632 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



P! consists of 8 to 9 longish segments and measures about 4.5 to 5 mm. P 2 usually 

 has 8 segments and is about 3.5 mm. long; likewise P 3 . The first genital pinnule is 

 P 8 or P 7 ; they are of about 9 segments and about 5 mm. long. The third and fourth 

 segments of the genital pinnules are slightly and almost symmetrically expanded but 

 still longer than broad. The specimen is a male. 



The distal pinnules have side and cover plates, two or three pairs to each segment, 

 along the ambulacra. They are figured by Dr. John (1938, fig. 13c). The side plates 

 are rods with branching and reticulate ends. The cover plates are bush-shaped, with 

 a short stem. Some of the tentacles contain knobbed spicules. 



Locality. Challenger station 320; off Monte Video, Uruguay (lat. 3717' S., long. 

 5352' W.); 1097 meters; temperature 2.89 C.; green sand; February 14, 1876 [P. H. 

 Carpenter, 1888; A. H. Clark, 1913; John, 1938] (1, B.M.). 



ISOMETRA VIVIPARA Mortensen * 



FIGURE 36 

 [See also vol. 1, pt. 2, pi. 38, figs. 1238-1240, pi. 49, figs. 1328-1331] 



Anledon hirsuta (not of P. H. Carpenter, 1888) ANDEBSSON, Zool. Anz., vol. 27, 1904, No. 19, p. 662 

 (care of the brood); Wiss. Ergebn. schwed. Sudpolar-Exped. 1901-1903, vol. 5, Lief 1, 1904, 

 pp. 1-7 (structure and anatomy of ovaries and marsupium; care of the brood; Burdwood Bank; 

 135-150 meters), pis. 1, 2; in Gregory, Geogr. Journ., vol. 32, No. 1, 1908, p. 42 (care of the brood). 



Feather Stars WILTON, PIKIE AND BROWN, Rep. Sci. Res. S.Y. Scotia, vol. 4, Zool., 1908, p. 21. 



Crinoids (part) WILTON, PIRIE AND BROWN, Rep. Sci. Res. S.Y. Scotia, vol. 4, Zool., 1908, p. 61. 



Isornetra sp. A. H. CLARK, Die Crinoiden der Antarktis, 1915, p. 106 (collected by the Antarctic). 



llsomelra angustipinna (not Antedon angustipinna of P. H. Carpenter) A. H. CLARK, Die Crinoiden 

 der Antarktis, 1915, p. 146 (identification of Andersson's specimens). 



Isometra vivipara MORTENSEN, Vid. Medd. Nat. Foren. K0benhavn, vol. 68, 1917, p. 208 (charac- 

 ters); Wiss. Ergebn. schwed. Sudpolar-Exped. 1901-1903, vol. 6, Lief. 8, 1918, pp. 10-15, figs. 

 6-13, pi. 1, figs. 6-10, pi. 2, figs. 5-7 (detailed account); Studies in the development of Crinoids, 

 1920, pp. 13, 16 (comparison with Tropiometra development), p. 29 (development of brachials 

 and pinnulars), pp. 31-48 (embryology and development), pp. 60 and following (care of brood; 

 discussion of the embryology), pis. 14-23 (except pi. 21, fig. 7); Vid. Medd. Nat. Foren. K0ben- 

 havn, vol. 71, 1920, pp. 155, 156. A. H. CLARK, Smithsonian Misc. Coll., vol. 72, No. 7, 1921, 

 p. 23 (cannibalism); The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 42 (range). 

 GISLN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 28, footnote 1, p. 44 (articulations), pp. 74, 82 

 (articulations), p. 194, p. 271 (cannibalism); figs. 85-86, p. 81; fig. 112, p. 93; fig. 188, p. 98; 

 figs. 289-292, p. 217. KOEHLER, Les e'chinodermes des mers d'Europe, vol. 1, 1924, p. 35 (brood- 

 ing of young). MORTENSEN and LIEBERKIND, Die Tierwelt der Nord- und Ostsee, vol. 12, 

 1928, p. viii. 86 (cannibalism). TORTONESE, Natura, Milano, vol. 24, 1933, p. 165. MORTEN- 

 SEN, Discovery Reports, vol. 12, 1936, p. 208 (cannibalism of young). A. H. CLARK, Sci. Rep. 

 Australasian Antarctic Exped. 1911-14, ser. C, vol. 8, pt. 4, 1937, p. 5 (listed), p. 8 (in key). 

 JOHN, Proc. Linn. Soc. London, sess. 149, pt. 2, 1937, p. 86 (Antarctic; also Burdwood Bank 

 and Patagonian coast), p. 87 (brood protection), p. 88; Discovery Reports, vol. 18, 1938, p. 123 

 (listed), p. 124 (pentacrinoid larvae found), pp. 125, 126, 128 (care of the brood), pp. 129, 131, 

 p. 132 (in key), pp. 178-181 (Discovery stations; distribution; descriptive remarks), p. 183 (com- 

 parison with 7. fiavescens), pp. 185, 186, 187 (comparison with 7. graminea), pp. 191, 192 (com- 

 parison with 7. hordea); fig. 15, p. 180; pi. 5, figs. 1, 2. VANEY, Sci. Res. Voy. S.Y. Scotia, vol. 

 59, pt. 3, 1939, p. 661. DAWYDOFF in Grasse, Traite de Zoologie, vol. 11, 1948, p. 321. HYMAN, 

 The invertebrates, vol. 4, Echinodermata, 1955, fig. 28F (pinnule with marsupium), p. 75 (sperm 

 present in genital tube of ovary), fig. 35 (development of the arms), p. 87 (embryology). 



*See also scatter diagram (p. 835) and Addenda (p. S37) under 196.3. 



