340 Dr. Grevizze's Account of a Collection of 
At first sight it has a near resemblance to some states of 
Spherococcus bifidus, but the discovery of the fructification proved 
it to belong to a different genus. In texture and delicacy as 
well as fructification it is nearly allied to Delesseria punctata, 
but the constant dichotomous, linear, smaller frond, and very 
divaricated segments, keep it sufficiently apart. 
The specimens in the present collection are smaller and not 
fertile; yet I think there cannot be a doubt of their being the 
same species. 
( Fucoidee.) 
Genus 19. SCYTOSIPHON. 
1. S. feeniculaceus. Lyngb. Tent. Hydrophyt. Dan. p. 63. t. 14. 
Ag. Syst. Alg. p. 258. ‘Fucus subtilis. Turn. Hist. Fuc. 
t. 234. 
Genus 20. HarrsERrs. 
1. H. polypodioides. Ag. Syst. Alg. p. 262. Fucus membrana- 
céus. Stackh. Ner. Brit. p. 13. t. 6. Turn. Hist. Fuc. 
t. 87. omis 
Genus 21. ZONARIA. 
Rh z. rubra, fronde reniformi, planá, subintegerrimá, fragili, ni- 
tidà, rubrá, lineis monts longitudinaliter densissimè 
notatâ. Tan. III. f. 3. 
In the sea, about the roots of Zostera marina. 
Frond. dull pinkish red, half an inch to one inch in breadth, 
roundish reniform, nearly plain, the margin entire or 
very slightly lobed; surface glabrous, somewhat glisten- - 
ing, densely reticulated, the reticulations minute, arranged 
in close parallel convex longitudinal lines, scarcely per- 
ceptible to the naked eye. There are also a few transverse 
corrugations. 
