. Bulletin - United States National Museum. Science. 50 NATIONAL MUSEUM BULLETIN 2 78. 12-0 U-O 15-0 16-0 17-0 Figure 22.—Ratio of total length divided by length of basis of gnathopod 2; a, Caprella septentrionalis, males, n = 47; b, C. septentrionalis, variant males, n=10; c, C. septentrio- nalis, females, n^42; d, C. linearis, females, n=16; e, C. linearis, males, n = 34. Vertical line represents the range, horizontal line the mean, stippled area two standard errors either side of the mean, and white rectangle one standard deviation either side of th
. Bulletin - United States National Museum. Science. 50 NATIONAL MUSEUM BULLETIN 2 78. 12-0 U-O 15-0 16-0 17-0 Figure 22.—Ratio of total length divided by length of basis of gnathopod 2; a, Caprella septentrionalis, males, n = 47; b, C. septentrionalis, variant males, n=10; c, C. septentrio- nalis, females, n^42; d, C. linearis, females, n=16; e, C. linearis, males, n = 34. Vertical line represents the range, horizontal line the mean, stippled area two standard errors either side of the mean, and white rectangle one standard deviation either side of the mean. Variation.—The body of this species varies in the amount of spination, larger individuals tending to be less spinose (compare figs. 23c, 24a, 24b). The peduncle of antenna 1 shows some variability in the density of setules; larger males tend to develop more setules. Distribution.—Type-locality: Albatross sta. 2253, 40°34'30" N., 69°50'45" W., 59 m. Other records: Southeastern New England, Long Island Sound, Vineyard Sound, Great Harbor in Woods Hole, passage between Vine- yard Sound and Buzzards Bay, Cape Cod Canal; to 25 m. New records: St. John's, Newfoundland; Casco Bay, Maine; off Cape Cod, 40°-43° N., 65°-72° W.; 37°31' N., 74°52' W. Remarks.—Wigley and Shave (1966) give an excellent description of C. grahami which they thought to be distinct from C. unica due to the presence of spines on the dorsal surface of the latter species. Mayer based his description of C. unica upon a single immature male which was quite spiny; however, recent material collected from the area near the type-locality has yielded numerous specimens which intergrade between the smooth and spiny forms. Since the other characters of these two species agree quite closely and intergrades are present between the two body forms, C. grahami is suppressed as a junior synonym of C. Please note that these images are extracted from scanned page images that may have be
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