. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 88 Bulletin Museum of Comparative Zoology, Vol. 136, No. 5. Figure 10. Temperature ( C) profile to a depth of 2,000 m at 16°N, from Guadeloupe to Frencfi West Africa (November 13-29, 1957). From Fuglisfer (I960: 31), intermediate isotfierms omitted. The testes of males from the reproductive area contained large numbers of sperm (Plate I, D). Expatriate females had ova- ries that contained extremely few oocytes, and even these were very small (Plate II, B) in comparison to the oocytes in the ovaries of females from the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 88 Bulletin Museum of Comparative Zoology, Vol. 136, No. 5. Figure 10. Temperature ( C) profile to a depth of 2,000 m at 16°N, from Guadeloupe to Frencfi West Africa (November 13-29, 1957). From Fuglisfer (I960: 31), intermediate isotfierms omitted. The testes of males from the reproductive area contained large numbers of sperm (Plate I, D). Expatriate females had ova- ries that contained extremely few oocytes, and even these were very small (Plate II, B) in comparison to the oocytes in the ovaries of females from the reproductive area. In expatriate ovaries the oocytes were similar in appearance to the smallest oocytes in a normal ovary. Expatriate testes did not contain mature sperm (Plate I, C). How- ever, both testes and ovaries of expatriate gemelhni showed a great number of cell divisions, in spite of the relatively minute size of these gonads and their superficial appearance of inactivity. Chromosomes were easily visible when stained with tolui- dine blue. Discussion. The process of expatriation for this species is swift and short. The Florida Current, which flows through the Straits of Florida at a maximum velocity of 160 cm per second ( miles per day) at the center of the current (Sverdrup ef aJ., 1942: 673-674), can easily initiate expatria- tion. The Gulf Stream, which is continuous with this current at Cape Ilaiteras, can speed the expatriates northward more than 60 miles per day (computed from xelocities given by Sverdrup ci al., 1942: 675). The differences in the expatriate environ- ment are more pronounced for L. gcmellari than lor L. doflcini. As the tempcMature profiles at 16"N and 40"N indicate, the waters within the spawning area are warmer, and their tem]-)eralures vary less with depth. For example, at 16°N the temperatures at 200 m range from 15°C to 20°C (Fig. 10), but at 40°N it is generally colder than 15° C at this depth. The horizontal temperatu
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