. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 7. Salinlfy (',,) profile to a depth of 2,000 m at 40'N, from Georges Bank to Portugal (October 2-22, 1957). From Fuglister (I960: 79), intermediate isohalines omitted. continental shelf, and Gulf Stream water, which has been carried west of the cur- rent's path" (Iselin, 1936: 11). The broad stratification of both tempera- ture and salinity in the water of the spawn- ing area, and their much more narrow and less orderly distribution in the water of the expatriation area, suggest that stability of environm
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 7. Salinlfy (',,) profile to a depth of 2,000 m at 40'N, from Georges Bank to Portugal (October 2-22, 1957). From Fuglister (I960: 79), intermediate isohalines omitted. continental shelf, and Gulf Stream water, which has been carried west of the cur- rent's path" (Iselin, 1936: 11). The broad stratification of both tempera- ture and salinity in the water of the spawn- ing area, and their much more narrow and less orderly distribution in the water of the expatriation area, suggest that stability of environment, within certain limits, may be a critical factor in the development of eggs. Lobianchia gemellari (Cocco) Expatriation from a subtropical environ- ment to the same expatriation area inhabited by L. dofleini should produce similar or more severe effects in that expatriate. L. gemellari (Fig. 8), a species closely related to L. dofleini, confirms this expectation. Reaching sexual maturity at about 40 mm, L. gemeUari is a somewhat larger fish than L. dofleini. It has a wide distribution, but is most abundant within a broad belt of warm water in the central North Atlantic (Fig. 9). Its .spawning area includes the Caribbean Sea and adjacent waters. Expatriation produces more drastic ef- fects in L. gemellari than in L. dofleini. Not only are gametes of both sexes pre- vented from growing normally, but even secondary sexual characters fail to develop fully. Expatriate males are generally indis- tinguishable from expatriate females, al- though a few specimens show traces of sexually dimorphic luminous tissue on the ,^: i^^>. ^:<' -= r r e. c^ " â : C r. «_ # ei. ft ., o o â...A,i*=^'^ sS=F- â *:^ â ^ Fcgure 8. Lobianchia gemellari (Cocco, 1838). Male, mm in standard Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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