THE STONY CORALS OF THE PORTO RICAN WATERS. 
311 
around a calicinal center from 10 to 20 larger and as many smaller, but the larger are not so prominent 
as in A. elephantotus. The edges of this specimen are somewhat reflected, and that may have an 
influence on the appearance of the series. 
The most striking differences between it and the usual Agaricia agaricites are: The distance 
between collines in the latter is usually not so great, from 4.5 mm., or even less, to about 6 mm.; 
the summits of the collines in A. agaricites are usually more acute; and there are in A. agaricites , 
usually, not so many septa to the calice, about 13 large and as many small. The laminate corallum 
of A. agaricites is usually thicker. 
The specimen here discussed corresponds well to Milne-Ed wards & Haime’s characterization of 
Mycedium elephantotus, but it does not agree with the characterization by Pallas or the figure given 
by Ellis & Solander. 
From station 6090, off Culebra, Culebritas light-house. Bathymetric occurrence, 16 fathoms. 
Agaricia cailleti (Duchassaing & Michelotti). PL xx. 
1866. Mycedium cailleti , Duchassaing & Michelotti, Sup. M6m. Coral], Ant., p. 98 (of reprint). 
1874. Mycedium cailleti, Pourtales, 111. Cat. Mus. Comp. Zool., No. Till, p. 44, pi. ix, figs. 1, 2. 
Gregory 1 places this species in the synonymy of .1. elephantotus with the remark that it appears to 
be a deeper water variety of the typical A. elephantotus. The suites of specimens in the United States 
National Museum do not show intergradation; therefore I have kept the two forms separate. The 
distinguishing feature of A. cailleti is, the fronds are dissected and the divisions are crispate. The 
calices are unifacial. 
From station 6079, off St. Thomas, Sail Rock. There are seven good specimens of this species in 
the collection. Bathymetric occurrence, 20 to 23 fathoms. 
Genus BATHYACTIS Moseley, 1881. 2 
Bathyactis symmetrica (Pourtales). PI. i, figs. 7, 7 a, lb. 
1871. Fwnr/ia symmetrica, Pourtales, 111. Cat. Mus. Comp. Zool., No. iv, p. 46, pi. vn, figs. 5, 6. 
1881. Bathyactis symmetrica, Moseley, Deep Sea Corals, Challenger Reports, pp. 186-190, 2 figs, in text, pi. x, figs. 1-13 a. 
The diameter of an average-sized specimen is 8.8 mm. The base is imperforate, horizontal, with 
distinct but not very prominent costas corresponding to all septa. The six costae of the first cycle are 
slightly larger than those of the second, those of the third are still smaller, and those of the fourth 
are very small. The members of the first and second are prolonged to the center of the base. The 
wall is thin and is minutely granulated, even between the costas. The septa are imperforate in six 
distinct systems, and each system contains four cycles. The members of the first cycle are independent 
of the other septa and join directly to the columella. The members of the second cycle are also 
prolonged to the columella. The members of the third cycle fuse to the sides of those of the second 
quite near the columella, and those of the fourth fuse to the sides of the third a little nearer the wall 
than the columella. Thus there is a distinct group of septa between each pair of septa of the first cycle. 
The septal margins are spinosely dentate, the dentations somewhat flattened in a plane perpendicular to 
the septal plane. There may be granulations on the dentations. The fusion of the septa into groups 
is affected by synapticula, but the svnapticula are not confined to those places. They are fairly 
abundant. 
The calicular fossa is shallow. There is a small, weak, insignificant false columella. 
Five specimens were obtained by the Fish Commission, all in very good condition. 
It seems to me that Pourtales’ s Anthemipliyllia patera, whose systematic position has been much 
debated, probably is closely related to this species. 
From station 6069, Mayaguez Harbor. Bathymetric occurrence, 223 to 231 fathoms. 
1 Quart. Journ. Geol. Soc. London, vol. i.i, 1895, p. 281. 
2 After this paper had gone~to press it was discovered that Bathyactis symmetrica had been wrongly designated 
“ Diaseris” crispa. Page 311 was courteously reprinted by the Government Printing Office, but itwill be necessary for the 
reader- to make the following additional corrections: On p. 290, line 16, for Diaseris read Bathyactis; p. 290, line 17, for 
“ D laser is” crispa read Bathyactis symmetrica; p. 291, line 22 in table, for Diaseris crispa Pourtales read Bathyactis symmetrica 
( Pourtalis ); p. 319, under pi. r, after fig. 7, 7 a, 76; for Diaseris crispa Pourtales read Bathyactis symmetrica (Pourtales)', pi. I, in 
legend at bottom, for “Diaseris” read Bathyactis. 
