KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 25. N:0 5. 59 



natis (magnitudo granulorum major apud marginem). A fronte habitu prope C. cyc- 

 lico, Lundell (Desni. Suec. p. 35, t. III, f. 6 c). 



Long. et lat. 53, lat. isth. 28 fi. T. VIII, f. 48. 



60. C. pseudoprotuberaiis, Kirchn. (Alg. Schles. p. 150, No. 324; C. polygonum forma 

 Reinsch, Contr. Alg. Fung. p. 89, t. IX, f. 5, non Nägeli) forma. 



Long. 39, lat. 30, lat. isth. 8 /u. T. VIII, f. 49. 



Hardlv so angular as the type; niembrane at the isthmus incrassate. 



f. typica. Long. 41, lat. 36, lat. isth. 8.5 //. T. X, f. 6. 



About ' 7 th part larger than the German form, outline similar. Also Wallich 

 Mscr. No. 137. This sp. seems near to Cos. sulcatvm Nord. (Alg. Sandv. p. 13, t. I, f. 18). 

 Tittaghur; Julv 1855, G. C. W. 



61. C. scabrolatiim, n. sp. C. submediocre, paullo longius quam latum, depresso-ovale ; pro- 

 funde constrictum, sinu lineari, angnsto, externe parum ampliato; semicellula? semi- 

 circulares, apice truncatae 6-crenata?, basi rotundatae snpra leniter attenuatse; lateribus 

 apud basin subito angulata*, supra emarginationibus magnis circ. 4 instructae; mem- 

 brana in ventrem laevi, apud margines seriebus concentricis 4 granulorum, et sub- 

 emarginationibus verrncis 4 — 5, etiam sub apice granulorum 6 (1 sub quaque crena), 

 ornata. Specimen unieum observatum. 



Long. 37, lat. 32, lat. isth. 11 /u. T. VIII, f. 50. 



The lateral emarginations much resemble those in C. quadrifarium Lind. (Desm. 

 Suec. t. III, f. 12), also the lateral verruca\ but the rest of the semicells and the 

 apices are wholly different, and the centre is (apparently) not tumid. 



62. C. Portiannm, Archer (Xat. Hist. Rev. Dubl. p. 19, t, I, f. 8, 9, 1860) f. attenuata. 

 C. attenuatum; minor et gracilior quam f. typica. 



Long. 32, lat. 24, lat, isth. 9 ju. T. VIII, f. 51. 



63. C. triceps, n. sp. C. parvum, lY 2 -pio longius quam latins; truncato ovale; medio mo- 

 dice constrictum; semicellulae truncato-pyramidatae, basi rotundatae inde attenuataa; apice 

 trtmcata?, angulis superioribus rotundatis; semicellula? medio tumöre (circulum granu- 

 lorum circ. 7 ferente), et sub apice nodulis tribus, ornata?; in ca?teris membrana hevi. 

 (Noduli apicales in rugositatem membrana? positi?). Sinus sub-brevis, parum apertus, 

 extrorsum ampliatus. Cellula a fronte tantum observata. 



Long. 32, lat. 24, lat. isth. 10 fi. T. VIII, f. 52. 



Probably nearest to C. Aitchisonii Schaarsch. (Afghan. Alg. p. 246, t. V, f. 20), 

 but differs in the central ornate inflation, and the apical nodules; it is also near to 

 C. armatum Josn. (Burm. Desm. p. 646, t. XXIV, f. 23, al. lig. excl.) from whicli it 

 differs in the outline, the position of the nodules, the sinus, and the absence of la- 

 teral teeth. 



64. (\ Gangense, n. s]>. C. minns, fere quarta pars longius quam latius, profunde con- 

 strictum; rotundato-quadratum; semicellube depresso-quadrangulares, basi subito et 

 supra late rotundatae, apice rötundato- truncatae; margine crenato-undulata 1 ; membrana 

 gemmulis conicis (in series 4 concentrice, singuli non tecte, positis) ornata; pars cen- 

 tralis frondis kcvis; incisura mediana aperta, linearis, externe \ ix anipliata. 



Long. 34, lat. 27, lat. isth. 10 .«. T. VIII, f. 55, 



