. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 132 G Canadian Arctic Expedition, 1913-1918 numerous flake-white dots, i-ometimes with small white spots at the outer base. Lips and stomodaeum bright red, disk usually convex, yellowish, with faint white radii, and often with white spots surrounding the bases of the tentacles. Fig. 18. Edwardsiella sipunculoides (Stimpson). Transverse section of a perfect mesentery of a specimen from Alaska; b, basal muscle. After Torrey. Length of the largest specimens, when in full expansion, about 5 inches (125 ; in diameter ab
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 132 G Canadian Arctic Expedition, 1913-1918 numerous flake-white dots, i-ometimes with small white spots at the outer base. Lips and stomodaeum bright red, disk usually convex, yellowish, with faint white radii, and often with white spots surrounding the bases of the tentacles. Fig. 18. Edwardsiella sipunculoides (Stimpson). Transverse section of a perfect mesentery of a specimen from Alaska; b, basal muscle. After Torrey. Length of the largest specimens, when in full expansion, about 5 inches (125 ; in diameter about 4-5 mm.; when contracted about 36-15 mm. in length. Some specimens {No. 108j from near Eastport, at Clark's ledge, differed considerably from the typical ones in colour. Naked parts of the column were clear salmon-colour; no spots on the capitulum, but light lines, due to the mesent- eries; stomodeeum pink; tentacles pale salmon, with a darker salmou-coloured central line; disk salmon-coloured, no spots. Tentacles are about 36, closely crowded in two rows, very slender and pointed in extension; length about twice the diameter of the disk, more numerous and more slender than usual in typical specimens of the same size. The epidermal coating of the scapus is firm, obscurely 8-grooved, colour dark yello\vish brown; length in life about 50 mm.; diameter, -1-5 mm. These were found under a stone in a tide-pool, some were lightly attached to small pebbles by the naked aboral end or physa, probably by adhesive mucous. Torrey (op. cit., 1902) has described the structure of this species with good figures. He found as many as 32 small rudimentary mesenteries in a specimen having 25 tentacles (PI. XXVI, fig. 9). They were irregularly arranged; the number between adjacent perfect mesenteries varied from 4-6; one occurred between each pair of directives. The muscle pennon on the perfect mesenteries is very thick with branched supports, and is restricted to the inner part of the mesentery
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
