A REPORT ON THE CYCLOSTOMATOUS URYOZOA OF JAPAN. 



345 



is a form approaching the Crisiidcs rather than the Tubuliporidœ, Crisulipora 

 Ijimai may be said to agree well with the Tubuliporidœ, save in having cor- 

 neous joints in common with the Crisiidœ. In fact, the form and arrange- 

 ment of zooecia and especially the character of ooecium as well as the 

 absence of flexible rootlets and basis rami make the new species more 

 readily associable with the Tubuliporidœ than Crisulipora occidentalis. 



Tubulipora Lamarck 1816. 

 10. Tubulipora atlantica (Johnston) 1847. 



Tubtdipora atlantica, Osburn 1^12 (1), 217, pi. xx, figs, g, ga. — Osburn igi2 (2), 276. — Harmer 

 igi5 (2), 124, pi. x, figs. 4, 5. 



Idmonea atlantica, Johnston 1847 ( 2 )> 2 7^> p'- xlviii, fig. 3. — Busk 1856 (1), 34, pl. I, fig. 6. — 

 Busk 1858 (2), 128, pi. xviii, fig. 5. — Busk 1875 (4), 11, pi. ix. — Smitt 1872 (4), 6, pi. 

 ii, figs. 7, 8.— Hincks 1877 (2), 108.— Waters 187g (i), 26g.— Hincks 1880 (3), 451, pi. 

 lxv, fig. 1-4.— Waters 1884 (2), 683,— Busk (pars) 1886 (5), 10. — Ortmann 1890 (1), 

 58, pi. iv, figs. 20, a-b. — Calvet i8g6 (r), 265— Bidenkap, igoo (1), 527. — Norman 

 igo3 (1), 575— Waters igo4 (7), go. — Nordgard igo7 (1), 16. — Waters igi4 (10), 166. 



Tubulipora atlantica, form, erecla, Smitt 1866 (3), 3g9, pi. iii, figs. 6-7; pi. iv, figs. 4-13. 



Of this species there exist in the collection : some fragments from off 

 Inatori, and a complete zoarium from a depth of 80 fins, off Jôgashima. 



11. Tubulipora atlantica, var. tlisticha (Ortmann) 1890. 



Idmonea atlantica, var. disticha, Ortmann i8go, (1), 58, pi. iv, fig. 20. 



Some small colonies which may be identified with the above form exist 

 in the collection. The localities are : Oshima (depth unknown), Onigase 

 (15C-300 fms.) and off Jôgashima (70 fms.). The specimens in spirit are 

 milky white, frequently with a faint pinkish tint. A structural feature, which 

 was not mentioned by Ortmann, the original describer of the form, consists in 

 the presence of a peculiarly characterized area at the base of main stem on 

 the dorsal side. The area which may be called the dorso-basal plate extends 

 from the very base a short distance up the stem and is sharply marked off 

 from the minutely punctured general surface of the stem by a slight border 

 ridge. The surface of the plate is unpunctate and even, except for being 

 pitted by a number of short groove-like depressions, which at their one end 



