REPORT ON THE REEF-CORALS. 79 
4, Mussa aspera, Milne-Edwards and Haiwe. 
Mussa aspera, Milne-Edwards and Haime, Cor., ii. p. 332. 
The specimen of this species is poorly grown, and by no means presents the typical 
structure of the species; itis smaller throughout, more vesicular and less thickened. A 
good figure of the species is given by Milne-Edwards and Haime.* 
Locality.—Somerset, Cape York, 5 fathoms. 
5. Mussa brueggemanni, nu. sp. (Pl. IL. figs. 6-65). 
Corallum forming large hemispherical clumps in which the calicles are either isolated 
and distinctly separate throughout a greater or less portion of their length, or remain 
united forming rather short sinuous series. The width of the calicinal series is very 
variable, from 10 mm. to 30 mm., the edge of the calicles being often expanded ; the 
width of the interspaces between the series about 12 mm., the diameter of the isolated 
calicles often about 30 mm. or more, and the depth about 15 mm., sometimes less. The 
cost are often quite distinct, and marked with small spines, which are larger and more 
numerous near the margin of the calicles, but frequently the outer wall is only obscurely 
striated or quite smooth. Jive cycles of septa are present, easily determined im the 
isolated calicles, a sixth cycle being quite rudimentary. The septa are thus usually close 
and crowded ; the chief septa are thickened but never stout, very prominent above the 
edge of the wall, and divided to the very centre into numerous, long, sharp, slightly 
curved strong teeth, which are thicker and shorter above ; the smaller septa are very thin 
and are furnished with long, narrow, sharp teeth. The columella is generally well 
developed and trabeculate. Endotheca low down in the cup. In transverse section the 
septa and dissepiments are seen to be very close and thin, and the wall but shghtly 
thickened. 
The species is close to the Mussa cytherea and has much of the appearance of a very 
attenuated form of Mussa sinuosa. One small specimen and several fragments were 
obtained, the fragments being taken from one large specimen which measured more than 
5 feet in diameter. 
The very closely crowded septa, which are divided throughout even to the very centre 
into long, sharp, and slender teeth, those towards the outer edge being somewhat enlarged, 
give a very characteristic appearance to the species and will readily serve to mark it. 
The species is named after the late Dr. Briiggemann who first recognised its specific 
distinctness, but did not describe it. 
Locality.—Amboina. 
1 Ann. d. Sct. Nat., ser. 3, vol. x. pl. viii. fig. 4. 
