Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . E. N. FISCHER. OEL HCLiOTVfE CO. PLATE 71. I 1I PLATE 71. I IIDASYBATIDAE. Fig. 1-2. Dasybatus guttatus. M. C. Z. 639 (Page 391). Fig. 3. Dasybatus C. Z. 23 (Page 398). Fig. 4-5. Taenidra lymma. M. C. Z. 620 (Page 399). i 1, 3, 4. Dorsal view. ^ 2, 5. Ventral view. j Rigidity of the disk around tlie head and tlie branchial chamber is secured by the elongation and firmness of the propterygial segment of the pectoral ba,se. The copula, hbr, unlike that of the Raiidae,is segmented; anteriorly, in the
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . E. N. FISCHER. OEL HCLiOTVfE CO. PLATE 71. I 1I PLATE 71. I IIDASYBATIDAE. Fig. 1-2. Dasybatus guttatus. M. C. Z. 639 (Page 391). Fig. 3. Dasybatus C. Z. 23 (Page 398). Fig. 4-5. Taenidra lymma. M. C. Z. 620 (Page 399). i 1, 3, 4. Dorsal view. ^ 2, 5. Ventral view. j Rigidity of the disk around tlie head and tlie branchial chamber is secured by the elongation and firmness of the propterygial segment of the pectoral ba,se. The copula, hbr, unlike that of the Raiidae,is segmented; anteriorly, in the portion, it broadens toward the suspensorium, hyomandi-bular, hin. The ceratobranchials are more or less consolidatefl and enlarged, as also the basihyals. Thebranchial ray, or rays, at the outer ends of the ceratohyals and ceratobranchials are attached to the basesof the pectoral at their outer ends but are not modified. Mem. Mus. Comp. Zool., Vol. 36. Plagiostomes. Plate E. n flSCMER, DEL MELIOTVPt CO. PLATE 72. PLATE 72. Fig. 1-2. Ptehoplatea altavela. (Page 415). Except in what is more directly affected by the broadening of the body and the pectorals this genusexhibits no great departure from the other Dasybatidae. The copula is segmented, the propterygialsegment of the pectoral base is strong and elongate and reaches slightly beyond the antorbital, theceratobrancliials, cbr, are fused at their inward ends, and the basihyals form a large broad shield-likeplate. The shoulder girdle has been mollified in several particulars; the pectoral bar, /ict, has widenedand the scapular bracts to the pro-nie-so-and metapterygia have elongated, though the .scapula, sc, fromwhich they extend outward, is comparatively little changed. Mem. Mus. Comp. Zool., Vol. 36. Plagiostomes. Plate 72.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
