KONGL. SV. VET. AKADEMIENS HANDLINGAH. BAND 25. NIO 5. 131 



Long. 42—52, lat. 24—28, lat. istb. 14, long. acul. 2—2.5 /u. T. XV, f. 18 

 (also in Wallich Mscr. No. 265, f. 1 ). 



Forma major. Majas, elongatum, paullulum eonstrictum sinn nullo; aculeis paullo 

 convergentibus. 



Long. c. acul. 72 — 76, lat. 33 — 35, lat. isth. 20 — 22, long. acul. 5 — 6 /u. T. 

 XV, f. 19. 



Cfr No. 117. 



116. S. eximium, n. sp. S. mediocre, quinta parte latius quam longuin; semicellulis sub- 

 fusifonnibus, dorso leniter convexis, ventre e basi regulariter infiatis; angulis 3 paullo 

 contractis externe rotundate capitatis; capitulis 4 — 5 mucronatis, mucronibus oppositis; 

 scinicellulaj sub angulis prominentiis plus minus brevibus trifidis instrueta:; et apud 

 suturam prominentiis minoribus etiani trifidis ornatse; membrana reliqua glabra; sinu 

 valde aperto rotundato. A vertiee visum triangulare, centrali parte convexum; an- 

 gulis capitatis et apices versus eonstrictum. 



Long. 42, lat. 52, lat. isth. 11.5, long. muer. 1.5 ,//. T. XVII, f, 6 (after Wal- 

 lich Mscr. No. 23!)). 



This species is decidedly unique, but nearest to S. nodiferum, No. 114. 



117. S. inerme, n. sp. S. submediocre; circ. lV 2 _ pl° longius quam latum; semicellulis 

 incurvo-cuneatis, dorso incavatis, latere inflato-curvatis; semicellula' trilobatse, lobis 

 erectis attenuatis triangularibus latere curvatis apiee acuto-rotundatis inermibus; medio 

 frondis modice eonstrictum; sinu nullo vel indistincto. A vertiee visum triangulare, 

 lateribus incurvatis, angulis sub-acute rotundatis. *S' unguifero No. 115 propius. 



Long. 42, lat. 26, lat. isth. 17 //. T. XVII, f. 8 (also in Wallich Mscr. No. 

 265, f. :;). 



This is niucli like tbe plant No. 115 without spincs, but bevond this difference 

 the apices of the lobes are rounder and not so acute. Prpbably nearest to 8. corni- 

 culatum Lundell (I)esm. Suec. p. 57, t. III, f. 23) from which it differs mostlv in 

 being sub-lobate. 



118. S. Lundellii, n. sp. S. mediocre, paullo latius quam longuin; semicellulis trapezicis, 

 dorso rotundatis, ventre irregulariter tuinidis externe expansis; sinu brevi acuto; cen- 

 trali j>arte frondis hcvi. Angulis 3 — 4, radiis brevis rectis paullo attenuatis fere ho- 

 rizontalibus superticie striato-rugosis apice truncato-rotundatis produetis. A vertiee 

 visum 3 — 4-gonum; centrali parte rotunde 3— 4-gona glabra. 



Long. 36 — 45, lat. 42 — 46 c. rad.; lat. isth. 12, long. rad. circ. 7 fi. T. 

 XVI, f. 15. 



To the aaithor of the »De Desmidiaceis . . . Suec.» I dedicate this little member 

 of a family upon which he has so well written. (To the chance perusal of Dr. Lun- 

 dells memoir, in which the excellence of the descriptions is but equalled by the 

 elegance of the Latin, I owe my commencement of Desmid-study. W. B. T.). 



119. S. Maskellii, n. sp. S. mediocre, quarta parte longius quam latum, modice eonstric- 

 tum; semicellulis cuueato-trapezicis, dorso leniter convexis, ventre expando-tumidis; 

 sinu nullo: membrana dense et minute granulata. Semicelluhe trilobata 1 , angulis in 

 lobis attenuatis vel brachiis crassis sub-erectis divergentibus apice paullo incurvis pro- 



