906 MISS R. M. HARRISON AND MISS M. POOLE OX [Dec. 14, 



8ize is obviously a cliai'acter which must vary, and within certain 

 limits cannot be regarded as a distinction between species ; 

 ■shape must necessarily be determined to a great extent by local 

 external conditions, concerning which there is no information ; 

 the "epitheca"of the Burmese specimens may possibly have been 

 formed secondarily in self-preservation from the encrusting para- 

 sites which surround the lower portion of the corallites, and may 

 not be a true epitheca at all ; and the costte of these smaller and 

 probably younger individuals have not yet become so smooth and 

 worn as those of the larger Singapore specimen. 



The absolute symmetry of the internal structures, the characters 

 of the septa, and their entire edges passing into the costa?, suf- 

 ficiently establish its identity. 



Balanophyllia diffusa, sp. n. (Plate LXXXV. figs. 4« & h.) 

 Two examples, both broken from their attachment ; slightly- 

 curved, with slight circular swellings visible externally at various 

 jieights. Transverse outline of calice elliptical, lip of ealice not 

 thickened. 



Epitheca absent. Costse visible from the base upwards, but not 

 exsert, rather broad, and beset with low granulations; the junction 

 of the fifth to the fourth cycle of septa is, in some cases, accom- 

 panied by a corresponding junction of the costa2 externally. Septa 

 in six systems of four cycles, with an incomplete fifth cycle ; septa 

 of the first two cycles equal, somewhat exsert, edges smooth and 

 entire, slightly thickened peripherally, and inclined to become 

 fenestrated ; granulations tend to run in longitudinal and radial 

 rows ; septa of the lower cycles arranged in typical Balanophyllid 

 manner, edges very irregular and denticulate. Calicular fossa 

 shallow. Columella very highly developed, of a very delicate 

 spongy trabecular texture, and in some places extending between 

 the septa of the first two cycles up the septa of the third cycle to 

 the junction of the third to the fourth cycles. This encroachment 

 of the columella on the interseptal chambers is a character quite 

 distinct from any previously described species. 



Locality. — Station XXII. Hastings Harbour. Bottom : rock 

 and sand. Depth : 3-20 fathoms and shore. 



Genus Heteropsammia Milne-Edwards & Haime. 



Heteropsammia miohelini Milne-Edwards & Haime [35]. 



Numerous specimens, 322 in all, from different stations, varying 

 in size between small individuals 7 mm. in height, with calices 

 7x5 mm., to foi-ms twice the size, 15 mm. high, and calices 

 13x9 mm. The great majority have two calices, or else the 



