2S 



thick, quïte flat and disk-like, but has, radiating from its margin, six or eight short stout sharp 

 spokes like those of Odontocyathus . There is a large reticulate and encrusting columella, and the 

 septa, which are in four cycles of which the last is incomplete, appear to have been coarsely 

 serrated. There are no signs of pali. 



XVII. Desmophyllum Ehrenberg, E. & H., Duncan. 



Three species are found in the Siboga collection, one of them being very young and 

 therefore not specifically recognizable. Of the other two, one is the well known D. crista-galli, 

 and the other is a new species characterized by the obscurity of the lower cycles of septa which 

 are buried deep in the calicle. 



35. Desmophyllum crista-galli Edw. & H. 



Desmophyllum crista-galli Milne Edwards & Haime, Ann. Sci. Nat., Zool., (3), IX, 184S, p. 

 253, pi. VII, fig. 10 ; and Hist. Nat. Corall., II, p. 76: Saville Kent, Ann. Mag. Nat. 

 Hist, (4), VI, 1870, p. 459 (= D. Rusci Duch. & Mich.): Martin Duncan, Trans. Zool. 

 Soc, VIII, 1874, p. 321, pi. XLI, figs. 10 — 15 (= D. cumingi E. & H. and D. costatum E. 

 & H.): Pourtalès, Buil. Mus. Comp. Zool., V, 1878 — 79, p. 203 (= D. reflexum Duch. & 

 Mich. and D. Rusci Duch. & Mich.). 



Stat. 259. 5°29'.2S., i32°52'.5E. 487. m. 2 Ex., dead. 



Two dead specimens, one young, the other fullgrown, both with the exsert portions of 

 the septa somewhat broken, are certainly this species. 



Distribution. Atlantic, Mediterranean, Indo-Pacific, and Tertiary deposits of Italy. 



36. Desmophyllum sp. 



Stat. 95. 5°43'.5 S., ii9°40'. E. 522. M. 1 Ex. 



This is a very young specimen and cannot be identified with any certainty : it cannot 

 be referred to the next species with which it was associated in life. 



37. Desmophyllum alabastrum n. sp. Plate IV. Fig. 27, 2 7<?. 



Stat. 95. 5°43'.5N., ii9°4o'E. 522 m. 1 Ex. 

 Stat. 105. 6° 8' N., 121 19' E. 275 m. 1 Ex. 



Corallum elongate-goblet-shaped, nearly straight, little compressecl, with a stout cylin- 

 drical peduncle and an encrusting base. 



There are no costa;, but wavy transverse growth-lines are visible in places. 



Septa thin, finely granular, in six regular systems and four cycles ; but as the septa of 

 the two inferior cycles are very fine and narrow and occur only in the depths of the calice 

 and do not reach anywhere near the calicular margin, there appear to be, at first sight, only 

 two cycles of septa. The septa of the second cycle are narrow, but they extend up to the 

 calicular margin, though they are narrower there than they are in the clepths of the fossa. 



