28 ECHINOIDEA. II. 



Suborder Clypeastroidea. 

 Fam. Fibulariidæ. 



i8. Echinocyamus pusillus (O. F. Miiller). 



PI. XII. Kigs. 4, 6, 9, iS — 20. 22, 23, 26, 27, 29—31. 

 Principal .synonNin.s: Echinocyaiiius aiigulosns Leske. 

 Fibidari« tdrciitiua Laniarck. 

 Echinnryaiiiiis piirthciiopcnis Costa. 

 — spi'ciosiis Costa. 



Principal literatnre: O. F. AI ii 11 er: Zoologiæ Danicæ Prodrouuus. 1776. p. 236. Zoologia Danica. 

 III. 1789. p. 18. Tab. XCI. F'ig.s. 5 — 6. — Leske: Additanienta. 1778. p. 215. — Lamarck: Animaiix 

 sans vertébres. 1816. p. 17. — Forlses: British Starfishes. 1841. p. 175. Monograpli Echinoderms Brit. 

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

 p. 128, 130. PI. XXVII. Figs. 1 — 8, 14—18. — Philippi: Beschr. einiger neuen Echinodermen etc. Arch. 

 f. Naturgesch. 1845. P- jS^- — Agassiz & Desor: Catalogue raisonné des Échinod. 1847. p. 82. — 

 Diiben & Koren: Skandinaviens P^chinod. 1844. p. 279. — M. Sars: Norges Echinodernier. p. 95. 

 Middelhavets Littoralfauna. p. 116. — Heller: Zoophyten n. Echinod. d. Adriat. Meeres. 1868. p. 66. 



— Costa: Monografia degli Echinocyami viven ti e fossili delle Provincie Napolitane. Atti R. Acad. 

 sci. fis. e niateni. Napoli. III. 1867. (No. 14) p. 4. PLI. 1 — 2. — A. Agassiz: Revision of Echini. p. iii, 

 304. PL XI. e. 3. — Loven: Etndes snr les Ech. PL X\'I. 139. PL XLIV; Echinologica. PL IX. 102—9. 

 XI. 141, 145. — Cnénot: Etudes niorphologiques sur les Échinodermes. Arch. de Biologie. XI. 1891. 

 PL XXIV. Figs. 9, 16. — Théel: Developnient of Echinocyamus pusillu.s. 1892. — Koehler: Échi- 

 nides et Ophiures ... de l'Hirondelle. (229)'. 1898. p. 24. — Ludwig: Echinod. d. Mittelmeeres. p. 559 



— Bell: Catalogue Brit. Echinoderms. p. 160. PL XVI. 8 — 9. — Hoyle: Revised List Brit. Echinoidea 

 p. 419. — Airaghi:' Echinidi Terziari del Piemonte e della Liguria. Palæontogr. ital. VII. 1901. p. 178. 

 PL XXII. — Grieg: Oversigt o\'er det nordlige Norges Echinodernier. 1902. p- 32. — Doderlein: 

 Archtische Seeigel. Fauna .\rctica. 1905. p. 382. Die Echiuoiden der deutschen Tiefsee-Expedition. 

 1906. p. 234. 



Non: A. Agassiz: Revi.sion of Echini. PL XIII. i — S. Blake -p;chinoidea. p. 40. Challenger - 

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



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

 Echinod. d. Alittelm., 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 aloug the horizontal 



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



' The nuniber refers to the bibUographical h.st in Part I. 



- Cited after Zoological Record. 1901. — Not seen by me. 



j Joh. Muller: Bau der Echiuodenneii. .\l)handl. d. .\cad. Berlin. 1S53. 



