420 BULLETIN OF THE BUREAU OF FISHERIES. 
Florida; southern California; warmer waters generally. 
Two or three small clumps, on rocks of Shackleford jetty, Beaufort, N. C., April, 1908. Fronds 6 to 
23, cm. long. 
This, being a southern species, might be expected to occur at Beaufort throughout the summer, but 
has been found only once, in April. Even then it was by no means a conspicuous part of the spring 
flora. It is distinguished from E. intestinalis, which it resembles, by having smaller cells arranged in 
regular series, a somewhat more delicate membrane, and a thicker wall between the cells. 
3. Enteromorpha intestinalis (Linnzus) Link. 
Ulva intestinalis, Linnzus, 1755, D. 432. 
Enteromorpha intestinalis, Link, 1820, p. s. 
Enteromor pha intestinalis, Harvey, 1858, p. 57 (in part). 
Ulva enteromor pha var. intestinalis, Farlow, 1882, p. 43. 
Enteromor pha intestinalis, Wolle, 1887, p. 107, pl. 125, f. 9-10. 
Enteromorpha intestinalis, De Toni, 1889, p. 123. 
Enteromorpha tmtestinalis, Collins, 1909, Pp. 204. 
P. B.-A. No. 464. 
Frond simple or having at the base a few branches similar to the main frond, or occasionally a few 
proliferations above; length varying from a few centimeters to several meters; diameter 1 to 5 cm.; at 
first attached by a short, cylindrical stipe, but soon detached and floating; cylindrical or expanding 
above, more or less inflated, often much crisped and contorted, and irregularly and strongly constricted; 
cells ro to 16 mic. in diameter, in no regular order; thickness of membrane varying from 50 mic. below 
to 20 mic. above; cells in cross section 12 to 30 mic. 
Along the shores of North America, except, possibly, the south Atlantic coast; salt water lakes of 
western United States; Brazil; Europe; Japan. 
Fairly abundant on rocks of Fort Macon jetties, Beaufort, N. C., December, 1908. 
A very variable species, of which many forms have been described; some of these in fresh water. 
4. Enteromorpha linza (Linnzus) J. Agardh. 
Ulva linza, Linnzus, 1753, vol. 2, p. 1163. 
Ulva linza, Harvey, 1858, p. 59. 
Enteromor pha linza, J. Agardh, 1882, p. 134, pl. 4, £. 110-112. 
Ulva enteromorpha var. lanceolata, Farlow, 1882, PD. 43. 
Enteromorpha linza, De Toni, 1889, p. 124. 
Enteromorpha linza, Collins, 1909, p. 206. 
P. B.-A. Nos. 16, 967. 
Frond lanceolate or linear lanceolate, simple, 1 to 5 dm. long, 1 to 20 cm. broad; stipe short, 
hollow; upper part of the frond flat, the membranes grown together as in Ulva, except at the edges, 
where they remain free. ‘ 
Maine to West Indies; Alaska to California; South America; Europe; Tasmania. 
Abundant on rocks and shells in harbor and on jetties at Fort Macon and Shackleford, Beaufort, N.C., 
March to May, 1907-1909, at about low-water line; fairly abundant at about water level on buoy, Port 
Royal, S. C., August, 1909. 
The forms of this species have been divided under forma crispata, with edges much crisped and 
folded, and forma Janceolata, edges even or folded, not crisped. Only the latter of these occurs at Beau- 
fort. The smaller specimens look like forms of E. intestinalis, but in the latter the frond, though often 
collapsed, is tubular throughout; in E. linza the two membranes adhere except at the edges, where there 
is a narrow, open space, around which the cells are arranged in cross section nearly in a circle. Different 
plants vary greatly in their appearance, but the species is easily recognized by the above characters. 
Genus 2. Ulva Linnzus. 
Ulva, Linnzus, 1753, vol. 2, p. 1163. 
Frond membranaceous, flat, consisting of two layers of cells, in any of which, except 
those in the thickened base, zoospores or gametes may be formed, issuing through an 
opening in the surface of the fronds, attached or free floating; surface entire or perforate. 
Marine. 
