42 



XXVIII. Subgenus Thecopsammia Pourtalès. 

 Thecopsammia Pourtalès. Illust. Cat. Mus. Comp. Zool., N" IV, 1871, p. 43. 

 The collection contains two species referable to this genus. 



Synopsis of the Siboga Dcep-Sea species of Thecopsammia. 



I. Corallum very elongate, fistulous or vermiform, of nearly equal diameter throughout 



its length: columella small and reticulate \. T. fistula. 



II. Corallum expanding gradually from pedicle to calicle: Columella large and 



compact, made up of twisted lamellae, 2. T. gemina. 



67. Balanophyllia (Thecopsammia) gemma Moseley. 



Thecopsammia gemma Moseley. Challenger Deep Sea Madreporaria, p. 195, pi. XV, fïgs. 

 8, 8a— b. 



Stat. 297. io°39'S., i23°4o'E. 520 m. 1 Ex. 

 Distribution. Sulu-Celebes Sea, Sea south of Timor. 



6S. Balanophyllia (Thecopsammia) fistula n. sp. Plate V. Fig. 36, 36a. 



Stat. 105. 6° 8' N., 121 19' E. 275 m. 2 Ex. 

 Stat. 107. 6°i'.5N., i2i°28'E. 270 m. 1 Ex. 



Corallum greatly elongate, vermiform, subcylindrical and of nearly equal diameter throughout, 

 covered with a thin epitheca beneath which it is granular and very indistinctly costate. 



Calicular orifice broadly elliptical, with the lip thickened. Septa not exsert, in six systems 

 and four complete cycles, thick and spongy at the junction with the calicular margin, thin and 

 finely granular or spicular elsewhere. Those of the first cycle are much the largest ; those of 

 the second cycle are large, but do not quite reach the columella; those of the fourth cycle 

 are a good deal larger than those of the third, towards which they curve and in front of 

 which they meet. 



Columella elliptical, prominent, loosely spongy, fairly deep-seated. 

 Length of broken corallum 95.00 millim. 

 Major diameter of calicle 7.00 „ 

 Minor „ „ „ 6.00 



What look like secondary corallites, produced by budding, may be present on the dead 

 part of the corallum, far from the calicle; but they are separate individuals which have simply 

 settled there, as is shown by the fact that when they are detached the wall of the original 

 o trallum is found intact. 



