. Contributions to Canadian biology and fisheries. Fisheries; Marine biology. 13 Canadian waters exceed those of the New England littoral, where they range from 4 to 5 mm. (Agassiz, 1882, p. 28fi), hut are smaller than European specimens, which \ar\' in length from to 7 1 mm. (, 1905, p. 118). At the time of exclusion from the egg membrane differentiation of the emhr\()nic median fin is slighth' indicated by a narrowing of the membrane in the region of the caudal peduncle. The pectoral fins are only rudimentary folds, but generally rays are discernible in them and in the inferior
. Contributions to Canadian biology and fisheries. Fisheries; Marine biology. 13 Canadian waters exceed those of the New England littoral, where they range from 4 to 5 mm. (Agassiz, 1882, p. 28fi), hut are smaller than European specimens, which \ar\' in length from to 7 1 mm. (, 1905, p. 118). At the time of exclusion from the egg membrane differentiation of the emhr\()nic median fin is slighth' indicated by a narrowing of the membrane in the region of the caudal peduncle. The pectoral fins are only rudimentary folds, but generally rays are discernible in them and in the inferior half of the hetero- cercal caudal fin (Fig. 3). In a specimen 0 o mm. long, taken July 18, difTer-. Fig. 3 Fig. 4 Fig. 3. Recently hatched lumpfish, mm. long, Cheticamp, June 29, 1917. Fig. 4. Young lumpfish, 8 mm. long, Magdalen Islands, July 13, 1917. entiation has advanced, and the two dorsals are outlined but joined with each other and with the caudal by strips of membrane. The anal and caudal are similarly connected, and the pectorals are assuming the usual form with better defined rays. In a larva, 8 mm. long, caught at the same time, the dorsals are nearly distinct, and the second is entirely separated from the caudal, while the anal shows a narrow connection with the latter (Fig. 4). Of two specimens mm. long, collected at the same time and place as the above, one showed the fins all distinct, with the lower and anterior portion of the pectorals quite dark; the other had a slight fringe between the dorsals, otherwise the fins were distinct and the caudal quite homocercal. In specimens of 9 mm. and upwards the fin equipment was complete. Mcintosh and Prince saw the character attained 26 days after exclusion from the egg (1890, Plate XV, Fig. 6). "By the I2th day the fish has increased considerably in bulk and measures mm. . the dorsal has now been transformed into two fins, the anal fin has 10 rays, and is joined to the caudeU by a strip of larval fin
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