66 MESSES. W. WEST AND G. S. WEST ON 



Var. ALASTRENSE, nov. var. (PI. VII. fig. 25.) Yar. minor, granulis majoribus in toto 

 ambitii prsedita. 

 Long.=lat. = 13"5 ju ; lat. istlim. 4*8 fx ; crass. 7"7 /n, 

 No. 86. 



102. CosMARiTJM TRIORDINATUM, noY. sp. (PL YII. fig. 27.) C. parvum, pauUo latins 

 quam longum, profunde constrictnm, sinu lineari extrenio non ampliato ; semi- 

 cellulse oblongae, lateribns rotnndatis, apicibns snbrectis, lateribus grannlis acntis 

 6-7, grannlis intra n'arginem lateralem ntrnmqne snbirregnlariter ordinatis, grannlis 

 ad apicem mnlto minoribns, in centro seriebns tribns verticalibns grannlornni 

 magnorum, qnatnor in serie utraqnaque ; a vertice visge ellipticse, in medio utro- 

 biqne leviter inflatse crenis tribns instructse, ad polos rotnndatos grannlis acntis 

 (circa 6) et aliis intra marginem snbirregnlariter dispositis; a latere visae depresso- 

 globossB (IJ-plo latins qnam longins), lateribns 4-crenatis. 



Long. 25-27 m ; lat. 29-31 1^ ; lat. isthm. 10-5-11-5 [x ; crass. 17-18*5 ^u. 

 No. 0. 



103. CosMAMUM KiECHNERi, Bocrg. Bidrag til Bornholms Desmidic-Plora, p. 113, 

 tab. vi. fig, 3. {C. tracliyplem'um, Lnnd., var. verrucosum, Kirchn. Alg. Scbles. 

 p. 151.) 



Var. UNIEORME, nov. var. (PI. Vll. fig. 18.) Var. minor, semicellnlis papillis minus 

 nnmerosis et plus regnlaribus, papillis in ambitn toto (non reductis ad apicem), in 

 centro verrncis seqnalibns 7 (6 periphericis, 1 centrali). 



Long, sine pap. 49 ^ ; lat. sine pap. 41 f.i ; lat. istlim. 15 fx ; crass. 31 p.. 



No. 0. 



104. CosMARiiJM TRACHYPLEURTJM, Lund. Dcsm. Succ. p. 27, tab. ii. fig. 12. 



Var. SPINOSUM, nov. var. (PI. VII. fig. 17.) Var. semicellnlarnm angulis inferioribus 

 minus rotund atis, lateribns spinis brevibns et intra marginem seriebus (circ.) 3 

 spinarimi brevium obsessis, apicibns grannlis parvis acntis paucis ornatis ; semicel- 

 lulse a vertice visas angustiores. 



Long. 42-43 ^t ; lat. sine spin. brev. 38-38'5 a* ; lat. isthm. 12-5-13 n ; crass. 22 ^i. 



No. 36. 



This variety seems to connect C. fpachypleuriim, Lund., and C. Kirchneri, Boerg. 



105. CosMARiUM TAxiCHONDRUM, Lund., Dcsm. Suec. p. 39, t. ii. fig. 13. 

 Long. 39^*; lat. 32-5^* ; lat. isthm. 9-5 ^«; crass. 20^1. (PL VII. fig. 2.) 

 No. 0. 



Var. EMARGINATUM, nov. var. (PL VII. fig. 3.) Var. semicellnlis supra angulos in- 

 feriores biundulatis, in centro grannlis in seriebns tribns horizontalibus, 4 iu serie 



