KONGL, SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 115 



elongated and oblique. Transverse striae radiate in the middle and 14 to 16 in 0,oi mm., but 18 

 in 0,01 mm. at the finds. Longitud. striae 18 in 0,oi mm. — Pleur. Bail. Grun. A. D. p. 59. 

 Per. VIII f. 11. 



Brackish water: Bengal (Grunow). 



4. G. Strigilis W. Sm. (1852). — V. narrow, lanceolate, sigmoid, gradually tapering to the 

 subacute ends. L. 0,25 to 0,36; B. 0,03 to 0,034 mm. Median line central, slightly flexuose. Trans- 

 verse striae more distant than the longitudinal. T.S. : L.S. 'Visi "As' 'Vie "^ 0,oi mm. — Pleur. 

 Strig. W. Sm. Ann. Mag. N. H. (2) IX p. 8 PL II f. 4. B. D. I p. 66 PL XXII f. 208. 

 Per. VIII f. 4. 5. 



Brackish water: Baltic! North Sea! English Channel (W. Sm.), Batavia! 



Var. Smithii Grun. (1880). — L. 0,i5 to O.025; B. 0,012 to 0,oi8 mm. T.S. : L.S. 'Vjg, 

 '*/ig in 0,01 mm. — Pleur. Smithii Grun. A. D. p. 58. 



Brackish water: Java! Bengal (Grun.), South America (Grun.). 



Var.? tropica Grun. (1860). — Ends obtuse. L. 0,i6 to 0,3; B. 0,o23 to 0,033 mm. Transv. 

 striae about 21 in 0,oi mm. — Pleur. tropicum Grun. Verb. 1860 p. 559 PL III f. 34. Per. VIII f. 7. 



Marine: Red Sea (Grun.), "West Indies (Grun.). 



Var.? capensis Petit (1891). — L. 0,3; B. 0,oi7 mm. T.S. : L. S "/isi in 0,oi mm. — 

 Pleur. cap. Per. p. 21 PL VIII f. 6. 



Marine: Cape Good Hope (Petit). 



5. G. Kiitzingii Grun. (1860). — V. gently sigmoid, lanceolate, with acute ends. L. 0,o8 

 to 0,12; B. 0,012 to 0,015 mm. Central nodule somewhat elongated. Median line central, sigmoid. 

 Transv. striae slightly radiate in the middle, more distant than the longitudinal. T.S. : L.S. ^'/j,, 

 ^%4. ^*/26. ^%e in 0,01 mm. — Pleur. Kutsingii Grun. Verb. 1860 p. 561 PL VI f. 3. P. Spencerii 

 var. Kiltz. Grun. A. D. p. 59. V. H. Syn. p. 118 PL XXI f. 14. Per. VIII f. 22. P. gracilentum 

 Rabh. Alg. Europ. N:o 1066 (1861). P. Wormleyi Sulliv. = P. Spencerii var. acutiuscula Grun. in 

 V. H. Types N:o 183. 



Fresh water: Sweden (Lake Malaren)! Finland! Belgium (V. H.), Saxony! East Indies (Grun.)! 

 Japan! Tasmania! New Zealand (Grun.), Waltham in Massachusetts! Hudson River! Argentina! 



6. G. Febigerii Grun. (1879). — V. lanceolate, gently sigmoid, subacute. L. 0,ii to 0,15; 

 B. 0,0145 to 0,015 mm. Central nodule rounded. Median line sigmoid, central. T.S. : L.S. ^7,9 in 

 0,01 mm. — Pleur. Febig. Grun. CI. M. D. N:o 223. A. D. p. 60. P. Spencerii var.? Febig. 

 Per. VIII f. 28. 



Marine: California (Grun.). 



7. G. diaphanum Cl. N. Sp. — V. lanceolate, sigmoid, subobtuse. L. 0,o85; B. 0,oi5 mm. 

 Median line central, sigmoid. Centralnodulerounded. T.S. : L.S. "/j,„ in 0,oi mm. — PL VI (Part II 

 PL I) f. 6. 



Marine: Isle de Brehat, France! Gullmarefjord, Sweden! 



8. G. (Rhoicosigma) glaciale Cl. (1883). — V. thin, lanceolate, gently sigmoid, gradually 

 tapering to the acute ends. L. 0,143; B. 0,oi9 mm. Median line very slightly sigmoid. Transv. 

 and longit. striae equidistant, 28 in 0,oi mm. — Pleur. glaciale Cl. Vega p. 476 PL XXXV f. 13. 

 Pee. VII f. 15. 



Marine: Cape Wankarema! 



9. G. attenuatum Kutz. (1833)! — V. gently sigmoid, lanceolate, gradually tapering from 

 the middle to the obtuse ends. L. 0,i8 to 0,24; B. 0,025 mm. Median line gently sigmoid, central. 

 Longitudinal striae stronger and more distant than the transverse. T.S. : L.S. "/loi 'V12. 'Vu in 

 0,01 mm. — Frustulia attemiata Kutz. Dec. N:o 83 (accord, to Lagst.). Pleur. atten. W. Sm. B. D. 

 I p. 68 PL XXII f. 216. V. H. Syn. p. 117 PL XXI f. 11. Per. VII f. 9. P. Hippocampus W. Sm. 



