70 PERCY SLADEN TRUST EXPEDITION" 



2 mm., ■usually one side higher than the other. Wall "75 mm. thick. Calices on the whole 

 smaller than in the two previous species but of" uniform width from margins to bases, 

 average diameter 3 mm., depth 2 mm. 



Septa usually thicker in calices than in B. ehrenbergana, exsert to 75 or 1 mm. 

 Sides with short spines, in three complete orders, quaternaries absent or up to 6. 

 Primaries usually thicker than secondaries, both — often also 1 to 3 tertiaries — meeting 

 columella ; septal edges vertical, each usually with a paliform lobe near the columella either 

 upright or directed obliquely inwards with sometimes an additional blunt tooth or two 

 above it. Costae as low flat ridges. Columella thicker than in B. ehrenbergana, from 

 a third to half the width of calices, with sometimes short rods. 



Giant corallites 4 — 4 '6 mm. in, diameter with from 16 — 22 septa meeting columella, 

 frequently found among the normal ones (PI. 18, figs. 5 and 6). Occasionally two 

 corallites fuse, presenting an appearance of fission (PI. 18, fig. 4). 



No polyps. 



Remarks. Corallum. Milne Edwards and Haime's smaller figured example of 

 Cyphastrcea hottai is massive, measuring Il"5xl0x8cm. (PL 18, fig. 8). Its calices 

 range up to 3 mm. in diameter (average 2 — 2'5mm.); the six primaiy septa in each 

 corallite are thicker than the secondaries, the former and a varying number of the latter 

 meeting the columella from which short rods project ; on the whole it resembles 

 specimen no. 15 on p. 71. But, as the second larger example referred by Milne Edwards 

 and Haime to the same species is a true Cyphastrcea (most probably C. serailia), the 

 specific name hottai cannot be given to the present species. Unfortunately Milne 

 Edwards and Haime's type of Baryastrcea solida is missing from the Paris Museum, 

 but since the two figures agree completely with my type specimens I have applied 

 the name solida to the present species. 



A specimen (13x8x9 cm.) from St Thomas in the Paris Museum named Chypastrea 

 oblita by Duchassaing comes near the present species. Its chief characters are as follows : 

 peritheca vesicular, with spines ; calices circular up to 3 mm. in diameter, average 

 2'5mm. ; septa in three orders of 6, 6 and 12, primaries and secondaries in every 

 corallite meeting columella, each dropping vertically for the greater part of its height, 

 then passing obliquely or horizontally inwards to meet columella, the latter region 

 of septum with 3 — 5 conspicuous blunt teeth ; primaries somewhat thicker than second- 

 aries ; columella with short rods. 



Klunzinger's figured example (12x12x7 cm.) of L. hottai has no paliform lobes ; 

 in each corallite both primary and secondary septa meet the columella with which 

 twelve tertiaries alternate ; a few giant-corallites are present. Resembling this are 

 his figured type (8x7 cm.) of L. incequalis and another small specimen from Koseir in 

 the Paris Museum, to which Klunzinger has given the same name. 



Localities. Red Sea (6). Maldives : Hulule (3); Goidu (2). Minikoi (8). Chagos, 

 Salomon (12). ? Also from St Thomas (Duchassaing and Michellotti). 



4. Leptastrea ? iMMERSA, Klunzinger. 



1879. Leptastrcea ininiersa, Klunzinger, Korall. Roth. Meer., iii, p. 47, pi. 6, fig. 1. 

 1904. Orbicella immersa, Gardiner, Fauna Geogr. Maldives and Laccadives, p. 776. 



