396 BULLETIN OF THE BUREAU OF FISHERIES. 
A comparison of the seasonal distribution of the Beaufort species which are found at 
Woods Hole and at Naples is given below, the numbers referring to the number of species 
and varieties common to Beaufort found in the other localities at the respective seasons: 
Beaufort summer flora. Beaufort spring flora. Beaufort perennial flora. 
aie s P s Pp. Ss P 
a um- eren- . . uim- eren- . uum- eren- 
Winter ier Saul Winter.| Spring. ier: SENT. Winter. 7B Seay 
WWO0ds Halen earn: pccdaweciys ual erage oie 13 3 I I 16 Af) 2-eatasy 7 4 
Waplesror Gorn see ners ewe 9 3 2 
In this case many of the species recorded above for winter at Naples are found there 
from autumn through spring, and some of the species recorded for summer at Woods 
Hole are found there in spring and summer. In general, though, it will be seen that the 
relationships of the Beaufort flora are greater with that occurring at Woods Hole in 
summer and at Naples in winter. 
The relations between the occurrence of any single species and the temperature are, 
however, frequently different in different localities. This is shown below where there is 
given the seasonal distribution of five species at Beaufort, Naples, and Woods Hole, 
with the range of the average temperature, in degrees centigrade, recorded in each 
locality during the time of occurrence of each species: 
Beaufort. Naples. Woods Hole. 
(Chamnia parvnlacc castes en: April to December, 17.5 to | Autumn to spring, 25 to 8 
i 27.9 to 11.1°. to 19°. 4 
Chondria dasyphylla................ April to February, 17.5 to | Autumn to spring, 25 to 8 
é Oat 27.9 to 9.6°. to 19°. 
Chondria tenuissima................ April to June, 17.5 to 25.2°... Summer to autumn, 20 to 27 | }July to October, 20.43 to 20.97 
to 18°. to 15.26°. 
Dasya'pedicellata ly. 4.5 <crcepiseeie December to June, 11.1 to | Spring to summer, 8 to 27°. . 
9.6 to 25.2". 
Polysiphonia denudata ...-......... July to October, 27.9 to 19.2°.| Perennial, 8 to 27°.........-- 
It will be observed that, while all of these species have the same seasonal distri- 
bution at Woods Hole, they occur at different seasons at Beaufort and at Naples, and, 
what is more important, they appear and disappear at different temperatures in each 
of the three localities. Further studies are needed to explain these facts. 
Howe (1914) lists the following species found at and near Orient, N. Y., as having 
been gathered in Long Island Sound during the month February 7 to March 7: Ulva 
lactuca, Chetomorpha linum, Sargassum filipendula, Agardhiella tenera, Champia parvula, 
Polysiphonia migrescens, Ceramium rubrum, Dermatolithon pustulatum. While further 
search would probably increase the number of perennial species listed for Beaufort, 
there is no evidence that Champia or Polysiphonia persists there during the winter. 
VERTICAL. 
The vertical distribution of the alge at Beaufort is exceedingly limited, the total 
range of all species growing in the harbor being only about 2.2 m., from the usual high- 
tide line to about 1.4 m. below the usual lowest low tides. In fact, except at Shackle- 
ford jetties and the outermost jetty at Fort Macon, where the water is clearer and the 
alge extend deeper, the great majority of alge occur within a zone of 90 cm., from the 
level of the usual lowest low tide to 90 cm. below this. A careful search was made on 
