OF ARTS AND SCIENCES. 357 



49. Stilophora uhizodes, Ag. Long Island Sound; Wood's 

 Hole, Mass. 



50. Stilophora papillosa, Ag. Chesapeake Bay. 



51. DiCTYOSiPHON FCENicuLACEus, Grev. L. I. Sound northward. 



52. Striaria attenuata, Grev. Flushing, L. I. 



53. PuNCTARiA LATiFOLiA, Grev. New York northward. 



Var. Zosterce, Le Jolis. (P. tenuissima, Harv. Ner.) Same limits. 



54. PuxCTARiA PLANTAGiNEA, Grev. Orient Pt., L.I., jr. G.F.; 

 Boston, 3Ir. G. B. Emerson. 



*55. AsPEROCOCCUs coMPRESSus, Griff. Gloucester, Mass. Col- 

 lected by Mrs. J. T. Lusk. Europe. 



5(i. AsPEROCOCCUS siNDOSus, Bory. Key West; San Diego, Cal., 

 Hassler Exp. 



57. AsPEROCOCCUS echinatus, Grev. Fisher s Island, N. Y., 

 W. G. F. ; Boston, Mr. G. B. Emerson. 



58. Hydroclathrus cancellatus, Bory. Florida. 



CHORDARIACE^. 



59. Chordaria flagelliformis, Ag. New York northward. 

 *G0. CiiORDARiA ABiETiNA, Eiipp. mscr. Not hitlierto published. 



— Fi-onds gregarious or solitary, 3-G inches long ; root scutate ; main 

 axis slightly compressed, and surrounded on all sides by radiating 

 ramuli, 1-2 ir.ches long, tapering at both ends, narrowly linear in outline, 

 solid when young, tubular when old. Related to C. flagelliformis, but 

 easily distinguished by the greater width and compression of the axis, 

 and shortness of the ramuli, which are of nearly uniform length, by the 

 substance, which is much softer than in C flacjdliformis, and the lighter 

 color. It adheres to paper. Oregon, Mr. E. Hall; California. 



61. Chordaria divaricata, Ag. New York to Cape Cod; Cape 

 Aim, Mass. 



Mesogloia. — Three species are mentioned by Harvey as occurrino- 

 on our east coast. Of these, — 



(32 & 63. Mesogloia vermicularis, Ag., is a true Mesogloia, 

 and is occasionally found on Cape Ann, Mass. 31. virescens and M. 

 Zosterce, of the Nereis, belong to the genus Castagnea, Derb. and 

 Sol., and their occurrence on our northern shores needs confirmation. 

 M. virescens occurs at Key West. The species of this genus, as well 

 as of the EctocarpacecE, can be well determined only when fresh or in 

 alcohol, or some of the ordinary preservative fluids. Sterile specimens 

 are almost worthless. 



