KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 25. N'.0 5. 27 



Wallich, No. 1o2) in T. IV, f. 19. In this genus the suture appears to be non- 

 prosilient. 

 2. T. abbreviatum, n. sp. Tr. minimum, circ. 6-plo longius quam latum, rectum; lateri- 

 bus parallelis; membrana glabra; sutura non prosiliente, apicibus 3 — 4-lobulatis, quocjue 

 lobo dente minuto terminante. Incisura mediana brevis, extrorsum ampliata. 



Long. 65—85, lat, 11—15, lat. apic. 13—17 ,//. T. IV, f. 17 (after Wallich 

 Mscr. No. 105). 



»Frond linear, intiated at extremities; showing a eonstriction at the central portion 

 which forms a shallow angular noteh on eacli side. Ends truneated and inflated, the 

 inflated portion forming 3 — 4 shallow lobes, each terminated by a short tootb. A very 

 rare species, of which I have obtained only 2 specimens.» G. C. W. 1. c. 



Eaneegunge, Nov. 1855. 



This little form seerns a triHe anomali tus, when compared with others of the 

 genus, but I think the terminal lobes decide its position. 



Triploceras inay be sub-divided into: 



A. Xyrmechidiam (uipitij/c^, verrucosus; etc.) 



Fronds with rugose or nodose sides; section stellate, or crenato-rotund. 

 Typ. sp. T. gracile, verticillatum. 



B. Bacteridinm {fiuxxriQidiov, bacillum) 



Fronds with plain or smooth sides; section cireular. 

 Typ. sp. T. abbreviatum. 



Gen. 11. Docidium, Bréb. 



(Bréb. in D*Oeb. Diet. IX. p. 711. 1841 (nomen, fide De Toni, Sylloge p. 871); in Iitt. 184C: in Kalfs' 



Br. Desm. p. 155, 1848: Closterium ex p., et Pleurotcenium aurt. nonnull.) 



1. D. mainniillatiun, n. sp. D. parvum; levissime undulatura, fere rectum, regulariter 

 attenuatum, basi inflatum; apicibus truncatis, minute crenatis. Membrana lawis; sutura 

 non prosiliens. Sub inflatione basis 5 — 6 »lnammulis» vel tuberculis instruetum. 



Long. 240—270, lat. bas. 13. It. apic. 9.5. T. II, f. 5. 



One (semicell) only seen! Apparently nearest to D. bacvlum Bhéb. var. ft hexa- 

 gonum Borijesen (Des. Brås. p. 933, t. 2, f. 2, 1890). 

 8. D. perlaeve, n. s. 1). minus, 16 — 18-plo longius quam latum, fere rectum, basi (semic.) 

 inflatum, et supra basin inflatione unica. Leniter attenuatum; apicibus truncatis; prope 

 apices corona dentium (vel crenarum) minutarum. Membrana achroa, bevis. 



Long. 270—300, lat. bas. 17, lat. apic. 10 //. T. II, f. 6. The fact of the little 

 teeth or crenae being below the apex is peculiar. 



3. D. robustum, n. sp. 1). magnum, rectum, vix attenuatum, margine leviter sinuata, basi 

 valde infläta, membrana glabra; apicibus truncatis, tuberculis 30 — 34 (singulatim positis) 

 ornatis, unumquidque supra paullulam rugositatem. \ ersus apices, sub corona tubercu- 

 lorum, incisura parvula incurvata. Sutura prosiliens. 



Long. circ. 700, lat. bas. 63, lat. apic. 50 fi. T. II, f. 8. 



4. D. elatum, n. sp. 1). magnum, rectum; semicellulsB incavatai, maxime crassaa ad basin 

 et apicem; inflatione basali unica; lateribus sinuatis; membrana glabra, sutura prosili- 



