2 g ECHINOIDEA. II. 



Suborder Clypeastroidea. 

 Fam. Fibulariidae. 



18. Echinocyamus pusillus (O. F. Miiller). 



PI. XII. Figs. 4, 6, 9, 1820. 22, 23, 26, 27, 2931. 

 Principal synonyms: Echinocyamus angulosus Leske. 

 Fibularia tarentina Lamarck. 

 Echinocyamus parthenopceus Costa. 



speciosus Costa. 



Principal literature: O. F. Miiller: Zoologise Danicte Prodromus. 1776. p. 236. Zoologia Danica. 

 III. 1789. p. 1 8. Tab. XCI. Figs. 5 6. - - Leske: Additamenta. 1778. p. 215. -- Lamarck: Animanx 

 sans vertebres. 1816. p. 17. - Forbes: British Starfishes. 1841. p. 175. Monograph Echinoderms Brit. 

 Tertiaries. 1852. p. 10. PI. I. - L. Agassiz: Monographies d'Echinodermes. II. Des Scutelles. 1841. 

 p. 128, 130. PI. XXVII. Figs, i 8, 14 18. -- Philippi: Beschr. einiger neuen Echinodermen etc. Arch, 

 f. Naturgesch. 1845. P- 35^- ~~ Agassiz & Desor: Catalogue raisonne des Echinod. 1847. P- 82. - 

 Diiben & Koren: Skandinaviens Echinod. 1844. p. 279. - - M. Sars: Norges Echinodermer. p. 95. 

 Middelhavets Littoralfauna. p. 116. - - Heller: Zoophyten u. Echinod. d. Adriat. Meeres. 1868. p. 66. 



- Costa: Monografia degli Echinocyami viventi e fossili delle Provincie Napolitane. Atti R. Acad. 

 sci. fis. e matem. Napoli. III. 1867. (No. 14) p. 4. PI. I. i 2. -- A. Agassiz: Revision of Echini, p. m, 

 304. PI. XI. e. 3. -- Loven: Etudes stir les Ech. PI. XVI. 139. PL XLIV; Echinologica. PI. IX. 102-9. 

 XI. 141, 145. - - Cuenot: Etudes morphologiqnes sur les Echinodermes. Arch, de Biologic. XL 1891. 

 PI. XXIV. Figs. 9, 16. - - Theel: Development of Echinocyamus pusillus. 1892. Koehler: Echi- 

 nides et Ophiures . . . de 1'Hirondelle. (229) J . 1898. p. 24. -- Ludwig: Echinod. d. Mittelmeeres. p. 559 



- Bell: Catalogue Brit. Echinoderms. p. 160. PI. XVI. 8 9. -- Hoyle: Revised List Brit. Echinoidea 

 p. 419. -- Airaghi: 2 Echinidi Terziari del Piemonte e della Liguria. Palseontogr. ital. VII. 1901. p. 178. 

 PI. XXII. - - Grieg: Oversigt over det nordlige Norges Echinodermer. 1902. p. 32. -- Doderlein: 

 Archtische Seeigel. Fauna Arctica. 1905. p. 382. Die Echinoiden cler deutschen Tiefsee-Expedition. 

 1906. p. 234. 



Non: A. Agassiz: Revision of Echini. PI. XIII. i 8. :< Blake* -Echinoidea. p. 40. Challenger - 

 Echinoidea. p. 118. Bernard: (78)'. 



For other less important literature reference may be made to -Revision of Echini;, Ludwig: 

 Echinod. d. Mittelm., Bell: Catalogue Brit. Ech. and Hoyle: Rev. List Brit. Ech. 



Though this species has been so often described I must make some additional remarks on it, 

 which I think will not prove to be superfluous. 



Agassiz has made the important observation that small pores occur along the horizontal 

 sutures of the ambulacra as in other Clypeastrids 3; as, however, his description and figures are not 



1 The number refers to the bibliographical list in Part I. 



2 Cited after Zoological Record. 1901. Not seen bv me. 



3 Joh. Miiller: Ban der Echinodermen. Abhandl. d. Acad. Berlin. iSjv 



