250 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



the exterior through the funnel-shaped projection already described. That this 

 canal was a modified ambulacral groove was shown by the epithelial cells that lined 

 it, which were precisely similar to those that line the ordinary ambulacral grooves; 

 and further evidence in the same direction was afforded by the presence in its walls 

 of numbers of the deeply staining problematical bodies which are invariably seen 

 in sections through the ambulacral groove of this species. Beneath the epithelium 

 of the ambulacral grooves the nerve band can be recognized without difficulty 

 on most sections. The circular water vessel and radial water vessels were also present, 

 and from the former a considerable number of water tubes depended into the body 

 cavity. Water pores traversed the body wall in all the sections. But the skeletal 

 and axial nervous systems present in the normal disk and the central plexus were 

 entirely absent in the supernumerary one. 



Mr. Chad wick, adopting a suggestion from Prof. A. Milnes Marshall, supposed 

 this condition to have arisen from incomplete evisceration. 



Parasites. In addition to the parasites already given for Antedon mediterranea 

 (vol. 1, part 2, p. 684) Vogt and Yung (1887) mention an undescribed (?) copepod 

 which lives embedded in the tissues of specimens from Naples. This is probably 

 similar to the crustacean reported by P. H. Carpenter as found embedded in the disk 

 of Heliometra glacialis (vol. 1, part 2, p. 440). 



Localities. Mediterranean Sea [Lamarck, 1816, and many succeeding authors] 

 (13, C.M. ; L.M. ; P.M. ; H.M.) Type locality. 



Palma (Huelva), on the Bay of Cadiz [Aranda y Millan, 1908]. 



Near Gibraltar [von Graff, 1887]. 



Southern and eastern Spain. Malaga [Busch, 1849; MacAndrew, 1851] (2, 

 C.M.). Valencia [Aranda y Millan, 1908]. Machina [Aranda y Millan, 1908]. Bar- 

 celona [Aranda y Millan, 1908]. Blanes [Aranda y Millan, 1908]. Between Blanes 

 and San Feliu de Guixols; 94 meters [Pruvot, 1901]. North of Cape San Sebastian, 

 Province of Gerona; 142-116 meters [Pruvot, 1901]. Rosas [Lacaze-Duthiers, 1891]. 

 ?Minorca, Balearic Islands [Braun, 1886]. Majorca; Xauen stas. X 2, lat. 3931' N., 

 long. 844' E., X 8, lat. 3918' N., long. 95' E.; 55 meters [Rivera, 1934]. 



France. Coast of France (16, P.M.). Banyuls-sur-Mer [Pruvot, 1891, 1895, 

 1897; Aranda y Millau 1908; Bohn, 1911; Chalaux, 1935; Tortonese, 1956]. Roches 

 Cannalots, near Banyuls [Pruvot, 1895]. Port Vendres (just north of Banyuls) [Bau- 

 delot, 1872; Lacaze-Duthiers, 1891]. Cette [Leuckart, 1833; Koehler, 1894; A. H. 

 Clark, 1911] (8, M.C.Z., 242; P.M., one from P. Gervais). Cette, Frontignan jetty 

 [Lacaze-Duthiers, 1891]. Gulf of Lyon [Pruvot, 1897]. Marseille [Marion, 1878, 

 1883; Ludwig, 1879; Carus, 1884; A. H. Clark, 1911] (about 50, P.M., M. Deshayes, 

 1874). Bay of Marseille [A. H. Clark, 1913] (4, B.M.). Same, 60-80 meters [A. H. 

 Clark, 1913] (1, B.M.). West side, Gulf of Marseille; 3-36 meters; bottom, Zostera 

 and algae [Vayssiere, 1919]. Vicinity of Marseille; Bassin national, 0-2 meters; 

 at the head of the gulf, at Pharo, Madrague, Cape Janet, Mouripiano, Point Rouge 

 de Montredon, and Fond des Calanques; off Mejeau; south of Rion and Planier, 

 100-200 meters [Marion, 1883]. La Ciotat [Koehler, 1894]. Toulon [Dujardin, 

 1835, 1862; J. Barrois, 1888; Bonnet, 1928]. Hyeres [A. H. Clark, 1911] (1, P M.). 

 Nice (Nizza) [Risso, 1826, and many succeeding authors] (4, M.C.Z., 241; B.M.; 

 H.M.). Villefranche (Villafranca) [J. Barrois, 1888]. Same, 80 meters [Koehler 

 and Vaney, 1910]. 



