OF THE J3IDDULPJffIE.I 



849 



the central one is the largest, the others 

 decreasing regularly on each side, two of 

 them aimed. Mr. Roper unites this form, 

 probably correctly, with B. Tuomeyi. 



2 * Valves lanceolate or elliptical, ivithout 

 undulated margins (Odontella, Ag.\ 



B. aurita (Lyngb., Breb.). — Frustides 

 finely pimctated ; angles prolonged into 

 slender conical horns, with an interme- 

 diate projection, which is iLSually fur- 

 nished with a few spines ; valves elliptic- 

 lanceolate. SBD. ii. p. 49, pi. 45. f. 319. 

 = Odontella aurita, Ag., K. ; Denticella 

 aurita, E. ; Denticella gracilis, E. Ame- 

 rica, Africa, Europe. 



B. Roperiana (Grev.). — Valve elliptical 

 oval, with central elevation, which in 

 front view is depressed or sometimes 

 bilobed, punctate, unarmed j angular pro- 

 cesses scarcely produced, obtuse, largely 

 inflated at base ; connecting zone with 

 rows of minute granules, parallel with 

 suture of the valve. Grev JMS. vii. 

 p. 163, pi. 8. f. 11-13. Seaweed, Mon- 

 terey ; Californian guano. ^' This species 

 appears to be removed from B. aurita and 

 its varieties by the absence of spines, and 

 the very depressed, often two-lobed cen- 

 tral elevation of the valve " (Grev.). 



B. longicruris (Grev.). — Valve in front 

 view with central elevation, bearing a 

 very long spine ; angular processes very 

 much produced, awl-shaped ,• surface 

 minutely granulate. Grev JMS. vii. 



g. 163, pi. 8. f. 10. Californian guano ; 

 ieiTa Leone. 



B, turgida (E.). — Lateral portions in 

 front view scabrous, with produced, 

 conical, obtuse angles, and two distant, 

 long, intermediate spines; valves elliptic- 

 lanceolate. = Denticella turqida, EB. 

 1840, p. 207,; Odontella turgida, KB. 

 t. 18. f. 89 J Biddulphia qranulata, Ro 

 TMS.^ ^di. p. 13, pi. 1. f. 10,'ll.^ Atlantic. 

 Britain. Processes large, inflated at 

 base, slightly recui-ved ; spines generally 

 slightly bent at the middle j valves rough 

 with minute apiculi. 



B. reticulata (Ro.). — Valves hirsute, 

 with large hexagonal reticulations ; 

 processes obtuse, -subconic, inflated and 

 gibbous at the base. Ro TMS. vii. p. 14, 

 pi. 2. f. 14-17. Ceylon, Natal, New 

 Zealand. Valves elliptic; connecting 

 zone having rows of rather conspicuous 

 dots. 



B. Indica (E., Ro.). — Valves hirsute, 

 with slender, elongated, subcapitate pro- 

 cesses, and a long awl-shaped spine 

 near each process. Ro TMS. vii. p. 16, 



pi. 2. f. 20-22. = Denticella Indica, ERBA. 

 1845, p. 302. _ Natal, (vi. 12.) Valves 

 lanceolate, with the pseudo-apertures at 

 right angles to the length of the valve, 

 Roper. 



B. tumida (E., Ro.). — Valves broadly 

 elliptic, with very fine radiating dots, 

 and two or three submargiual spines ; 

 in front view globose, ^vith tapering 

 obtuse processes. Ro TMS. vii. p. 15, 

 pi. 2. f. 18, 19. = Denticella tumida, 

 ERBA. 1844, p. "im ; Odontella tumida, 

 KSA. p. 137. Bermuda ; Californian 

 guano. 



B. Macdonaldii (Norman, MS.). — 

 Fnistules finely striated, with very short, 

 nearly obsolete processes; valves with 

 transverse strife interrupted by a median 

 line. Shark's Bay, Australia, (vni. 23.) 

 Valves minutely dotted between the 

 striae ; frustules somewhat twisted. For 

 the description of this species we are 

 indebted to G. Norman, Esq. 



Doubtful or imperfectly known Species. 



B. ? hrevis (E.). — Small, laterally lan- 

 ceolato-rhomboid, smooth, tripartite 

 with two septa; lateral portions also 

 three-lobed ; lobes small, subequal -, 

 pseudo-openings obsolete. KA. p. 138. 

 Portugal. 



B. ? gigas (E.). — Large, very turgid 

 at the centre, rough, without distinct 

 granules, laterally five-jointed, having a 

 large, oblong (pseudo-) opening at each 

 attenuated apex. KSA. p. 138. Fossil. 

 Bermuda. l)iam. 1-144". 



B. ? lunata (E,). — Valve three-lobed, 

 smooth, slightly cm^ved, limate, with 

 subacute horns. EM. pi. 18. f. 53. Fossil. 

 Virginia. Uiam. 1-864". 



B. ? ursina (E.). — Large, turgid, not 

 cellidose ; sides hirsute, not constricted, 

 middle part smooth. KSA. p. 138, 

 fragment. Antarctic regions. Diam. 

 1-192". Remarkable for its hairiness. 



B. ? ampliicephala (E.). — Smooth, nar- 

 row, wand-like, concatenate, constricted 

 beneath each apex ; hence each end capi- 

 tate, rounded. = Odontella? amphicephala, 

 E. KSA. p. 137. Mouth of the Tagus. 

 Individual frustules resemble those of 

 Navicula dicepliala in habit. 



B. ? Fragilaria = Denticella ? EM. 

 pi. 21. f. 31. Algiers. Perhaps a frag- 

 ment of Eucyrtidium lineatuni. 



B. ? Cirr]ius{E.). — In Barbadoes earth. 

 We have seen neither description nor 

 figure of this species. 



3i 



