39 



XXV. Cycloseris Edw. & 11. 

 Stat. ioo. 6°ll'N., i2o°37'.5E. 450 m. 1 Ex., dead and worn. 



óo. The single corallum dredged is dead and much ground down, so that its specific 

 identity is lost. 



MADREPORARIA PERFORATA. 



V. Family Eupsammid.e Edw. & H , Duncan. 



Five genera, including subgenera, are represented in the collection. 



XXVI. Stephanophyllia Michelin, Edw. & H. Duncan. 



Both of the Challenger species were dredged by the Siboga, along with a new and 

 nearly-related species. 



Synopsis of the Siboga species of Stephanophyllia. 



I. The columella is a spongy mass: the primary septa are quite independent . 1. 5. formosissima. 

 II. The columella is an elongate vertical lamella : 



I. The primary septa are in contact, near the middle, with the 



deltas on either side 2. S. complicata. 



II. The primary septa are independent 3-5. fungulus. 



6 1 . Stephanophyllia formosissima Moseley. 



Stephanophyllia formosissima Moseley. Proc. Roy. Soc. 1876, p. 561, and Challenger Deep 

 Sea Aladreporaria, p. 201, pi. IV, fig. 11, pi. XIII, figs. 6, 7, pi. XVI, figs. 8, 9. 



Stat. 95. 5°43'.5N., U9°4o' E. 522 m. 2 Ex. (small and dead). 



Stat. 95. ? n ,, „2 Ex. (large, living). 



Stat. 256. 5°26'.6S., i32°32'.5E. 397 m. 1 Ex. (small, dead). 



Stat. 302. io°27'.9S., I23°28'.7E. 216 m. 1 Ex. 



The Siboga specimens were obtained in much the same place as those of the Challenger, 

 namely off the Philippines and off the Kei Islands, with the additional locality further south 

 denoted by Station 302. 



61a. Stephanophyllia formosissima Moseley, var. 



Stat. 45. 7 24' S., ii8°is'.2E. 794 m. 1 Ex. 

 Stat. 2S4. 8°43'.iS., i2fi6.jE. 82S m. 1 Ex. 



Though at first sight these two specimens seem to be something obviously distinct, a 

 detailed comparison reveals nothing of specific value. 



They differ from the typical form in the height and texture of the septa. The septa, 



