528 PROFESSOR GREGORY ON 
marked with small granules. Striation transverse, fine; number of strize not 
counted, but they are much finer than in A. pusilla. The detached segments are 
not yet known; but, as seen in fig. 98, the segments appear to be very narrow, and 
linear in form, the dorsal margin being hardly convex. The inner curve-lines and 
nodules are obscure. These characters, as well as the finer striations, the finer 
granulation of the bars in fig. 100 6, and the peculiar form of the middle space 
in fig. 100, sufficiently distinguish it from A. pusilla, the only form it resembles. 
This species occurs in the same Loch Fine dredging with those which imme- 
diately precede. 
The numerous examples here given of complex Amphorz, to which, as we 
have seen, two have been added from the simple group, prove that this group of 
forms is by no means a small one, since so many have been obtained in one lo- 
cality. It is worthy of remark, that the same dredging, which has yielded 
at least 12 or 13 of the forms just described, also contains A. costata, Sm., 
already alluded to as the first Complex Amphora ever figured in this country, 
though the peculiarities of its structure had not been fully appreciated. In fact, 
as we have seen A. Grevilliana, A. complexa and A. fascata to form a smaller group 
of closely allied species, so A. granulata, A. proboscidea, and A. cymbifera also 
form another such group, to which A. costata also belongs. It would almost seem 
as if the locality were favourable to these complex forms; for on the waters of the 
Clyde the whole of them occur. We have also in these waters four Amphiprore, 
with the remarkable additions of plates lying on the valves, namely, Apr. pusilla, 
Apr. lepidoptere, Apr. plicata, and Apr. maxima; and lastly we have the doubtfully 
named Apr. compleaa, which exhibits the same complex structure in its middle 
portion as we find in so many species of Amphora, that, namely, of segments 
packed together, and converging on the ends, like those of an orange or melon. 
But we must also remember that the same locality is equally rich in new forms 
of simple Amphore. 
GROUP VIL. 
MISCELLANEOUS. 
In this last group I shall describe a few forms of genera not yet named in this 
communication, and among them one or two whose real nature is doubtful. 
These are :— 
101. Navicula (?) Libellus, n. sp. | 106. Sceptroneis Caduceus, Ehr. 
102, Nitzschia (?) panduriformis, n. sp. 107. Synedra undulata, Greg. 
103. Nitzschia distans, n. sp., G. Toxarium undulatum, Bail. 
104. -- hyalina, n. sp, 108. Synedra Hennedyana, n. sp. (2) 
105. Pleurosigma (?) reversum, n. sp. 
and, as an Appendix, 
109. Creswellia Turris, n. sp., (Arnott). 
