOR GREGORY ON 
63. Amphora turgida, n. sp. Pl. XIL., fig. 63. Form nearly orbicular, with 
short, square, produced apices. Detached valves, nearly semicircular, with the 
vertical margin straight and the extremities capitate. Nodule conspicuous. 
Length from 0-001’ to 000-2’; breadth 0:008" to 0°0015’. Valve marked with 
somewhat coarse radiate strive. Strize 24 in 0-001’. 
This little form occurs in Lamlash Bay, but it is more frequent in one of the 
Loch Fine dredgings, which, though stony and unpromising in aspect, is yet sin- 
gularly rich in undescribed species, and especially in Amphore. The detached 
valves or halves of this species, which are like small and very convex Cymbelle, 
are much more frequent than the entire frustule. 
64. Amphora nana, n. sp. Pl. XIL., fig. 64. Form a narrow, linear-elliptie. 
Inner lines lying very near the ventral margin of valves, and nearly straight. 
Nodules small; near the ventral margin. Rectangular middle space very 
narrow. Length 0-001’ to 0:0016"; breadth 0:0004" to 0:0005". Strize about 50 
in 0-001’. 
This small species occurs with the last, and is tolerably frequent. 
65. Amphora macilenta, n.sp. Pl. XIL., fig. 65. Form elliptic, long and narrow, 
contracting towards the ends, which are again slightly expanded, and terminate so 
that it has very short, square, produced ends. Valves very slender, arcuate on 
dorsal margin, straight on ventral. Middle space narrow, with a strong median 
line. Length 0-0018" to 0:0022"; breadth of entire frustule 0-0005" to 0:00086". 
Strize parallel, rather coarse, about 30 in 0-001". 
This species occurs with the two preceding, and is not at all unfrequent. 
66. Amphora angusta, n. sp. Pl. XIL, fig. 66. Form nearly rectangular, or 
rather linear-elliptic, narrow, truncate at the ends, so as to form a slender and 
somewhat elegant barrel shape. The inner curve-lines arise in each half or 
valve from the outer angle, and meet in a nodule situated half-way across the 
valve. Both valves are transversely striated across, up to the narrow rectangu- 
lar space in the middle. Length 0:0015"; breadth of entire frustule 0-0004". 
Striz fine, about 44 in 0-001". 
This species occurs with the preceding ones, chiefly in the Loch Fine dredg- 
ing above specified, where it is not very rare. 
67. Amphora binodis,n. sp. ‘Pl. XIL, fig. 67. Form linear, with rounded 
apices, and two expansions half-way between the middle and the ends, between 
which it is deeply constricted. Length from 0:00175’ to 0-002"; greatest breadth 
about 0:0005"; breadth of narrow parts 0-0003’. Rectangular middle space nar- 
row. The detached halves or valves, having the ventral margin straight, and two 
large rounded expansions, while the ends are linear, much resemble the frus- 
tules of Hunotia Camelus, as described by Professor Smrru in vol. ii. of his Sy- 
nopsis, and figured by Dr Grevitte in the Annals of Natural History; but the 
expansions are smaller and more rounded than in #. Camelus. The inner lines 
