﻿.'}74 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



La Cj/phnstrea obliki a lea l)orcIs moina eleves, et les cloison.s plus debordautes cjiie 

 oelles de la Cyph. microphthalma qui soiit aussi garnies d'une petite dent subpali- 

 forrae qui manque daus la Ci/ph. oblita. St. Thomas. 



I found in the Museum of Natural History at Turin a specimen 

 labeled " Gyphastrea ohlita." It is a specimen of Orbicella annularis. 

 Another specimen bearing the same label, seen in the Museum d'His- 

 toire Naturelle at Paris, is a Solenastrea} The latter is a rounded 

 liead with a greater diameter of about 130 mm. The caUces range 

 in diameter from 2 to 3 mm.; distance apart from somewhat less to 

 slightly more than 1 mm., occasionally 2 mm. Margins of the calices 

 marked by a slightly raised rim. Costae insignificant, occasionally 

 extending from one calice to the next. Septa in three complete 

 cycles, primaries and secondaries reaching the columella; tertiaries 

 shorter, with inner edges free, i. e., not fused to the sides of a lower 

 cycle. Pali variable in development; in some calices they are large, 

 flattened above, before all septa except the last cycle; in others, 

 several teeth indicate the position of a palus. Columella, lax and 

 papillary. This specimen is the same as the Heliastraea ahdita 

 Duchassaing and Michelotti. 



The original description of Oyphastrea ohlita is not adequate for 

 identification. One of the specimens from the Duchassaing and 

 Michelotti collection is Orbicella annularis^ the other the same is their 

 own Heliastraea ahdita. Because the Paris specimen is probably the 

 type I am placing the species in the synonymy of Solenastrea hour- 

 noni M. Edwards and Haime (see p. 400). 



Heliastraea roiulosa Duchassing and Michelotti is a growth form of 

 0. annularis, judging by the description. I did not find the tj'-pe in 

 Turin . 



The specimens determined by Duchassing and Michelotti as 

 Heliastraea acropora (Linnaeus) and H. lamarcki Milne Edwards and 

 Haime are, according to specimens bearing those names in tlic 

 Museum of Natural History at Turin, referable to Orbicella annularis. 



The type of Duncan's CypJiastraea costala from Barbuda is pre- 

 served in the Geological Society of London, and I studied it there. 

 The specimen shows no noteworthy variation from the usual Orbicella 

 annularis, except that its calices are from 3 to 4 mm. in diameter, 

 usually 3.5 mm. Another specimen, from Santo Domingo, labeled 

 CypJiastraea costaia is a Solenastrea. The specimens determined by 

 Gregory as C. costata were studied in the British Museun of Natural 

 History; they are 0. annularis. 



Astraea harbadensis Duncan is a specimen of 0. annularis from the 

 Pleistocene reefs of Barbados. 



' Illustrations of this specimen have been published by me in U. S. Geol. Surv. Prof. Pap. 98-T, pi. 99, 

 figs. 3, Za, 1917. 



