758 J. STANLEY GARDIXER. 



II. ASTRAEIDAE. 



The specimens of this family number about 400 : many are small fragments, or from 

 the same colony, or young colonies, so that only about half are enumerated as being of 

 use for comparative purposes. They are divided into 69 species of 21 genera. The number 

 of the latter is remarkable as compared with the 12 genera obtained by me in the Pacific 

 and the 16 genera (omitting synonyms) described by Khmzinger fi-om the Red 8ea. Definite 

 comparisons and general observations on the family I defer until the whole collection has 

 been worked out. 



I have with certain exceptions an-anged the genera according to Duncan's classification 

 {Linn. Soc. Journ., vol. xviii. pp. 1 — 204), which is in need of thorough revision. Where no 

 references to the genera are given, they are implied to this work. As defined by Duncan 

 I use the term condlite as an individual member of a colony, calice as the upper opening 

 of the corallite within the theca (or epitheca if it extends to the opening), and columella 

 as the structure which fills vip the axis of the corallite or calice. When a definite structure 

 is laid down covering the outermost sides of a colony or a simple coral, it is termed 

 epitheca ; it has everywhere a morphological character in that it is deposited from one side 

 only, i.e. the inner, no j^art of the living tissues extending outside it. The wall is the 

 structure which separates a calice from the exterior, or two calices from each other. The 

 dejJth of the calice is the vertical distance between the top of the theca and that of the 

 columella. Dissepiments are of two kinds, exothecal and endothecal, outside and within the 

 theca. 



I. Genus Antillia. 



1. Antillia constricta Briig., var. maldivensis nov. (PI. LIX. figs. 4 and 5.) 

 Briiggemann, Ann. Mag. Nat. Hist., ser. 4, vol. XX. p. 309 (1877). 



The species has a columella formed of trabeculae flattened parallel to the long axis of 

 the corallum, while var. maldivensis has a spongy columella with a rather papillose 

 surface. 



My three specimens measure (1) 75 mm. long, 43 mm. broad, narrowest 19 mm., and 

 57 mm. high, (2) 74 x 48, naiTowest 18, and 52 mm. high, the corallum rather bent at the 

 base, and (3) 69 x 42, narrowest 18, and 37 mm. high. The epitheca varies from 6 to 25 mm. 

 from the edge of the cup. The smallest specimen closely agrees with the type in its shape 

 and septal an-angements. In neither of the others is there any marked elevation of the 

 walls on either side of the central constriction, and (2) is rather irregular at one end as 

 if a second constriction was commencing to form. Septal cycles I — IV join the columella, 

 and in the larger specimens the paliform lobes of III often approach in size and appearance 

 those of the first two cycles. The specimens are 20, 20, and 15 mm. deep fi-om top of theca 

 to top of columella ; the septa are 2'5 — 3 mm. exsert. 



Locality. Suvadiva, 31 /". 



II. Genus Cylicia. 



2. Cylicia ^stellata Dana. Dana, p. 377, XXViii. 5. 



I have not seen sufficient specimens of the genus — the British Museum has Ed. and 

 H.'s type of C. excavata = C. tenella, but it has never been properly cleaned, and I can 



