KONGL. NV. VET. AKADEMIENS HANDLINGAR. BAND. 25. N:0 5. 29 



Ehrenbeeg's description, bis figure, and his notes on Bailey's work, are all very doubt- 

 ful — in fact invalid! Baileys figure gives long. circ. 555, lat. bas. 57, It. apie. 41 «> 

 and seeius to be a fair representation of the form of BrÉbisson. Of Ehrb.'s figures, 

 the nearest to this seems to be that of Cl. trabecula (Infus. ex. p. t. VI, f. II, No. 3) 

 but the ieon is very poorly drawn. 



9. I). polyinorphum, n. sp. Doc. tenue, circ. 17 — 19-plo longius quam latuni, rectum, 

 margine fe re planum, regulariter attenuatum; menibrana laevi; sutura (sed etiain non) 

 prosiliente; apicibus truneatis, paullo rotundatis, dentibus 4 munitis. Tu nior basalis 

 plus minus prominens. 



Mensurae: Long. 308, lat. bas. 16, lat. apic. 10 ,«. 

 » 300, » » 16, » »10 » 



270, » » 18, » » 9.5 » T. II, f. 13, 17; IV, f. 13. 

 Plentiful in Dr. Wallichs collection. 



10. D. crenulatum (Eiir.) Wolle (Desm. U. S. Amer., ]>. 47, t. IX, f. 1; Roy and Bisset 

 Jap. Desm. t. 268, f. 19; D. nodulosum Bréb. ex. p. auct. nonnull.; Pleur. crenulatum 

 Rabii. Fl. Eur. Alg. III, p. 142, 1868; Closterium crenulatum! Eiirb. Verbr. Amer. 

 pp. 81, 123, t. IV, f. 29, 1843). Cfr note under synon. of No. 8. 



Long. 460 — 510, lat. max. 46 — 57 ,'/. 

 Northern India. 



11. D. rhomphieum, n. sp. D. elongatum, tenue, 30 — 35-plo longius quam latum, vix at- 

 tenuatum, fere rectum; apicem rotundato-truncatarn, dentes 4 — 6 preditam, habens. 

 Membrana glabra; sutura prosiliens. Tumöres duo supra partem basalem. 



Long. 320—380; lat. bas. 13, lat. semic. 9, lat. apic. 8 /u. T. II, f. 18. 

 Fairly common in Bengal. Somewhat resembling D. baculoidés Roy and Bisset 

 (Jap. Desm. f. 18), but differs in the projecting suture, and the teeth at apex. 



12. D. longinscnlum, n. sp. D. elongatum, tenuissimum, 40 — 46-plo longius quam latum, 

 paullulum attenuatum; fröns indistincte undulata, margine regulari; apicibus rotundatis; 

 membrana glabra; sutura non prosiliente; basi paullo inflato. 



Long. 490—550, lat. bas. 14—16, lat. centr. 12, lat. apic. 8—9 /u. T. II, f. 19. 

 Not uncommon. 



13. D. subcoronulatum, n. sp. D. mediocre, fila formans. Semicellula! diametro regulari, 

 margine paullulum undulato, basi valde inflato, sutura paullum prosiliente; apicibus 

 truneatis adhau-entibus in fila eonjuncta?; apicibus gemuiis vel tuberculis (una-maculatis) 

 20 — 26 ornatis. Membrana glabra, vel subtiliter punctata. 



Long. 340—400, lat. bas. 28—32, lat. apic. 24—28 ,«. T. III, f. 1. 

 The endochrome of this species is in fillets, of which 3 or 4 are visible. At 

 the apices a marking (fissure or plication?) proceeds from the base of each tubercle. 



14. I), alternans, Nordst. (Desm. Brås. p. 205, t. III, f. 36, 1869) f. minor. Ut in f. ty- 

 pica sed minor. D. mediocre, fila formans! circ. 9 — 10-plo longius quam latins; sutura 

 prosiliente; semicellulas in niedio attenuatss, leviter 7-undatae, undis alternatim majori- 

 bus; apicibus truneatis coronula tuberculorum minorum ovatorum circ. 14 (a fronte 

 visorum); membrana punctata? 



Long. 416 — 470, lat. max. 46, lat. min. (centr.) 39 ,u, fide Wallich. 



