Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . rmed into braces or stays. Is, bra, bre, in a more firm attachment of the gill arches. The extrabranchials, sbr, are highly developed; originally they were branchial rays, I and they do not closely correspond with the extrabranchials seen, on Plate 51, fig. 2, or on Plate 62, j exbr and sbr, in the shark. The stays Is, bra, bre originated as noted under Plate 74 for those in Rhinop-tera. The second ray from the outer stay is lengthened, wider outward, and has a slender curvedextremity; it also serves as a brace
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . rmed into braces or stays. Is, bra, bre, in a more firm attachment of the gill arches. The extrabranchials, sbr, are highly developed; originally they were branchial rays, I and they do not closely correspond with the extrabranchials seen, on Plate 51, fig. 2, or on Plate 62, j exbr and sbr, in the shark. The stays Is, bra, bre originated as noted under Plate 74 for those in Rhinop-tera. The second ray from the outer stay is lengthened, wider outward, and has a slender curvedextremity; it also serves as a brace. Nearly all of the rays on the ceratohyals, chi/, are segmented andmore or less changed in form. The long strips of cartilage, ews, first appearing as small lumps and later I fusing, upon the bends in the gill lamellae, parallel with the gill arches, are adventitious and are firstnoted in Myliobatidae, Plate 73; they are named epiiropeal cartilages, the upper supratropeal, thelower sublropeal. The opercular cartilages, op attain their maximum development in this family. so. o> :oo N oO ^^^\, s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
