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56.1!. St.it. 8o. Borneo Bank, 2°25'S., ii7°43'E., 40—50 Metres; fine coral-sand. 

 '405. B. Stat. 91. Muaras Reef, E. coast of Borneo, 0—54 Metres; hard coral-sand, coral (on 



a Sponge). 

 88. B. Stat. 115. E. side of Pajunga Island, Kwandang Bay; reef-exploration (on Porites). 

 108. P. Stat. 144. Anchorage N. of Salomakiëe (Damar) Island, 45 Metres; coral-bottom and 

 Lithothamnion (on a Hydroid). 

 •396. L. Stat. 162. Between Loslos and Broken Islands, \V. coast of Salawatti, 1S Metres; 

 coarse and fine sand with clay and shells. 

 130. H.\ Stat. 164. i°42.5 S., I30°47'.5E., 32 Metres; sand, small stones and shells. (130.0 is 

 1 30. O. ) on slide 1 30. M 2 , Bowerbankia ? imbricata). 



*566. G. Stat. 204. Between Islands of Wowoni and Buton, 75—94 Metres; sand with dead shells. 

 376. A. Stat. 213. Saleyer Anchorage. o — 36 Metres; coral-reefs, mud and mud with sand. 



(On slides 376. B. 3 , B. 4 , Araclinidium irregularé). 

 276. A.) Stat. 250. Anchorage off Kilsuin, W. coast of Kur Island, 20—45 Metres; coral and 

 *279. E. ) Lithothamnion. 

 "195. C. Stat. 274. 5°28.2S., i34°53'.9E., 57 Metres; sand and shells, stones. 



Zooecia varying greatly in size, according to the state of their development, the ectocyst 

 usually striated transversely and including numerous particles of fine mud. Adnate portion 

 represented merely by the stolon-like proximal portion and by the base of the cylindrical portion, 

 which consists almost entirely of the peristome. This base gives off four or more stolon-like 

 threads, which may bifurcate after a time and ultimately pass into new peristomes. Fertile 

 zooecia containing several embryos near their distal end, and often very irregular in outline in 

 the region of the ovary or embryos. 



The specific differences between the forms which have been referred to Nolella or 

 Cylindroecium are at present very obscure; particularly if I am right in believing that the same 

 species may be extremely variable, in respect of the size of the zooecia, according to its degree 

 of development. I have referred the present species to N. papuensis Busk mainly on account 

 of the identity in locality; although an examination of Busk's specimens in the British Museum 

 ( s - . 12.9. 941. and 99.7. 1.4435.) leads me to think that the reference is correct. But the 

 question whether N. papuensis is synonymous with N. gigantca is so difficult that I am not 

 prepared to answer it. The fertile zooecia of the present species have a close resemblance to 

 those described by Prouho v ), apparently from Banyuls, under the name of C. dilatatuiu. But, 

 from the examination of Hincks' type-specimen (Brit. Mus., 99. 5. 1. 1510), unfortunately a dry 

 specimen from which little can be made out, I am not confident that Prouho's reference was 

 correct. The 'Siboga' specimens also show considerable resemblance to N. gigantea Busk 3 ), the 

 type from Tenby (S.Wales), in the British Museum (99.7. 1.4434.) being much like the large 

 'Siboga' specimens. Busk does not mention the embryos, several of which are, however, present 

 in his specimen, although they appear to contain more yolk than in the 'Siboga' form. Another 

 slide (99.7. 1.4426) in the British Museum, also from Tenby, was labelled by Busk " Cylin- 

 droecium gigant cum var., seu C. dilatatum'\ The zooecia are not more than half the length 

 of those on the other Tenby slide; but this may merely indicate that the British species is as 

 variable in length as the Malay form. 



1) Prouho, II., 1S92, Arch. Zool. Exp. (2) X, p. 626, PI. XXIV, figs 14—17. 



2) Busk, G., 1856, »Zoophytology", Ouart. J. Mier. Sci., IV, p. 93, figs 1 — 3. 



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