KONGL, SV. VET. AKADEMIENS HANDLINGAK. 15AM) 25. N:0 5. 109 



rectangulatim positis; apice bi-inciso truiicatae; membrana glabra; sinu brevi, aperto, 

 rotundato. A vertice visum triangulare; apicilus acutis, lateribus leuiter concavis. 



Long. 60—65, lat. 70 (c. acul.), lat. isth. 16, 1. acul. 11—13 fi. (Also in Wal- 

 lich Mscr. No. 238). T. XIV, f. 21, X 300. 



Wallich states that the endochrome is radial, in vertical view bitid towards 

 tlie angles. 



24. S. ensiferum, n. sp. S. medioere, cjuinta parte latius quam longiun; seniicellulis cu- 

 neatis, ventre inflatis, dorso leuiter eonvexis, angulis 3 brevibus productis bi-aculeatis; 

 aculeis rectis vel paullo curvatis, rectangulatim positis; membrana glabra; sinu brevi, 

 rotundato, vix distincto. A vertice visum triangulare; lateribus fere planis vel paullo 

 eoneavis, apieibus acutis. 



Long. 54, lat. 62 (c. acul.), lat. isth. 11, long. acul. 10—12 /n. Also in Wal- 

 lich Mscr. No. 2-10, f. 3). T. XIV, f. 22. 



In vert. view scarcely distinguishable in outline form tlie preceding, but in front 

 view the sides of the semicells, and the apices differ considerably. 



Kaneegunge, Nov. 1855, G. C. W. Common. 



25. S. quadratum, n. sp. S. minus, latius quam longum, sub-(|uadratum; seniicellulis late 

 cuneatis, latere inflatis, apice truncato-retusis, externe in angulos 4 productis, angulis 

 bitidis, cornutis, cornubus paullo curvatis, horizontalibus ; membrana glabra; sinu acuto- 

 triangulari, interne rotundato. A vertice visum quadrangulare; angulis bitidis, incisuris 

 angulorum inteiTie rotundatis. 



Long. 20 — 25, lat. 25 — 36 (c. corn.), lat. isth. 15, long. corn. 6.5- 8 <". T. 

 XIV, f. 1 ( J, X 300 (after Wallich Mscr. No, 226). 



Nearest to S. bifidum (No. 21 supra), from whioh it diffcrs in the general out- 

 line of the semicells being more tumid laterally, it is also smaller than that species. 

 Wallich does not notice a triangulär form. 



26. S. strioliitum (Näg.) Archeb (in P. Inf. p. 740; Phycaatrum (Aiubli/<ictittinni) striola- 

 ((iiii Näg. Kin/.. Alg. j). 126, t. VIII A, f. 3, 1K41); forma IJrasiliensis (St. striolatum 

 N0BD6T. Desm. Brås. 225, t. I\', f. 45). 



<i. Lat. & long. 28—21; lat. isth. 6 (i. Long. -lat. T. XIII, f. 15. 



I). Long. 1!) — 22, lat. 15 — 18, lat. isth. 6 /n. Longior quam latum. G. C. W. 



In the Indian forms (also iu Wallk n Mscr. Nos. 1S7, 224) the apices are Hat, 

 as represented by NoRDSTEDT 1. c, and the fronds often cohere and form short fila- 

 meiits — hence Wallkii formed the opinion that this was a cönnecting-link between 

 SldKitistriiin and Sphcerozosma .' Neither Dr W . nor I have scen the triangulär form. 



27. S. dilatatnm Eiikh. (Infus. p. 143, t. X, f. 13, 1S38; Ralf», L>r. Desm. p. 13:'», t. XXI, 

 f. 8; Menegh. Synops. p. 227; Phycastrum dilatatum Kltz. Phyc. Gerin. ]). 138; Go- 

 niocystis (Stawastrunt) dilatata, Hass. Br. Fr. Alg. p. 353, t. 85, f. 5). Var; Indicnm, 

 11. v. Isthmo elongato, sinu ampliato, angulis non abnipte truncatis, apieibus leuiter 

 eonvexis, Wallich Mscr. No. 278. 



Long. H).5— 23, lat, 16.5—20, lat. isth. 7 — 8 t u. T. XIII, f. 17. 

 Only tlie 4-angled form observed by G. C. W.; the one figured by me is 3- 

 angled. This is so much like the preceding that I wonder not at Nokdstedt (Desm. 





