856 PROCEEDINGS OP THE AMERICAN ACADEMY 



OIney, is a monstrous form of L. saccarhina, with abnormal develop- 

 ment of the midrib. I have seen a similar monstrosity in Agaruin 

 Turneri. 



36. Lamlnaria digitata, Lam. of Harvey's Nereis Am.-Bor. — 

 Under this head are included two, and possibly three, ditferent species 

 of our coast. One seems to be the L. JlexicauUs., Le Jolis, of Europe. 

 It is possible that some of the plants belong to L. Chustoni, Edm. 



What is the southern limit of the digitate species on our eastern coast'} 



37. Agarum Turneri, Post, and Rupr. Nahant, Mass., and 

 northward ; north-west coast. — WJiat is the fruit of this plant ? The 

 plate No. V. of the Ner. Am.-Bor. represents this plant as having 

 tetraspores. If such is the case, which is very doubtful, the plant is 

 far removed from Laminaria, the fructification of which has been 

 thoroughly studied by Thuret. 



Agarum pertusutn, Mert., and A. Gmelini, judging from the plates in 

 Postels and Ruprecht, are varieties of A. Turneri. 



38. Tiialassiopiiyllum Clathrus, Post, and Rupr. North-west 

 coast. — Fruit ? 



39. Chorda filum. Stack. New York northward. 



40. Chorda (Scytosiphon) lomentarius, Lyngb. Whole east- 

 ern coast. — California ? 



DICTYOTACE^. 



Haliseris. — I have no specimens from the United States, but no 

 doubt some of the AVest Indian species, as H. Justii, plagiogramma, 

 delicutula, &c., occur on our coast. 



41. Padina pavonia, Lmx. North Carolina, fide Rev. M. A. 

 Curtis; and southward. — Northern limit'? 



P. Durvillcei, Bory. — Possibly only a form of the last. May be 

 expected in Southern California, as it occurs in Magdalena Bay, where 

 it was collected by the Ilassler Expedition. 



42. ZoNARiA FLAVA, Ag. San Diego, Cal., 3fr. D. Cleveland. 

 *43. ZoNARiA INTERRDPTA, Ag. California, Australia, C. B. S. 



44. ZoNARiA LOBATA, Ag. Key West. 



45. Taonia? Schrgederi, Ag. Florida, Br. JE. Palmer. 



46. DiCTYOTA FA SCI OLA, Lam. Florida. 



47. DiCTYOTA DicnoTOMA, Lam. Charleston, S.C., and southward. 



48. DiCTYOTA ciLiATA, Ag. Key West. 



Bictgota crenulata, Ag. Was collected in Cuba by Mr. C' Wright. 

 It probably will be found at Key West. 



Bictyota Brongniartii, Ag. Nassau, Br. E. Palmer. 



