MARINE ALG OF BEAUFORT, N. C. 401 
In Newport River at “Green Rock,’’ near the entrance to Core Creek, eight species 
were found as follows: 
Ulva lactuca var. latissima, Gracilaria multipartita. 
Ectocarpus duchassaingianus. Hypnea musciformis. 
Dictyota dichotoma. Laurencia tuberculosa var. gemmifera. 
Gelidium crinale. Polysiphonia sp. 
In Bogue Sound, in the vicinity of Morehead City and on the north shore of Bogue 
Banks, the same conditions were found as were noted on the marshes north of Pivers 
Island, and a similar scarcity of algae was observed. Owing to the difficulty of navigating 
here at low tide and the fact that conditions were so unfavorable for the growth of alge, 
this sound was not explored further. 
In North River near Lenoxville there were found six species, as follows: 
Ulva lactuca var. latissima. Gracilaria confervoides. 
Ectocarpus mitchelle. Gracilaria multipartita. 
Dictyota dichotoma. Hypnea musciformis. 
In Core Sound near Marshallberg, Lecklys Island, and Davis Island, there were 
found the following ro species: 
Ulva lactuca. Hypnea musciformis. 
Dictyota dichotoma. Gracilaria confervoides. 
Erythrotrichia carnea. Gracilaria multipartita. 
Gelidium crinale. Chondria sedifolia. 
Agardhiella tenera. Dermatolithon pustulatum. 
In Pamlico Sound at Ocracoke there were found the following 16 species: 
Chroococcus turgidus? Acrochetium virgatulum. 
Lyngbya semiplena. Gelidium crinale. 
Spirulina sp. Eucheuma gelidium, 
Enteromorpha prolifera. Gracilaria multipartita. 
Ulva lactuca. Hypnea musciformis. 
Ulvella lens. Chondria dasyphylla. 
Gomontia polyrhiza. Spyridia filamentosa. 
Ectocarpus mitchelle. Dermatolithon pustulatum. 
Although the records at places far from the laboratory were made from only one or 
two expeditions to these localities, they are believed to be fairly complete, since a 
thorough search was made at each place, and a second trip always verified the results 
obtained on a previous visit. The number of individuals at these places showed the 
same scarcity as the number of species. 
It will be observed that Ulva lactuca, Gracilaria confervoides, G. multipartita, and 
Hypnea musciformis were most often present. No locality permitting the growth of 
any alga was found which did not bear at least three of these species. 
The decrease in the alge as we leave the inlet may, with considerable assurance, be 
ascribed to two factors, decreased density and increased turbidity. The former probably 
plays a part and may determine the limits of some of the species found only near the 
inlet, but the main factor limiting most of the species is undoubtedly the greatly increased 
turbidity. Even the parts of this region that have sandy and shelly bottoms have a 
thick covering of mud, and the water throughout the harbor and sounds is very turbid. 
