. Echinoidea. Sea urchins. Fig. 27. Part of the actinal aud abactinal side of the test of Sperosoma Grimaldi; 2-]^'". The genital and ocular piates are already separated by small anal jDlates, except the ocular plate III whicli is still in contact with the adjoining genital piates. In younger stages the apical piates will undoubtedly form a closed ring. The genital pores have not yet appeared; in a specimen of 40'"™ diameter from the Færoe Channel they have appeared, but the genital organs are still very small. The ocular piates are rather large, with a peculiar radiating striation i
. Echinoidea. Sea urchins. Fig. 27. Part of the actinal aud abactinal side of the test of Sperosoma Grimaldi; 2-]^'". The genital and ocular piates are already separated by small anal jDlates, except the ocular plate III whicli is still in contact with the adjoining genital piates. In younger stages the apical piates will undoubtedly form a closed ring. The genital pores have not yet appeared; in a specimen of 40'"™ diameter from the Færoe Channel they have appeared, but the genital organs are still very small. The ocular piates are rather large, with a peculiar radiating striation in the outer part. The anal area is closely covered by numerous small piates, those at the outer edge being somewhat larger; the inner ones are narrow and elongated, radially arranged rotmd the anal opening. — The gills have not yet aj^peared in this specimen, but in the specimen of 40""" thev are present, though still very small. This species was taken by the > Thor > at 62° 57'Lat. N. 19° 58' 957 M. in 1903 and at 61° 15' Lat. N. 9° 35' Long. W. 900 M. in 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 not perfectly resemble the original Mortensen, Th. (Theodor), 1868-1952. Copenhagen, Printed by Bianco Luno
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903
