882 



SYSTEMATIC HISTOEY OF THE INFUSOEIA. 



transverse striae, Donkin in TMS. vi. 

 p. 30; pi. 3. f. 15. Marine. Northumber- 

 land, (vii. 52.) 



3 * Frustules icith produced or rostrate 

 ends and rowidish nodules. 



A. aponina (K.). — Frustules lanceo- 

 late-elliptic, with produced, truncate 

 apices, and no longitudinal lines. KB. 

 p. 108, pi. 5. f. 33. Italy. Minute. 

 1-1080" to 1-650". 



A. coffeceformis (Ag., K.). — Frustules 

 lanceolate, with produced, obtuse apices, 

 strong- marginal longitudinal lines, and 

 faint or obsolete median ones. KB. 

 p. 108, t. 5. f. 37. = Frustulia coffece- 

 f or mis, Ag. ; Naricula quadricostata, E 

 Inf. t. 21. f 9. /3. Fischeri, with fewer 

 marginal and obsolete median longi- 

 tudinal lines. Carlsbad. 1-1720" to 

 1-480". 



A. acutiuscula(K.). — Frustules turgid- 

 lanceolate, with acuminated, subacute 

 apices, and strong marginal longitudinal 

 lines. KB. p. 108, t. 5. f 32. Marine. 

 Genoa. Small. 1-576". 



A. lineata (Greg.). — Frustules eUip tic- 

 lanceolate, with prolonged conic ends 

 and conspicuous longitudinal lines ; 

 transverse striae fine, obscm^e, about 42 

 in -001". GDC. p. 40, pi. 4. f. 70. Scot- 

 land. Outer portions of valves narrow 

 limate, with convex dorsmn and straight 

 venter. 



A. Ergadensis (Greg.). — Frustules 

 elongated lanceolate, with broad, slightly 

 produced, truncate ends; transverse striae 

 conspicuous, about 24 in -001". GDC. 

 p. 40, pi. 4. f. 71. Scotland. Remarkable 

 tor its length. Outer portions of valves 

 slender, with nearly straight venter. 



A. exigua (Greg.). — Frustules elliptic- 

 lanceolate, with slightly produced, ob- 

 tuse ends ; transverse striae about 28 in 

 •001". GDC. p. 42, pi. 4. f J5. Scotland. 

 Small ; in size and form it approaches 

 nearest to A. lineata, but its markings 

 are totally different, Greg. 



A. Semen, EM. pi. 38. 17. f ^ 10. Ice- 

 land. In the figm-e, this species is ven- 

 tricose, with broad, shortly produced, 

 truncate ends, and without striae. 



A, salina (S.). — Frustules elliptic-ob- 

 long, with slightly produced, trimcate 

 extremities; valves limate, rostrate, 

 with 64 striae in -001". SBD. i. p. 19, 

 pi. 30. f. 251. Brackish water. Sussex. 

 Scarcely silicious. -0008" to -0016", S. 



A. turgida (Greg.). — Frustules broadly 

 elliptic or suborbicular, with short ros- 

 trate apices ; outer portions semilunate, 

 with capitate apices, and 24 rather 



coarse radiant striae in '001". GDC. 

 p. 38, pi. 4. f 63. Scotland. Small. 



A. monilifera (Greg.). — Frustides 

 elliptic-oblong, with short, broad, ros- 

 trate ends ; outer portions arcuate, with 

 capitate, recm'\'ed apices; dorsum with 

 converging longitudinal rows of distant 

 dots. GDC. p, 39, pi. 4. f 69. Scotland. 



A. cymhifera (Greg.). — Frustules in- 

 flated, with short, subcapitate, rostrate 

 apices ; outer portions arcuate, with 

 capitate, recm-ved ends, and 22 rather 

 coarse transverse striae in '001" ; con- 

 necting zone with converging longi- 

 tudinal bars. GDC. p. 54, pi. 6. f 97. 

 Scotland. (^t:i. 54.) Large ; dorsum 

 fm-nished with longitudinal series of 

 transverse striae, separated by longi- 

 tudinal lines or bars. 



A.proboscidea (G.). — ^Frustules linear- 

 oblong, with produced, truncate extre- 

 mities ; valves arcuate, ^vith rostrate, 

 capitate ends, and 20 coarse transverse 

 striae in -001" ; dorsimi with longitudinal 

 series of transverse striae. GDC. p. 54, 

 pi. 6. f. 98. Scotland. Large. The 

 capitate beaks of the valves are longer 

 than in A. cymhifera, and are not re- 

 cm'ved, but bent foi'wards. 



A. costata (S.). — Frustides ventricose, 

 with short, broad, truncate beaks, longi- 

 tudinally costate ; costae with a double 

 line of moniliform pimcta. SBD. i. 

 p. 20, pi. 30. f 253. Marine. Britain. 

 Valves semilunate, with capitate ends; 

 transverse striae coarse, about 16 in 

 •001", Greg. 



A. Terroris (E.). — Valves elongated, 

 straight, semilunate, suddenly attenuated 

 into stiliform beaks ; transverse striae 

 strongly granulated, 19 in 1-1200". 

 ERBA. 1853, p. 526 ; EM. pi. 35 a. 23. 

 £ 2. Akin to A. fasciata, but smaller 

 and more strongly granulate, E. 



A. macilenta (Greg.). — Frustules nar- 

 row elliptic-lanceolate, with short, 

 broad, slightly produced apices ; outer 

 portion of valves with straight ventral 

 margin, and about 30, rather coarse 

 paraUel stri^ in -001". GDC. p. 38, 

 pi. 4. £ 65. Scotland. 



A. gramdata (Greg.). — Frustules 

 linear-oblong or elliptic-oblong, with 

 short, broad, truncate, slightly produced 

 apices; outer portion of valve with 

 straight ventral margin, rostrate apices, 

 and from 24 to 30 transverse sti-iae in 

 •001" ; dorsum having longitudinal lines 

 alternating with series of granules. 

 GDC. p. 53, pi. 6. £ 96. Scotland. 



A. vetitricosa (Greg.). — Frustules lan- 

 ceolate, with turgid middle and tapering 



