MATTHAI— RECENT COLONIAL ASTR^ID^ 



71 



LIST OF SPECIMENS SHOWING THE EXTENT OF VARIATION IN 

 THE GENUS LEPTASTREA. 



No. of 

 Specimen 



Eemarks 



Dongonab, Red Sea 



L. roissyana 



Salomon 



Rotuma 



L. ehrenhergana 



Funafuti 



Dongonab, Red Sea 



10 

 11 



12 



13 

 14 



15 



Hulule, Maldives 



Salomon 



L. solida 



Hulule, Maldives 



Dongonab, Red Sea 



L. roi 



roxssyana 



Corallum (11x11x9 cm.) incrusting. Most oorallites 

 simulate B. ehrenhergana in possessing distinct columella 

 with short rods and rough septa. PI. 17, fig. 4. 



Corallum (16x 11 x8 cm.) approaches L. ehrenhergana — 

 columella half to two-thirds width of calyx with short 

 rods, septa somewhat thicker and rough. PL 19, fig. 2. 



Corallum (13 x 13 x 9 cm.) has varied towards L. solida — 

 some corallites round, short paliform lobes from some 

 septa meeting columella. Giant corallites with about 

 19 septa meeting columella. 



Corallum (10 x 9 x 7 cm.) with a few giant corallites, 19 — 

 22 septa meeting columella. 



A small mass (9-5x7 x 5 cm.) with humps completely 

 covered with corallites, perhaps dropped off from a 

 large specimen. Corallites smaller and shallower, and 

 quinaries have not appeared. PI. 19, fig. 4. 



Corallum (15 x 7 x 7 cm.) incrusting with two humps on 

 one of which corallites large with diameters 5-6 x 5 mm., 

 sometimes much compressed laterally, 6x3 mm., about 

 15 septa meeting columella, up to 6 quinaries. In the 

 valley corallites small about 2 mm. in diameter with only 

 12 septa meeting columella, quaternaries about 10; among 

 these a giant-corallite 4 x 3'6 mm. with 20 septa meet- 

 ing columella. PL 19, fig. 3. 



Corallum (15'5 x 10"5 x 5 cm.) flat with even surface — 

 shows same extent of variation as in no. 6 : in one half 

 corallites large with about 6 quinaries, in the other 

 small with up to 10 quaternaries. 



Corallum incrusting on a large mass 27 x 21 x 13 cm. with 

 humps, showing considerable variation. Corallites round, 

 oval, polygonal, much compressed laterally or distorted. 

 Walls up to l'5mm. in thickness, inter-corallite furrows 

 present or absent. Calices from 2 mm. wide in depressions 

 to 8 X 3'5 mm. on eminences, depth up to 3'5 mm. Septa 

 3 — 5 orders, quinaries up to 13, 12 — 17 meeting colu- 

 mella, the latter well developed with rods or indistinct. 

 In one region near edge corallites shallow, small, wide 

 apart and without furrows. PL 18, figs. 2 and 7. 



Corallum (14 x 11 x 8 cm.) incrusting with humps — corallites 

 usually round or oval slightly projecting to 1 mm., in 

 valleys crowded together and smaller. PL 17, fig. 6; PL 

 34, fig. 8. 



Specimen small (9x6x3 cm.) approaching L. roissyana — 

 corallites polygonal, large, 4'6 x 3'6 mm. PL 17, fig. 9. 



Corallum 11 x 8 x 5 cm. ; septa meeting columella equally 

 thin ; pali and columella not well developed. A case of 

 fusion of two corallites — one giant-corallite with 21 

 septa meeting columella. PL 18, fig. 3. 



Corallum 11 x 4-5 x 4-5 cm. — corallites approaching L. 

 ehrenhergana polygonal, projecting less '5 mm., pali not 

 distinct but columellar rods. PL 18, fig. 6. 



Corallum 8-5x6x2 cm. PL 17, fig. 8. 



Corallum incrusting, corallites level or projecting about 

 ■5 mm., primary septa much thicker than secondaries, 

 usually only the former meeting the columella. Short 

 rods on columella. A giant-corallite 4-5x3 mm. with 

 44 septa, of which 15 meeting columella. PL 18, tig. 5. 



Corallum 12 x 10x9 cm. Corallites in one edge almost 

 circular and 1 mm. apart, in another edge circular and 

 projecting to 1 mm. as in L. solida. Similar to Klun- 

 zinger's figured examples of L. bottai and L. incequalis. 

 PL 19, fig. 5. 



