'92 



SYSTEMATIC HISTOEY OF THE INFUSOEIA. 



ERBA. 1844, 

 1-480". Stri« 



lar, like series of pearls, 

 p. 87. Fossil. Maryland. 

 11 in 1-1200". 



R. Rhombus (E.). — Small ; valves 

 broadly lanceolate, rnomboid, sometimes 

 suborbicular, scarcely longer than broad, 

 with short rostrate apices and line gra- 

 nulated strict. ERBA. 1844, p. 87 ; M. 

 pi. 33. 13. f. 19. Cuxhaven, Virginia. 

 1-1152" to 1-864". Striae 20 to 21 in 

 1-1200". 



R. scalar is (E.). 

 acutely lanceolate, 



— Valves 

 furnished 



slender, 

 with a 



double series of striae and window-like 

 crystalline spaces. ERBA. 1844, p. 271. 

 Fossil. Bermuda deposit. Diameter 

 3-960". Stride 9 in 1-1200". 



R. angusta (E.). — Valves elongate 

 lanceolate, with obtuse apices, 24 striae 

 in 1-1200", and no median smooth space. 

 ERBA. 1844, p. 364. India. 



R. lanceolata (E.). — Valves rhomboid- 

 lanceolate with obtuse apices, 21 striae 



ERBA. 1844, p. 

 13. India, China, 



364; 

 and 



smooth space. 

 M. pi. 34. 7. f. 

 Japan. 



R. Indica (E.). — Valves elliptic- 

 lanceolate with obtuse apices, 15 striae 

 in 1-1200", and a linear-lanceolate 



median space. ERBA. 

 India and Japan. 



1844, p. 365. 



R. fasciolata (E.). — Large ; valves 

 elliptic-lanceolate, twice as long as broad, 

 with strong, finely granulated striae in 

 transverse fasciae. ERBA. 1844, p. 204 \ 

 M. pi. 35 A. 22. f. 16. Antarctic Sea. 

 Ehrenberg's figure represents the valve as 

 elliptic, with transverse band-like series 

 of short longitudinal striae, alternating 

 with smooth spaces, and interrupted by 

 a smooth longitudinal median line. 

 (? Lower valve of a Cocconeis.) 



R. Scutellum (E.). — Valves elliptic, 

 longer than broad, with 12 or 13 stout, 

 crenidated striae in 1-1200". ERBA. 

 1844, p. 204; M. pi. 35 a. 1. f. 5. Ant- 

 arctic Sea. 1-864". (? Lower valve of 

 a Cocconeis.) 



'R.faseiata (E.). — Microg. pi. 35 a. 9. 

 f. 8. India. Valve elliptic, with broadly 

 rounded ends, a median line, transverse 

 fasciae of longitudinal lines alternating 

 with smooth transverse bands, and t^vo 

 series of marginal striae. (? Lower valve 

 of a Cocconeis.) 



Species (Eh.) known to us only by name. 



R. setacea, Sandwich Islands ; R. 

 Entomon, Asia Minor ; R. rhomboides, 

 Ganges ; R. Ganc/etica, Ganges ; R. 

 Icevis, India ; R. Africana, South Africa ; 

 R. Digitus, Demerara. 



Genus TRYBLIONELLA (S.). — " Frustules simple, free, elHptical or 

 linear ; valves plain ; alae submarginal or obsolete, canaliculi inconspicuous, 

 parallel." — Smith. Tryblionella is another genus separated from SurireUa 

 by Professor Smith, who says that it " differs from Campylodiscus in the more 

 elongated form of its frustules and the absence of the bend in its valves ; the 

 canaliculi are also more minute, and parallel rather than radiating. It agrees 

 with Surirella in the presence of alae ; but these arise from the disk." Mr. 

 Roper considers that TryblioneUa is distinguished from SurireUa by its fine 

 (often obsolete), parallel transverse striae ; whereas the latter is furnished with 

 canaliculi or costte, which are more or less divergent. 



T. 7iavicularis (Breb.). — Front view 

 oblong, with truncate, slightly winged 

 ends; lateral view eUiptic-acmninate ; 

 costae distinct, marginal ; alae con- 



Tryblionella circumsuta (B.). — 

 Lateral view elliptic-oblong, with a faint, 

 longitudinal median line (indistinct or 

 obsolete), parallel transverse striae, and 

 marginal gland-like dots ; alae very 

 short. = Surirella circumsuta, Bailey, MO. 

 pi. 2. f. 36 ; T. Scutellum, SBD. i. p. 35, 

 pi. 10. f. 74. Marine. America, Britain. 

 Professor Bailey describes it as having 

 a minutely granulate sm^face, and a 

 scarcely perceptible median constriction. 



T. gracilis ( S.). — Front view linear, with 

 attenuate extremities and truncate apices; 

 lateral view linear-acuminate ; costae 

 parallel, extending to median line ; alae 

 distinct. SBD. i. p. 35, pi. 10. f. 75. Fresh 

 and brackish waters. Lewes, (iv. 36.) 



spicuous. = Surirella navicularis, Breb, in 

 KSA. p. 36 ; T. marginata, SBD. i. 

 p. 35, pi. 10. f. 76. Fresh and brackish 

 waters. France ; England. 



T. acuminata (S.). — Lateral view 

 linear, with attenuated ends and delicate, 

 interrupted transverse striae ; alae obso- 

 lete ; canaliculi obscure. SBD. i. p. 36, 

 pi. 10. f. 77. Marine and brackish 

 waters. Britain. -0012" to -0021". 

 Stria? 31 in -001". (iv. 37.) 



T. angustata (S.).— Resembles^, acumi- 

 nata ; but its striae are continuous. SBD. 



