. a b c a b c Fig. 5. Fig. 6. Fig. 7. Fig. 5. Hooks from mature specimens of 5. gazellae and 5. lyra, traced from photomicrographs, (a) S. gazellae 85 mm. long at stage III; first hook, (b) S. gazellae 62 mm. at stage III; first hook, (c) S. lyra 31 mm. at stage III; first hook. Fig. 6. Mature specimens showing relative length at maturity and the shape and position of the fins and seminal vesicles. (a) S. lyra at stage III. (b) S. gazellae at stage III. (c) S. gazellae at stage IV. Fig. 7. 5. lyra from its left side, showing the course of part of one of the ventral nerve co
. a b c a b c Fig. 5. Fig. 6. Fig. 7. Fig. 5. Hooks from mature specimens of 5. gazellae and 5. lyra, traced from photomicrographs, (a) S. gazellae 85 mm. long at stage III; first hook, (b) S. gazellae 62 mm. at stage III; first hook, (c) S. lyra 31 mm. at stage III; first hook. Fig. 6. Mature specimens showing relative length at maturity and the shape and position of the fins and seminal vesicles. (a) S. lyra at stage III. (b) S. gazellae at stage III. (c) S. gazellae at stage IV. Fig. 7. 5. lyra from its left side, showing the course of part of one of the ventral nerve cords across the lateral field between the anterior and posterior fins. There are also several other points with regard to the position and shape of the fins. The appearance of the junction between the anterior and posterior fins has been discussed by Tokioka (1939) and Ghirardelli (1950); it is of no value in distinguishing S. lyra "gazellae "-type from S. gazellae. The appearance of the posterior end of the anterior fin is much more sharply curved in S. lyra than in S. gazellae (Fig. 6), but this is a difficult feature to see, and the delicate fins are often damaged. In S. lyra "lyra"-type the lateral fields present a swollen appearance. Tokioka (1940) gives a good
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