34 MADEEPOEARIA. 



to a height of 3, 4, or 5 mm., and a daughter calicle appears on each side of the directive line. 

 As the process grows, two more appear crosswise to the former two, the head of the process 

 swelling out to form a knob with the parent polyp at its inner base. Globular heads (8 mm. 

 high) and attached by stalks are found with over 12 calicles opening around them ; many of 

 these strongly resemble the suctorial " heads " of tape-worms. These developments occur 

 ahiiost exclusively either close under the margin of the cup, where its normal growth has 

 been hindered, or in the disturbed region round the mass of sediment in the base of the cup. 

 All the other specimens, except the smaller cup forms, show signs of unusual growth. Tlie 

 species is named after the yellow-brown colour of the corallum. 



One of the many very minute cups in the Collection may, from the character of the 

 calicles, belong here. 



a. (With T. jmMa) Port Denison. Saville-Kent Coll. (Type ) 



h, c. Great Barrier Eeef. Saville-Kent Coll. 



d. (A minute cup) Torres Straits. J. B. Jukes, Esq. 



Two fragments (92. 12. 1. 660 & 675), encrusting dead masses with slightly larger and 

 more projecting calicles, may perhaps have been broken off older growths of this species in 

 which the original cup had been obliterated. I have accordingly labelled them " ? fragments 

 of old stocks." One of them (c), however, may from its growth belong to the Tabidate group. 



e, /. Great Barrier Eeef. Saville-Kent CoU. 



Species 11. Turbinaria sequalis. (PI. XXXI. fig. 10.) 

 Turlinaria ccgualis, Quelch, Chal. Eep. Cor., 1886, p. 168, pi. vii. figs. Sand 3a. 



Description. — Corallum persisting at least for a time as a cup, subsequent development 

 unknown. Margin thin, with slight external wrinkling. 



Calicles not crowded, either immersed or on very slight swellings of the ccenenchyma. 

 Aperture circular, minute (1 mm. diameter and under), inconspicuous. Septa (14 to 20) 

 radiate irregularly from the margin and of iinequal length, project almost level with the 

 ccenenchyma beyond the half-radius circle, thick * and granular, bounding an irregular 

 fossa. Columella indistinct, composed of irregular granules, rising at times to the level 

 of the margin; fossa thus not apparent to the naked eye. The interseptal loculi long 

 narrow slits. 



Ccenenchyma in section massive, like solid stone ; pore-canals few and only visible under 

 a pocket-lens. Surfaces, inside and out, finely granular. 



Mr. Quelch's type specimen is a small fragment of an irregularly folded margin of an 

 old stock, the folds fused back and back. Small as it is, the fragment is covered with 



* Mr. Quelch says that the septa are thin, which is correct absolutely, but, relatively to the size 

 of the calicle, they are thick, leaving but narrow slit-like interseptal locuh. 



