OF TRE GOMPHOKEMEJ::. 



889^ 



but shorter and stouter. To G. cristatum 

 probably belongs the Mexican form de- 

 scribed by Ehrenberg as a variety of 

 G. Auc/iir, having the apex constricted 

 into a small terminal mucro, 



G. Aiujur (E.). — Front view linear- 

 cuneate, lateral view rhomboid, with 

 subacute apex and acuminated base. 

 EM. several figures. Europe, Asia, 

 Australia, Africa, America. 1-960". 

 "More slender and with sharper point 

 than G. cristatum,''^ Rab. Professor 

 Kiitzing unites G. cristatum to this spe- 

 cies; and certainly they, as well as G. 

 Lagemda, seem closely allied. Ehren- 

 berg's figm'es vary considerably in form, 

 but all have the apex more cuneate than 

 we have ever seen it in G. cristatum. 



G. Lagemda (K.). — Slender, linear- 

 cuneate, finely striated; lateral view 

 clavate, crowned with a minute point, 

 tapering and subacute at base. KB. 

 p. 85, pi. 30. f. 60. = G, sphm'ophorum, EM. 

 pi. 35 A. 7. f. 14. America, Europe. 

 Stipes short. 1-720". This form ap- 

 parently difiers from G. cristatum only 

 in its narrower frustule. 



G. apiculatum (E.). — Cuneate ; lateral 

 view obovate, with acute cuneate apex 

 and tapering base. EM. pi. 4. 2. f. 39. 

 Fossil. America, (xn. 28 & 53.) ^3 

 more slender than G. apiculatum : EM. 

 pi. 2. 2. f. 43. 



G. Turris (E.). — Much elongated, 

 clavate, its apex suddenly acutely cu- 

 neate. EM. several figm'es. Africa, 

 America, India, Japan. Ehrenberg's 

 figures vary in form, but are mostly 

 clavate, with or without a slight con- 

 striction above the middle. "Akin to 

 G. gracile, but stouter," E. 



2 1 Apex in lateral view neither acute 

 nor apiculate. 



G. ahhreviatum (Ag.). — Frustules 

 broadly cuneate, conjoined in a flabel- 

 late manner ; lateral view obovate, with 

 indistinct strise and romided apex. KB. 

 p. 84, pi. 8. f. 5-7. = Echinella ahhreviata, 

 Ehr. /3. longipes (K,), stipes elongated; 

 subbranched, = G. rotundatttm, E. Eu- 

 rope, Asia, Australia, America. 1-1152" 

 to 1-840". Stipes rather thick, usually 

 very short and simple, but in var. ^ 

 more elongated. 



G. spheneUoides (Rab.). — Obovate, 

 smooth, with broadly roimded apex; 

 stipes simple, stout. Rab D. p. 58, pi. 8. 

 f. 1. Italy. Front \"iew cimeate. Pro- 

 bably only a fonn of G. ahhreviatum. 



G. micropus (K.). — Front view linear- 

 at each end ; lateral 



view obovate-lanceolate. KB. p. 84, 

 pi. 8. f. 12. Germany, France. Very 

 finely striated?; stipes very short and 

 obsolete, or elongated filiform and sub- 

 ramose. " Resembles G. spheneUoides, 

 but is smaller and more slender," R. I. c. 



G. tenellum (K.). — Minute, smooth; 

 lateral view obovate-lanceolate; stipes 

 abbreviated, simple. KB. p. 84, pi. &. 

 f. 8. Em-ope. 1-1440". 



G. Persicum (Rab.). — Lateral view 

 obovate, \sdth rounded upper end, stri- 

 ated ; front view broadly cuneate. Rab D. 

 p. 59, pi. 8. f. 4. Persia. The figm-e re- 

 presents the front view with conspi- 

 cuous terminal puncta and longitudinal 

 ^dttae or sutm^e-like lines. 



G. Hercynicum (Rab.). — Lateral view 

 obovate-lanceolate, with obtuse ends, 

 the upper one cuneate; striae distinct; 

 front view broadly cimeate. Rab D. 

 p. 59, pi. 8. f. 28. 



G. suhramosum (Ag.). — Lateral \'iew 

 clavate ; front view cuneate, with acute 

 base ; stipes long, slender, nearly simple. 

 KB. p. 85; pi. 8. f. 15. = G. septatum, Ag 

 CD. ; G. oculatum, KSA. ; G. discolor and 

 G. clavatum, E. (according to Kiitzing). 

 Common. Europe, Asia, Africa, Ame- 

 rica. 1-1140" to 1-600". Strite very 

 faint. We quote G. clamtum (E.) imder 

 this species in deference to Kiitzing's 

 authority, because the description will 

 not determine the question ; and although 

 Ehrenberg, in his 'Microgeologie,' figures 

 it from more than twenty stations, yet 

 those fio-m*es differ so greatly as to afford 

 no decisive information : several of them 

 are lanceolate or clavate, whilst, like G. 

 Glans (a species indeed described as 

 having a general resemblance to G. clava- 

 tmii), the greater number have an inflated 

 centre. 



G. erosum (Rab.). — Oblong-obovate, 

 with emarginate apex ; front view 

 narrow-cimeate ; stipes dichotomously 

 divided. Rab D. p. 59, pi. 10. f. 12. 

 Dresden. 



5 * Frustules in latercd view ventricose at 

 the middle, attenuated at each end. 



G. Glans (E.). — Ovate-oblong, tumid; 

 upper end rounded, with a slightly tu- 

 mid neck. EM. pi. 4. 2. f. 35.' Has a 

 general resemblance to G. clavatum, but 

 is shorter, stouter, and more obtuse. 

 Ehrenberg's figm*es represent it with 

 ventricose centre, broadly conical above, 

 with roimded apex, and tapeiing below 

 into a short, slenderer base. 



G. Oregonicum, EM. pi. 37. 2. f. 12, 13. 

 Fossil. Oregon. Ehrenberg's figure of 



