90 



MADREPOBAEIA. 



a. Tizard Bank, 5 fath. 



b. Tizard Bank, 5 fath. 



? c. Tizard Bank, 5 fath. 



?d. Tizard Bank, 6 fath. 



? e. Tizard Bank. 



/. Tizard Bank. 

 g. Macclesfield Bank. 

 h-r. Macclesfield Bank, 13 fath. 



Var. bceocyathus. 



a-€. Macclesfield Bank, 13 fath. 



H.M.S. ' Rambler.' 89. 9. 24. 115. 



(= M. «fl!*M/ff,B. -Smith.) iTvnes 



H.M.S. ' Rambler.' 89. 9. 24. 114. '' 



(= M. effusa, B.-Smith.) 



H.M.S. ' Rambler.' 89. 9. 24. 97, (= M. valida, 



B.-Smith.) 



H.M.S. ' Rambler.' 89. 9. 24. 111. (= M. planti- 



ffinea, B.-Smith.) 



H.M.S. ' Rambler.' 89.9.24.106. { = M. corym- 



bosa, B.-Smith.) 



H.M.S. ' Rambler.' 93. 4. 7. 155. 



H.M.S. 'Rambler.' 89. 9. 24. 71. 



H.M.S. ' Penguin.' 92. 10. 17. 44 to 54. 



H.M.S. ' Penguin.' 92. 10. 17. 55 to 59. 



82. Madrepora quelcM. (Plate XXXII. figs. D, E.) 



Madrepora effusa, Quelch {non Dana), ' Challenger ' E«et Corals, p. 154. 



Corallum half-vasiform from a lateral stalk, 24 cm. wide and 12 cm. 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. 

 Aiial corallites cylindrical, 2 to 25 cm. diameter, and 2 to 3 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 

 qnite 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 



