374 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



La Cyphastrea oblita a les bords moins eleves, et lea cloisons plus debordautes que 

 celles de la Cyph. micro phthalma qui sont aussi garnies d'une petite dent subpali- 

 forme qui manque dans la Cyph. oblita. St. Thomas. 



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

 labeled " Cyphastrea oblita." 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 

 head 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 cahces 

 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. Pah variable in development; in some cahces 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 dbdita 

 Duchassaing and Michelotti. 



The original description of Cyphastrea ohlita is not adequate for 

 identification. One of the specimens from the Duchassaing and 

 Michelotti collection is OrMcella annularis, the other the same is their 

 own Heliastraea aMita. 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 rotulosa Duchassing and Michelotti is a growth form of 

 0. annularis, judging by the description. I did not find the type in 

 Turin. 



The specimens determined by Duchassing and Michelotti as 

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

 H^ime are, according to specimens bearing those names in the 

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



The type of Duncan's Cyphastraea costata 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 Orhicella 

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

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

 Cyphastraea costata 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 harhadensis Duncan is a specimen of 0. annularis from the 

 Pleistocene reefs of Barbados. 



I Illustrations of this specimen have been published by me in U. S. Geol. Surv. Prof. Pap. 98-T, pi. 99, 

 figs. 3, 3a, 1917. 



