KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 5. 89 



/?. quadrata, n. f. F. lobis inferioribus apice truncatis, bidentatis. Forma löborum in- 

 feriorum ut fere Mic. inciscs accedens. Fröns longior quam lata. 

 Long. 56, lat. 54, lat. isth. 10, lat. lob. pol. 44 /u. Fig. 3 b. 

 /. expansa, n. f. F. lobis inferioribus expansis, medio laterum ineavatis, angulis (qui- 

 busque) bidentatis; lobo polari apice rotundato, utroque fine unidentato. 

 Long. 56, lat. 52, lat. isth. 12, lat, lob. pol. 40 ,«. Fig. 3 c. 

 d. infläta, Wolle. (Torrey Bull. Suppl. 1876; Desm. U. S. A. p. 116, t, XXXVII, 

 f. 9). F. lobis inferioribus inclinato-truncatis, angulis unidentatis; lobus polaris ut 

 in f. typica, sed basi magis latior. 



Long. 58, lat. 60, lat. isth. 12, lat. lob. pol. 42 fx. Fig. 3 d. 

 Forma? monstrosa' in figuras 3 f et g delineatae sunt. 



Speaking of the varieties and type, G. C W. writes in Mscr. 1. c: »Both varie- 

 ties are so common at Barrackpore and at Raneegunge that I can safely assert they 

 are distinct from SI. oscitans, being mature and fixed forms. This is shewn in spe- 

 cimens in which the young segments are interposed between the old.» This was writ- 

 ten in 1855, but in 1860 Dr. W. had changed his opinion, and united the three spe- 

 cies oscitans, pinnatifida, and incim (under Hassalls genus Holocystis) as varieties of 

 H. oscitans! I believe these species to be well-founded, as perfectly distinct, Wallich 

 gives the dimensions as lat. et long. 50 //. The Euasttum didymacäntkum Näg. (Einz. 

 Alg. p. 123, t, VI h, f. 1 = Tett. didyrhacanthum Archer, in P. Inf. p. 725) is but a 

 form of this species. 



4. M. incisa, (Bréb.) Ralfs (Br. Desm. p. 211; Euosttum incisum, Bréb. in Menehii. 

 Synops. p. 216; Kutz. Phyc, Germ. p. 134; Eu. crux-melitensis (fötma juvenilis /) Ekr. 

 Inf. t. XII, f. 3 c; Holocystis oscitans? Hassall, Br. Fr. Alg. t. XC, f. 3). Formae: 

 or. typica. Long. 50, lat. 50, lat. isth. 8 — 9, lat. lob. pol. s. sp. 3(5, crass. 12 t u. 



T. VI, f. 8, 10. 

 (i. Wallichiana, n. f. F. lobis basalibus truncatis, angulis inferioribus dejecto-dentatis, 

 angulis superioribus rotundatis. (Holocystis incisa var. fi, Wallich Desm. Beng. 

 p. 276, t, XIII, f. 6; W. Mscr. No. 90).' 



Long. 48 — 53, lat, 45 — 50, lat, isth. 10 — 11, lat, lob. pol. s. sp. 40, crass. 

 11—13 ,m. Fig. 7, 9. 

 /. aculeata, n. f. F. lobis basalibus latere profunde ineavatis, angulis protentis; uno- 

 quoque angulo aculeo convergente munito. 



Long. 52, lat, 60, lat, isth. 14, lat, lob. pol. s. sp. 44 ,w. Fig. 11. 

 (Wallich, 1. c. f. 4; Mscr. No. 86). llab. Puttah Ghåt Tank, Oct. 1854; 

 Raneegunge, Nov. 1855. 



With the knowledge of subsequent research and observations before us, we can 

 hardly, at this date, consider these forms (or, as suggested by Dr. Wallich p. 276, 

 Mic. quadrata Bailey likewise) as varieties of M. oscitans, Ralfs. 



5. M. truncata, (Corda) Bréb. (Ralfs Br. Desm. p. 75, t, VIII, f. 4, t, X, f. 5; Cosma- 

 rium truncatum, 0'orda Alm. Carlsb. p. 121, t. II, f. 23, 24; K. rota Ehr. Inf. t, XII, 

 f. 1 g; E. semiradiatuni. Bréb. in Mengh. Synops. (sub E. tota juniot Mengh.) p. 215; 

 E. scutum, Focke, p. 64, t, I, f. 14, etc). 



K. Sv. Vet. Akad. Handl. Band. 25. N:o 5. 12 



