19 



Corallum white : the soft parts, in spirit, are also whitish. 



In the type specimen the greatest height of the coralhim is 28 millim., the major dia- 

 meter of the cahcle 19.5 milHm., and the minor diameter of the caHcle 15 millim. 



XI. Deltocyathus Edw. & H., Duncan. 

 Four species of this genus are represented in the collection, including a magnificent 

 specimen oi D. iiiagnifiais. 



Synopsis of the Siboga species of Deltocyathus. 



I. Septa in six systems and four complete cycles : 



1. Corallum discoid or saucer-shaped: conspicuous pali before the septa 



of the first three cycles \. D. italicus. 



2. Corallum onion-shaped, the pali before the secondary septa alone are 



distinct 2. D. lens. 



II. Septa in six systems and five complete cycles: 



1. Corallum discoid, dense septa echinulate 3- -O. iiiagnificns. 



2. Corallum saucer-shaped, thin and fragile: septa non-echinulate. . . . 4. /?. fragilis. 



20. DcltocyatJnis italictis (Michelotti) Edw. & H. 



Deltocyathus italicus Milne Edwards et Haime. Annales des Sciences Naturelles, 3 ser., Zool. 

 IX, 1848, p. 326, pi. X. fig. II, and Hist. Nat. des Coralliaires II, 56: Pourtales, Bulletin 

 of the Museum of Comp. Zool. Vol. VI, 1879 — 80, p. loi, pi. I, figs, i- 8. Moseley, 

 Challenger Deep-Sea Madreporaria, p. 145. Jourdan, Hirondelle Zoanthaires (Monaco, 1895) 

 p. 16, pi. I. figs. \\a — d. 



Deltocyathus agassizii Pourtales, Bull. Mus. Comp. Zool. Vol. I, 1863 — 69, p. 113, and 

 Vol. V, 1878—79, p. 200 ; and Illustrated Catalogue of the Museum of Comp. Zool. N^ IV, 

 1871, p. 15, pi. II. figs. 1—5 and pi. V. figs. 9— 10, and W VIII, 1874, p. 35, pi. VI. 

 fig. II. Lindstrom, K. Svenska Vetenskaps-Akad. Handl. Bd. XIV, 1876, N'^ 6, p. 10, 

 pi. I & II, fig. 13—20. 



Stat. 45. 7° 24' S., ii8°i5'.2E. 794 m. i Ex. 



Stat. 95. s°43'.5N., 119° 40' E. 522 m. i Ex. 



Stat. 100. 6° 11'. N., 1 20° 37'. 5 E. 450 m. 2 Ex. 



Stat. 251. 5°28'.4S., 132° o'.2 E. 204 m. i Ex. 



I do not from the description and figures appreciate the distinction between this species 

 and D. ornattts Gardiner. (On the Solitary Corals collected by Dr. A. Willey : Willey's 

 Zoological Results part. II, p. 163). 



DistribjitioH. Atlantic (West Indies and neighbouring coast of America, Bermuda, Azores 

 and E. Atlantic), East Indian Archipelago ("Challenger" and "Siboga"), South Pacific. Miocene 

 of Northern Italy. 



21. Deltoeyatlnts lens n. sp. Plate II. Pig. 16, i6a. 



Stat. 59. io°22'.7S., i23°i6'.5E. 390 m. 2 Ex. 



Stat. 95. 5°43'.5 N., ii9°4o' E. 522 m. 3 Ex., dead. 



Stat. 256. 5°26'.6S., 1 32° 32'. 5 E. 397 m. i Ex. 



Stat. 275. 4°52'.5S., 128° 37' E. 4914 m. 3 Ex. 



Corallum onion-shaped or lentiform. Costce all equal and all distinct from caKcle to 

 base, sharply salient and elegantly serrulate. 



