90 MADREPORARIA. 
a, Tizard Bank, 5 fath. H.M.S. ‘Rambler’ 89. 9. 24. 115. 
(= M. nasuta,B.-Smith.) Types. 
6. Tizard Bank, 5 fath. H.M.S. ‘Rambler’ 89. 9. 24. 114. 
(= M. effusa, B.-Smith.) 
?¢. Tizard Bank, 5 fath. H.M.S. ‘ Rambler.’ 89.9. 24.97. (= M. valida, 
B.-Smith.) 
?d. Tizard Bank, 6 fath. H.M.S. ‘Rambler 89.9.24. 111. (= M. planti- 
ginea, B.-Smith.) 
?e. Tizard Bank. H.M.S. ‘Rambler’ 89.9.24. 106. (=M. corym- 
bosa, B.-Smith.) 
f. Tizard Bank. H.M.S. ‘Rambler.’ 93. 4. 7. 155. 
g- Macclesfield Bank. H.M.S. ‘Rambler’ 89. 9. 24. 71. 
h-r. Macclesfield Bank, 13 fath. H.M.S.‘ Penguin’ 92. 10. 17. 44 to 54. 
Var. beocyathus. 
a-e. Macclesfield Bank, 18 fath. H.M.S. ‘Penguin.’ 92. 10. 17. 55 to 59. 
82. Madrepora quelchi. (Plate XXXII. figs. D, E.) 
Madrepora effusa, Quelch (non Dana), ‘ Challenger ’ Reef Corals, p. 154, 
Corallum half-vasiform from a lateral stalk, 24 cm. wide and 12cm. high. Branches 
oblique, 1 cm. diameter, a little flattened on the under surface, with scattered, appressed, tu- 
bular corallites below, and a few short lateral twigs ; the proximal parts are more or less 
coalescent, but the distal parts are free. The branchlets on the upper surface are distant, 
erect, and tapering; length 4 to 8 cm., diameter 8 to 11 cm.; apices about 2 cm. apart. 
Axial corallites cylindrical, 2 to 2°5 em. diameter, and 2 to3 mm. exsert ; the septa are in two 
cycles, the primary series being subequal and not very prominent. Radial corallites chiefly 
elongate, compressed, and spreading tubular ; the aperture is oblique, or more frequently a 
narrow slit extends for a variable distance along the upper (inner) part of the wall, sometimes 
quite to the base. In passing downwards the form becomes tubo-labellate, spout-shaped, and 
finally verruciform towards the base of the main divisions. On the distal parts of the branches 
the more prominent corallites are arranged in more or less regular longitudinal rows, with a 
few immersed corallites between ; length 2°5 to 6 mm., average 4: mm., diameter 2 mm.; the 
wall is thickened, dense, and closely striato-echinulate ; the margin is distinctly rounded. 
The primary septa are well developed, the directives broadest ; the second cycle is more or less 
fully represented, but is not complete in the immersed corallites. 
Var. paradoxa. (Plate XXXII. fig. D.) 
Branches on the upper surface erect, 11 cm. long, and divided into three or more 
parallel divisions, in which the axial corallites are scarcely prominent. The tubular radial 
corallites are similar to those of the type, but the margin is scarcely rounded, and the aper- 
ture is more rarely elongate. On the lower parts of the branchlets swollen hemicotyloid and 
immersed corallites occur in place of verruciform ones. The immersed corallites are 
numerous, about 1 mm. diameter, and exhibit a prominent star in which two or more of the 
