NEW FORMS OF MARINE DIATOMACEiE . 521 



gated nodule in the middle. Bars between the lateral segments four or five. 

 Length 00011" ; breadth 0-00075". The whole form is transversely striated ; 

 stride distinct, about 36 in 0001". 



This pretty little form is not very rare in the Loch Fine dredging above men- 

 tioned, as containing most of the complex Amphorae. I have seen it also in 

 Lamlash Bay. 



83. Amphora Milesiana, n. sp. PL XIII. , fig. 83. 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 0001". The whole is transversely striated ; 

 striae about 28 in 0-001", conspicuous. 



This species occurs with the last, both in Loch Fine and in Lamlash Bay. 



84. Amphora elongata, n. sp. PL XIIL, 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. Striae 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 ; striae about 34 in 0-001". 



This species occurs both in Lamlash Bay and in Loch Fine, and is not very 

 rare. 



86. Amphora eoccisa, n. sp. PL XIIL, 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 0004" ; breadth 00015" 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 striae, which are best seen, 

 though with difficulty, at the outer margin. Striae 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 00045" ; breadth, 0-0013 to 0-0028". La- 



VOL. XXI. PART IV. 7 A 



