172 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



branchlets, internodes all short, never more than twice as long as broad j 

 antheridia ellipsoidal, not mucronatej cystocarps broadly ovate, on 

 short pedicels. 



On Zostera and other plants. 



Common in Long Island Sonnd and found in several place in Massa- 

 chusetts Bay ; Goose Cove, Squam, Mass. 



The typical form of the species is closely related to P. spinulosa, Grev., found in 

 Scotland and in the Mediterranean and Adriatic Seas, where, however, it does not ap- 

 pear to be at all common. We once collected specimens at Antibes, France, and cer- 

 tainly at first sight it could not be distinguished from P. Harveyi. In the typical P. 

 Harveyi the branches are rather rigid and the branchlets are spine-like and sometimes 

 revolute. As the plant grows old the finer branchlets disappear, and there is left an 

 irregular mass of coarse filaments beset with revolute branchlets, forming the P. arie- 

 tina of Bailey, which is in the Nereis considered a variety of P. Harveyi. It is, however, 

 rather an autumnal condition than a proper variety. The upper portion of the fronds 

 of P. Harveyi are sometimes slender and byssoid, and as it is a well-known fact that 

 the branchlets of Polysiphonice have the power of falling from their attachments and 

 producing new plants, it may be, as has already been suggested, that P. Olneyi is the 

 byssoid condition of P. Harveyi. 



Polysiphonia Americana, Reinsch, Contrib. ad Algolog. et Fungolog., p. 50, PL 33 a, as 

 far as can be judged by the plate, closely resembles some forms of P. Harveyi, except, 

 in the color, which as given by Reinsch is bright pink. It is said by Reinsch to re- 

 semble P. arietina, Bailey, in general appearance, but to differ in the erect, subdichoto- 

 mous filaments, whose joints are bicellular. 



Sec. II. Siphons four, main branches corticated, ultimate branches with- 

 out cortication. 



P. elongata, Grev. ; Phyc. Brit., Pis. 292, 293.— Lobster Glows. 



Fronds dark red, six to twelve inches long, robust, cartilaginous, 

 irregularly branched, lower branches naked, upper beset with closely 

 set, alternately multifid branchlets, which taper at the base and apex, 

 cortications covering all but the younger portions of frond, section of 

 branches showing four large siphons, with secondary siphons and a 

 rather thick cortex j cystocarps ovate. 



Gloucester, Lynn Beach, Squam, Wood's Holl, Gay Head, Mass. 



One of the largest but less common Polysiphonice, which is more abundant in the 

 spring than at any other season. The species is perennial and in late summer and 

 autumn the branchlets fall off, leaving the lower and coarser branches, which persist 

 through the winter, and in the following spring produce at the apices tufts of delicate, 

 deep-red branchlets. It is recognized by its long cartilaginous main branches, which 

 are nearly naked, and which bear tufts of filaments at the apex. The popular name 

 of lobster claws is tolerably appropriate. 



P. fibrillosa, Grev. ; Phyc. Brit., PI. 302. 



Fronds brownish yellow, four to ten inches high, broadly pyramidal, 

 rather robust below, becoming slender above, with an undivided axis 

 or divided near the base into several long, main branches, secondary 

 branches alternate, several times pinnate, nbrillose, with short, scattere d, 



