98 THE VOYAGE OF H.M.S. CHALLENGER. 
and less cellular structure, by its more distant and even cells, and by its thicker septa 
and costee, which have finer denticulations. 
Locality. —Mactan Island, Philippines. 
6. Astrea doreyensis (Milne-Edwards and Haime). 
Favia doreyensis, Milne-Edwards and Haime, Cor., ii. p. 432. 
The unequally raised edges of the calicles and the broad ridges give a peculiar 
appearance to this species, which is thus easily distinguished from the Astraa denticulata, 
with which it has many points of resemblance. The calicles in which division is taking 
place, or is about to take place, are much elongated and often irregular, with a diameter of 
from about 10 to 12 mm. 
Locality.—Banda. 
7. Astrea speciosa, Dana. 
Astrea speciosa, Dana, Zoophytes, p. 220, pl. xi. fig. 1. 
A portion of a large specimen was obtamed. Owing to the very light structure of 
the species, the upper portions of the exsert septa are often broken away, a somewhat 
ragged appearance resulting. I have followed Studer in keepimg the species distinct 
from both Astrea (Favia) okeni, Milne-Edwards and Haime, and Astrewa (Favic) 
tubulifera, Klunzinger. 
Locality — Banda. 
8. Astrea ananas (Ellis and Solander). 
Madrepora ananas, Ellis and Solander, Zoophytes, p. 168, pl. xlvii. fig. 6. 
Favia ananas, Milne-Edwards and Haime, Cor., ii. p. 435. 
A single small specimen was obtained, incrusting a piece of rock. In the young 
stages the species appears to be very close to the broad-walled form of Astrea fragum, 
and also closely resembles the Astrea porcata, Esper,’ which is found in the East Indies. 
Locality. —Bermuda. 
9. Astrea coarctata (Duchassaing and Michelotti). 
Favia coarctata, Duchassaing and Michelotti, Mém. Cor. des Antilles, p. 76, pl. x. figs. 17, 18. 
The specimen which I have referred to this species consists of a small colony of five 
calicles, which was found growing on the base of a large Mexandrina. Two of these 
calicles are subcireular, while the other three are much elongated, and two of them show 
' Pflanz. Forts., Madrep., pl. 1xxi. 
