KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 37 



The New Zealand form approacbes to Rales' Brit. Desm. tab. 23, fig. 12, by its 

 skört rays, but its encl margins are more convex, as in Boldt's /?. 



6. S. sagittariuni nov. spec. Tab. 4, tig. 6 — 7. 



S. incisura mediana mox ampliata; semicellute introrsum subglobosoe dorso truncato- 

 rotundata?, angulis superioribus repente in radium gracilem paullo deorsum arcuatum, 

 elongatum margine superiore (et laterali) 6-denticulatum, inferiore aateni nudum apice 

 3 — 4-dentatum, dentibus 1 — 3 vulgo adscendentibus; e vertice visie rotundatse 7 — 8-radiata; 

 radiis margine 6-denticulatis incisura inter radios excavato-obtusa, infra incisuram (ad 

 basin radiorum) granulis binis. Zygosporse globoso-angulosa.*, circiter lO-edrse, lateribus 

 rectis, angulis in spinas apice 2 — 3 furcatas vel repetite dichotomas productis. 



A St. cyrtocero praecipue differt omnibus aculeis non emarginatis, radiis e vertice 

 visis longioribus non curvatis, a St. Ophiura coronulå dorsali nullå (ceteris exceptis), a »SV. 

 macrocero Wolle parte centrali i*epente in radiis producta; a Staurastro Rotula Nordst., 

 cui proximum mihi videtur, praecipue differt radiis non strictis, aculeis in 5 — 6 (non 3 — 

 4) series ordinatis, granulis ad basin radiorum binis (parvis) non singulis majoribus. 



Long. sin. rad. 28 ,«; lat. sin. rad. 18 ,«; lat. cum rad. 50 — 62 ,»; lat, istkm. 10 f*,. 

 Diametr. zygospor. sin. spin. 43 — 53 ,u, — c. spin. 76 — 102 ,u. 



To judge by a drawing of living specimens by Mr. A. Löfgken, the back of tke semi- 

 cell of St. Rotula in my Desm. Brås. tab. 4, fig. 38 is too kigh and tke crenations in the 

 margin skould kave been skärper (tke minute spines would probably kave been broken off). 



7. S. assurgens nov. sp. Tab. 4, lig. 8. 



S. sinu mediano amplo rectangulari valde constrictum; semicellulai e basi angusta 

 late triangulares, lateribus leviter convexis crenulato-exasperatis, dorso subplano (levissime 

 convexo) serie prominentiarum (vel verrucarum) parvarum curtarum emarginatarum ob- 

 sessse, angulis (superioribus) in radium incurvum subcurtum (long. = 1 / 2 lat, corporis) 

 gracilem margine denticulatuni apice 3 — 4 aculeis korizontaliter directis vel assurgentibus 

 munitum; e vertice visse fusiformes medio utrinque in tumorem obtuso-rotundatum valde 

 dilatataj, seriebus verrucarum emarginatarum (ut descript.) semicellularum lanceolate dis- 

 positis praeditaa, radiis denticulatis apice 3—4 furcatis. 



Long. 52 ,u; lat, 95 — 100 ,«; crass. 30 ,«; lat. isthm. 10,."> ,«; long. acul. ad 4,5 «. 



Lake Pearson (2), rarissime. 



By tke direction of tke spines in tke apex of its rays and by tke elevation in tke 

 centre of tke semicells, tkis plant will be known from its alliecl species, St. gracile, Se- 

 baldii, cyrtocerum, macrocerwn (grallatoriuin) etc. It differs from St. leptocladum Nordst. 

 by tke swollen and not elongated base of its semicells. 



8. S. contortum Delpont. Desm. ital. p. 152, tab. 11, tig. 53 — 55. 



(i pseudotetracerum nov. var. Tab. 4, fig. 9. 



Minor; semicellula3 dorso leviter concavas vel levissime convexa;, radiis saspe strictis 

 apice aculeolis ininimis; membrana non dentato-spinulosa sed granulis subacutis ornatae. 

 Forma trigona. (Fortasse melius forma Staurastri tketraceri sit). 



