THE MAin>'K ALd.*: OF (HERXSEY 20 



This species, found growing in a rock-pool in a moderately 

 ex])osed situation in September, is new to Britain. It is a 

 native of the Mediterranean, vvbence it has travelled to the 

 shores of Guernsey. The following- description is taken from 

 l)e loni, p. l(J()2 :"- 



Frond Heshy-gelatinous ; stem round to compressed, loosely 

 dicliotomous, suh-fasligiate ; segments })atent, narrow linear, 

 or cmieate, with obtuse ends mostly elongated. 



Habitat: Ligurian Sea at Nice, the 'Jyrrhean Sea, coasts of 

 S.ir.linia. Ionian Isles. Sicily, and Adriatic Sea. 



Frond -4-10 cm. long, more or less regularly dichotomous, 

 fastigiate ; segments above the axils rounded, distinctly patent 

 or sub-divaricate, below the axils linear, somewhat wedge- 

 shaped, 2-5 mm. In-oad. Tlie lower portion of the frond is 

 generally narrower, the middle ])arts wider, the extremities 

 again narrower. The terminal branches often 6-10 mm. long, 

 linear attenuate but obtuse, sometimes short cuneate obtuse, 

 sometimes sub-cornutely branched. Structure and fructifi- 

 cation of the genus. Inner threads very dense, peripheral 

 ones immei-sed in a small quantity of mucilage. Substance 

 gelatinous-tleshy, thick and firm when dry, only slightly 

 cartilaginous. Dried specimens adhere firmly to the paper. 

 When fresh of a purple, almost wine colour. 



PoLViDEs KOTUXDUS Grcv. [E. 1. S. 5.] W. 5. Shallow^ 

 sandy pools and rocks. 



Petrucelis cRiENTA J. Ag. [E. 10.] N. 1. E. 2. S.W. 



Cruorielj.a Dubyt Schm. {Peyssonnelia Duhyi Crn.). [E. 2, 

 10. S. 5. 1 N. 2. E. 11. 



Htldenbrandtia prototypus Nardo. c. Rocks and stones. 



ScHMiTZiELLA ENDOPHL(EA Born. & Flah. On Clad, pellucida. 

 [S. 2. N.W. 2.] N. 2. r. 



CuoREONEMA TiiURKTii Schm. N.W. 4. r. 



Melobesia earinosa Lam. [On Chy. kali form is. E. 6] ; and 

 on Zostera and Clad, rupestris. c. 



M. Lejolisii Kosen. [On Zoster a. N.W. 2. S. 2.] 



LiTHOPHYLLUM (DeRMATOLTTHON) PUSTITLATITM Fosl. {3felc- 



hesia pustulata Lam. and M. verrucata Lam.). [N.W. 2, 4. 

 E. 10. S. 2.] W. 5. N.W. 5. — var. CorallirKS Fosl. (Melo- 

 besia CorallincB Crn.). [S. 5.] — var. Laminaria; Fo.L - 

 {M. Lamiiiariw Crn.). [E. 2, 10.] 



L. iNCRUSTANs Phil. c. On rocks. 



L. EXPA>8UM Heydr. [E. 2, 10. N. 2. N.W. 2.] N.AV. 1 

 On rocks. 



L. LiCHEXOiDES Phil. f. Lining rock-pools and on other alg3.\ 



LiTHOTHAMXTOX POLY.MORPHUM Arcsch. {PhymatoUlhuu poi'j- 

 morphum Fosl). c. On rocks. 



L. Lexormandi Fosl. c. On rocks, stones, and limpet-shells. 



Eptlithon membraxaceum Heydr. (Lith. memhranaceur 

 Fosl. and L. rorficiforme Fosl.V [E. 10. S. 5. N.W. 4 

 N. 2.] S. o. E. i^ t). W. 6. On other algie. 



CuKAl.IJNA Ol'FK'INAI.lS L. C, 



