124 ECHINOIDEA. II. 



Principal Literatnre: O. Fr. Muller: Zoologiæ Datiicæ Prodromus. 1776. (No. 2850).' Zoologia 

 Danica. 1788. p. 5. Tab. VI. — Leske: Additamenta ad J. Th. Kleinii Nat. Disp. Ech. 1788. p. 170 (235). 

 Tab. XLIII. Figs. 3 — 5. XLV. Fig. 5. — Philii^pi: Besclueibnng einiger nenen Echinodermen etc. Arch. 

 f. Natnrgesch. 1845. I. p. 350. — Gray: Catalogvie of the Recent Echinida in the Collection of the 

 Brit. Mus. I. Echinida Irregularia. 1855. p. 47. PI. III. i. — L. Agas.siz & Desor: Catalogue raisonné. 

 p. 112. — Sar.s: Norge.s Echinodermen p. 99. Middelhavets Littoralfauna. p. 118. — A. M. Norman: 

 Shetland Final Dredging Report. II. Crustacea Echinoderraata etc. Rep. Brit. Assoc. 1868. p. 315. 



— H. Bolau (82). p. 3. — A. Agassiz: Revision of Echini. p. 158, 565 (Numerous figures). — Loven: 

 Etudes sur les Écliinoidées. PI. XXXVI. On Pourtalesia. PI. X. Fig. 109. XII. 145. XVIII. 209—19. — 

 Koehler (217). p. 127. — Perrier: Recherches sur les Pédicellaires. p. 178. PI. VII. Fig.s. 4, 7. — Maz- 

 zetti: Catologo degli Echinidi fossili d. Coll. Mazzetti esistente nella R. Univ. di Modena. Mern. Acad. 

 Modena. (2) XI. 1896. p. 425. Fig. 6. — Grieg: Oversigt nordl. Norges Echinodermen p. 33. — Ludwig: 

 Echinodermen d. Mittelmeeres. p. 560. — Bell: Catalogue Briti-sh Kd\. p. 165. PI. XVI. 10. — Hoyle: 

 Revised List British Ech. p. 424. — Doderlein: Arkti.sche Seeigel. Fauna Arctica. IV. p. 383. Die 

 Echinoiden der deutscheu Tiefsee-Expedition. p. 260. Taf. XXXIII. 2. XLVIII. i. 



Non: A. Agassiz: iChallenger»-Echinoidea. p. 171. — Verrill: Results of the Explorations 

 .... «Albatross > in 1883. p. 551. 



vSeveral other less important literary references are found in the works quoted of Bell and 

 Ludwig, and in the « Revision of Echini?. 



Of tilis very well knowii and often described and figured species I have only a little to remark. 



The test is very often unequally developed, oiie side (always(?) the right) being somewhat 

 prominent in front of the other (PL II. Fig. 8); the specimens from the Faroe Islands especially show 

 this feature very distinctly and almost constantly, but I have seen it just as distinct in .specimens 

 from the Kattegat and from the Mediterranean. Even in a specimen only 16""" in lengtli this obliquity 

 is already distinctly seen. — The largest specimen I have seen (from Roscoff) is ns""™ long, 117"™ 

 broad (60""" high); tliough differing from the usual form in being broader thau long it undoubtedly 

 belongs to this species. Some specimens from the Doggerbank show a remarkable deforniity, the 

 actinal plastron being quite hollow. (Similar deformities also occur in Bn'ssopsis lyrifera and Ec/ihio- 

 cardmvi flavescens from the North Sea). 



The pedicellariæ are rather well known. Perrier (loc. cit.) and Agassiz (Rev. of Ech. PL XXVI- 

 Figs. 24-27) have described and figured the two forms of tridentate pedicellariæ. Another form, the 

 triphyllous pedicellariæ, has been described, but not figured, by Koehler (loc. cit). The most impor- 

 tant contribution, however, is given by Doderlein (Oi). cit.), who gives good photographic figures of 

 the different forms of tridentate and of the triphyllous pedicellariæ. My figures of tliese forms were 

 made a long time before Professor Doderlein 's work was published; as they show several niinute 

 details more distinctly thau Doderlein' s figures, I think it not superfluous to publish some of thera. 



— Besides these forms of pedicellariæ I have also found ophicephalous ones, whereas globiferous pedi- 

 cellariæ have not been found. Doderlein (Echinoiden d. deutsch. Tiefsee-Exp. p. 262) has found a 



■ Agassiz puts a question mark at this quotation ; there cannot, however. be the sUghtest doubt that this species 

 is really ineant, since Miiller iii »Zoologia Danica« himseU refers to this place, and the diagnosis is the same. 



