OF THE GOMPHONEME^. 



891 



G. affine (K.)* — Ratlier turgid, elon- 

 gate, striated ; margins in front view 

 slightly curved; lateral view sublan- 

 ceolate, with, an obtuse apex. KB. p. 86, 

 pi. 30. f. 54. Trinidad. 1-3G0". Stipes 

 abbreviated, subramose. " It diifers from 

 G. dichotomum in its tinner habit and 

 broader sides; lateral apices more ob- 

 tuse " (K.). According to Rabenhorst, it 

 is slenderer than G. lanceolatum, but 

 scarcely specifically distinct. 



G. Fibula (Breb.). — Slender, elon- 

 gated, veiy narrow-cuneate ; lateral 

 view acicular, very slender; stipes short, 

 nodule obsolete. KSA. p. 65. France, 

 England. Akin to G. dichotomum, but 

 dift'ers in its slenderer frustules. 



G. exigimm (K.). — Minute, smooth, 

 lateral view lanceolate; stipes slender, 

 subramose. KB. p. 84, pi. 30. f. 58. Ma- 

 rine. France, Jutland. 1-1440". 



G. cusjndatum (Rab.). — Cuneate, often 

 curved ; lateral view smooth, lanceolate, 

 with acute ends. Rab D. p. 59, pi. 8. 

 f. 22. Saxony. With or without a 

 stipes. 



G. cequcde (Greg.). — Lateral view lan- 

 ceolate, wdth minutely capitate apices, 

 an exactl}^ central nodide, and conspi- 

 cuous striae. Greg. MJ. iv. p. 12, pi. 1. 

 f. 41. Scotland. -001". Striee 22 to 24 in 

 •001". It agrees nearly with some forms 

 of G. tenelliim, from which, however, it 

 differs in having much wider and coarser 

 striae, and in the central position of the 

 nodule, Greg. /. c. A slight constriction 

 exists beneath each end. Professor Smith 

 refers it to G. tenellum. 



G. insigne (Greg.). — Lateral view lan- 

 ceolate, slightly rhomboid, with obtuse 

 ends ; striae 18 to 20 in -001". Greg. MJ. 

 iv. p. 12, pi. 1. f. 39. Scotland. -0016" 

 to -0025". " Distinguished by its size and 

 the coarseness of its striation. Side view 

 doubly conical, the angles at the broadest 

 part being strongly marked." Professor 

 Smith thinks it may be a form of G. 

 Sarcophagus. 



G. Sarcophagus (Greg.). — Lateral view 

 clavate, lanceolate, constricted near the 

 extremities, which are minutelv capitate. 

 Greg. MJ. iv. p. 13, pL 1. f. 42. " Scotland. 

 •0014". Strife 20 to 22 in -001". Widest 

 part about one-third from apex. Pro- 

 fessor Gregory compares the outline to 

 that of a coffin. 



G. mimdissimum (K.). — Linear-cune- 

 ate, smooth, with a slender subbranched 

 stipes; lateral view narrow-lanceolate. 

 KB. p. 84, pi. 8. f. 11. Marine. Britain, 

 (xi . 17.) Kiitzing regards this as the 

 6r. mimdissimum of Gre\411e ; but that 



opinion is doubtless eiToneous ; for this 

 is a marine, and Greville's was an aquatic 

 gathering in which G. olivacemn and G. 

 curvatum were mixed together. 



G. auritum (Braun.). — Broadly cune- 

 ate in front view, the upper end trimcate, 

 with an awm at each angle ; lateral view 

 lanceolate, with a terminal awTi. Rab D. 

 p. 59, pi. 8. f. 3. Baden. Habit of G. 

 ijitricatum, but fiu'nished with awnlike 

 spines, 



G. KavicuJoides (S.). — Stipes distinct 

 and regularly dichotomous ; front view 

 sublinear, truncate ; lateral view acutely 

 lanceolate, with the extremities equal 

 and nodule central. SBD. ii. p. 98. In 

 the Victoria Regia tank, Edinbm-gh. 

 According to Professor Smith, this spe- 

 cies, in a lateral view, is not to be di- 

 stinguished from a Navicula, as the 

 nodule is almost exactly central. 



Species insufficiently described, or known 

 to us only by 7iame. 



G. digitatum (K.). — Frustules very 

 minute and smooth, linear-cuneate, fla- 

 bellate; stipes simple, dilated above. 

 KB. p. 84, pi. 21. f. 2. 2. Marine. Cux- 

 haven. 1-680". Kiitzing gives no de- 

 scription or figure of the lateral view. 



G. telographicum K.). — Frustules mi- 

 nute and very smooth, slender, cimeate, 

 somewhat more acute at base, umbel- 

 lately aggregated on a simple abbrevi- 

 ated stipes dilated at its apex. KB. p. 84, 

 pl.8.f.9. Maritime. Heligoland. 1-1200". 



G. crassum (Rab.). — Front view 

 broadly cuneate, trimcate above, rounded 

 at base ; the lateral margins convex, 

 faintly striated. Rab D. p. 59, pi. 10. f. 13. 

 Persia. Although only the front view 

 is described and tigiu-ed, yet the species 

 seems well distinguished by the convex 

 (not straight) lateral margins, giving 

 it an obovate fomi with the broader 

 end truncate. The puncta are conspi- 

 cuous in the figure, as are also two lon- 

 gitudinal lines or vittae. 



G. pulvinatum (Braun). — Front view 

 broad, linear-cimeate ; base smaller than 

 the very thick, serpentine, irregularly 

 divided "stipes. Rab D. p. 58, pi. 8. f. 16. 

 Zurich. " Forms little, very thick, smooth 

 knoblike cushions of equal height." 



G. ? contractum (K). — Very minute, 

 attenuated at the base, slightly con- 

 stricted at the middle, with a dilated 

 roimded apex ; stipes simple, abbreviated 

 or obsolete. KB. p. 86, pi. 14. f. 21. 3. 

 Germany. 1-1440". Kiitzing's figiu-e, 

 which is very minute and pyrifomi, 

 shows no median line, nodule, or striae. 



