NEW FORMS OF MARINE DIATOMACES. 521 
gated nodule in the middle. Bars between the lateral segments four or five. 
Length 0-0011”; breadth 0:00075’. The whole form is transversely striated ; 
strize distinct, about 36 in 0-001’. 
This pretty little form is not very rare in the Loch Fine dredging above men- 
tioned, as containing most of the complex Amphorw. I have seen it also in 
Lamlash Bay. 
83. Amphora Milesiana, n. sp. Pl. XIIL., fig. 88. Form nearly rectangular, 
with a constriction in the middle, and subtruncate ends. The sides are very 
slightly convex. There are several longitudinal bars between the lateral seg- 
ments. Length 0:0023’; breadth 0-001’. The whole is transversely striated ; 
strie about 28 in 0-001’, conspicuous. 
This species occurs with the last, both in Loch Fine and in Lamlash Bay. 
84. Amphora elongata, u. sp. Pl. XIIIL., fig. 84. Form elliptic lanceolate ; 
long, narrow, with truncate extremities. Length 0-0044"; breadth 0-0011’ ; 
Lateral segments very narrow; curve lines very near the outer margin. There 
are six bars in the middle, convergent on the ends. Strize conspicuous, trans- 
verse, about 26 in 0:001’. 
This species occurs both in Lamlash Bay and in Loch Fine. It is not frequent, 
nor yet very scarce. 
85. Amphora quadrata,n.sp. Pl. XIIL., fig. 85. Form nearly rectangular ; 
the sides slightly convex, broad; ends truncated, as in A. truncata. Length 
about 0:0027"; breadth about 0:0018". Lateral segments arcuate on the dorsal, 
straight on the ventral margin. Between them are about six broad vertical stri- 
ated bars, which are not, as in the preceding forms, in apposition, but which are 
somewhat distant, being separated by narrow raphes. The structure, therefore, 
differs in some respects from that of the other complex species. The lateral seg- 
ments and the vertical bars are transversely striated; strise about 34 in 0-001’. 
This species occurs both in Lamlash Bay and in Loch Fine, and is not very 
rare. 
86. Amphora excisa,n. sp. Pl. XIII, fig. 86. Form rectangular. The curve 
line in each lateral segment keeps near the outer margin, except in the middle, 
where it bends inward to a nodule; but outside of this nodule is another, larger 
and more conspicuous, situated on the outer margin, which appears deeply 
notched at this point. Length 0-0025’ to 0-004’; breadth 0:0015" to 0-0018’. 
There are a number of longitudinal bars, convergent at the ends. The whole form 
is hyaline, and marked with very fine transverse striz, which are best seen, 
though with difficulty, at the outer margin. Strize about 52 in 0:001’. 
This fine species occurs in Lamlash Bay, where it is not unfrequent. It is also 
found more sparingly in Loch Fine. 
87. Amphora nobilis, n. sp. Pl. XIIL., fig. 87. Form barrel-shaped, broad, 
ends truncate. Length from 0°003’ to 0:0045’; breadth, 0:0013 to 0:0028". La- 
VOL. XXI. PART IV. TA 
