MARINE Al&M 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. 

 Ectocarpus duchassaingianus. 

 Dictyota dichotoma. 

 Gelidium crinale. 



Gracilaria multipartita. 



Hypnea musciformis. 



Laurencia tuberculosa var. gemmifera. 



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 Fivers 

 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 algae, 

 this sound was not explored further. 



In North River near Lenoxville there were found six species, as follows : 



Ulva lactuca var. latissima. 

 Ectocarpus mitchellae. 

 Dictyota dichotoma. 



Gracilaria confervoides. 

 Gracilaria multipartita. 

 Hypnea musciformis. 



In Core Sound near Marshallberg, Lecklys Island, and Davis Island, there were 

 found the following 10 species: 



Ulva lactuca. 

 Dictyota dichotoma. 

 Erythrotrichia carnea. 

 Gelidium crinale. 

 Agardhiella tenera. 



Hypnea musciformis. 

 Gracilaria confervoides. 

 Gracilaria multipartita. 

 Chondria sedifolia. 

 Dermatolithon pustulatum. 



In Pamlico Sound at Ocracoke there were found the following 16 species: 



Chroococcus turgidus? 

 Lyngbya semiplena. 

 Spirulina sp. 

 Enteromorpha prolifera. 

 Ulva lactuca. 

 Ulvella lens. 

 Gomontia polyrhiza. 

 Ectocarpus mitchellse. 



Acrochaetium virgatulum. 

 Gelidium crinale. 

 Eucheuma gelidium. 

 Gracilaria multipartita. 

 Hypnea musciformis. 

 Chondria dasyphylla. 

 Spyridia filamentosa. 

 Dermatolithon pustujatum. 



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 algae 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. 



