86 CALIFORNIA ACADEMY OF SCIENCES. 



CCELENTERATA/ 



Class ANTHOZOA.' 



Family I. TURBINOLID^. 



Genus Caryophyllia Lamarck. 



I. Caryophyllia arnoldi Vaughan. 



Plate III, Figs. 4 and 4«. 



Caryophyllia arnoldi Vaughan, Proc. U. S. Nat. Mus., Vol. XXII, 1900, No. 1194, pp. 199, 200, 

 PI. XVI, figs. I, 2. 



The following is the original description: — 



Form of corallum slightly deformed inverted cone-shaped. A basal scar present, but the coral 

 in its later stages was evidently unattached. Base subacute, calice nearly circular in transverse outline. 



Costae very distinct, low, broad, rounded, or flattish, show no ornamentation, but the speci- 

 men is worn, and they were probably minutely granulated. There is a tendency to alternation in 

 size, which is pronounced near the base. There is no observable epitheca. The wall is stout, solid, 

 a. distinct pseudotheca. The costee are wide and the intercostal spaces very narrow, simply furrows, 

 and the septa are thickened at the wall. The upper margins of the septa project very slightly above 

 the upper limit of the corallum wall. There are four complete cycles of septa (forty-eight in all), 

 arranged as follows: Twelve large thick septa, joined to the columella by very thick pali. The 

 width of each palus is equal to the width of its corresponding septum: the upper margins of the 

 palus stand about 2 mm. above the upper surface of the columella, and fully i mm. above the notch 

 dividing the palus from the septal lamina. The width of the pali is about 2.5 mm. From the upper 

 margin of the septum to the notch between septum and palus is about 4.5 mm., may be slightly 

 greater. The inner ends of the pali are fused solidly around the columella and to it. On the septal 

 faces are small granulations arranged in curves parallel to the upper septal margins. On the faces 

 of the pali are granulated or serrated crests arranged in curves parallel to the upper margins of the 

 pali. Between each pair of these larger septa are three smaller (one of the third cycle and two of 

 the fourth). The members of the third cycle are narrow above the level of the upper termination 

 of the columella; below this they widen, but do not seem ever to reach the columella. The members 

 of the fourth cycle are narrow, and thin except where they arch over the walls. The columella is 

 essential, is composed of several pieces, trabeculse, which are firmly soldered one to another and to 

 the inner terminations of the pali by solid basal calcareous deposit. From the upper margins of the 

 septa to the upper termination of the columella is about 6.5 mm. ; that is, the calicular fossa is about 

 6.5 mm. deep. The greater diameter of the upper termination is 5 mm., the lesser 3.5 mm., above 

 whose level, as may be gathered from what preceded, the pali form a regular crown. 



Dimensions. — Greater diameter of calice, 16 mm.; lesser diameter of calice, 15.3 mm.; 

 height of corallum, 16.5 mm.; depth of fossa, about 6.5 mm. 



Locality. — San Pedro Hill, San Pedro, California. 



Geologic Horizon. — Pleistocene. 



Type.— C'dt. No. 157,509, U. S. National Museum. 



' The general arrangement of the claSBes Is that used by Eaatnmn In Zlttel'B Text-Book of Paleontol0(!y- 



»Mr. Wayland Vaughan, of the United States Geological Survey, has propareil the dlagnoees of the new Anthozoa which have 

 been found in the San Pedro deposita. These descriptions are here Included in this paper. 



