510 PROFESSOR GREGORY ON 



63. Amphora turgida, n. sp. PL XII., 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 0008'' to 0-0015". Valve marked with 

 somewhat coarse radiate striae. Striae 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 Amphorae. The detached 

 valves or halves of this species, which are like small and very convex Cymbellce, 

 are much more frequent than the entire frustule. 



64. Amphora nana, n. sp. PI. XII. , fig. 64. Form a narrow, linear-elliptic. 

 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 00004" to 0-0005". Striae about 50 

 in 0-001". 



This small species occurs with the last, and is tolerably frequent. 



65. Amphora macilenta, n. sp. PI. XII., 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". 

 Striae parallel, rather coarse, about 30 in 0001". 



This species occurs with the two preceding, and is not at all unfrequent. 



66. Amphora angusta, n. sp. PI. XII., 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". 

 Striae 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. PI. XII., 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 Eunotia Camelus, as described by Professor Smith in vol. ii. of his Sy- 

 nopsis, and figured by Dr Greville in the Annals of Natural History ; but the 

 expansions are smaller and more rounded than in E. Camelus. The inner lines 



