MADEEPORARIA. 769 



The only purely vegetative variations appear to me to be thickness of walls, distance 

 apart, obliquity and thickness of dissepiments, degree of spinulation of feces of septa and 

 costae, though all others undoubtedly show a certain amount of this class of differences. In 

 the accompanying Table I have attempted to show the variations for the average sized 

 corallites of the several specimens, taking in each case what appear to be their most vigorously 

 growing, i.e. upper surfaces, and finding the average size from a measured patch (excluding 

 obviously young forms) and in each measurement taking an average. Some of the smaller 

 specimens are young colonies. 



Locality. Found commonly everywhere in the Maldives and in Minikoi, on the outer 

 slope, any tint reasonably bare of sand and on the lagoon shoals. Nos. 1 and 2 in the Table 

 have septa thickened up to 1 mm., where they pass into the theca. Colour, brown to green, 

 darker over walls. 



25. Fa via laccadivica, n. .sp. (PI. LXII. fig. 24.) 



Colony massive, edges closely encrusting, thick transversely marked epitheca. Walls thick, 

 except where fission taking place, generally not less than 2 mm., top exothecal dissepiment 

 level with top of theca. Calices always rounded, often oval, average diameter in different parts 

 8 to 9 mm., depth 2'5 to 4'5 mm. Costae, equal, finely toothed, almost fiat-topped between 

 calices (no notch), slight tendency to join transversely, on thicker walls smaller costae often shown 

 by a few or a row of spines, represented by septa IV. Septa, 1 to 1'5 mm. exsert, very fiat- 

 topped, 4 cycles, not very distinct or regular, 12 to 16 reaching columella, 12 to 16 intermediate, 

 equal in thickness, two-thirds way to columella, often fusing to the first series, and 24 to 32 

 generally minute, angular ridges between the larger, often wanting ; septa I., II. and III. fine 

 pointed teeth, not crowded, passing into ridges on their slightly granular sides, commonly 12 to 

 16 with the lowest a larger pointed tooth rising about 2 mm. above the fossa, forming a pali- 

 crown. Columella quite distinct, } width of calice, flattened twisted plates from about 12 septa. 

 In section exothecal dissepiments thin, flattened or arched, the convexity above, 1 mm. apart, 

 endothecal thin, oblique (60°), 1 to 1'5 mm. apa\t. 



The specimens are very markedly different from anj^ other Fa via I have in the collection 

 owing to the great regularity in thickness of all their parts, exsertness, teeth, etc. of the 

 septa and the complete absence of a furrow. I cannot find any described species, which in 

 any way resembles it. The specimens show singularly little variation, those on the sides 

 merely have thicker walls and costae IV. accordingly more distinct. 



liOcality. Three specimens from lagoon shoals, Minikoi. Colour, grey over walls, dark 

 green peristome. 



26. Favia hululensis, n. sp. (PI. XLI. 19—21.) 



I refer four massively growing, complete colonies and two smaller pieces to this species. 

 It differs from F. denticulata in the following characters: Walls, thin (1 to 2 mm.), theca 

 very distinct above the top exothecal dissepiment. Calices more compressed, sometimes angular 

 or oval, average size 5— 75 mm. in diameter, 3 — 4 mm. deep. Costae continuous between 

 calices, notched, generally no furrow, sometimes traces of transverse connections, equal in number 

 to septa. Latter 5 — 2 nun. exsert, flat-topped, about 20, cycles more or less distinct, outer 

 part of slope perpendicular ; teeth variable, on the exsert part small, pointed, round, and inside 

 the calice generally none or only 2 or 3, small, well separated and pointed, often the lowest 

 on 6 to 8 of the larger septa blunt, paliform, otherwise these septa perpendicular against axial 



