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where it is still preserved. From a copy of these unpublished Plates in my own possession I 

 am able to state that PI. XIII, fig. 4 of Desmarest and Lesueur gives what appear to be 

 very characteristic figures of the species under consideration. According to Pergens, the MS. 

 name of this species is Sirinx circumplicata \ and it is identified by him with A. crispa Lamarck. 

 It is unfortunate that the original names and descriptions were never published by Desmarest 

 and Lesueur ; but it seems obvious that most of the names published by Pergens in 1887 have 

 no validity, as they refer to figures which are not technically in existence, and for the most 

 part (as in the case under consideration) are mere citations of names, not accompanied by any 

 kind of description. It may be worth while to emphasize the view that even in cases where 

 Pergens has given valid reasons for retaining these MS. names, they cannot be ascribed a date 

 earlier than 1887, when they were first published; whereas Pergens appears to have assumed 

 that, after his introduction o'f them, they could be ascribed to the year (1829) when the MS. 

 was deposited in the Paris Museum. 



2. Amathia disfans Busk. (PI. V, fig. 6, 7). 



Atnathia distans Busk, 1886, Challenger Rep., Pt L, p. 33, PI. VII, figs 1 — 1 c. 

 ? Amathia distans MacGillivray, 1895, "Austr. Species Amathia", Proc. R. Soc. Vict. (N. S.), 



VII, p. 134, PI. C, figs 3, ia. 

 ? Amathia distans Thornely, 1905, HERDMAN's "Rep. Pearl Oyster Fisheries G. Manaar*', Publ. 



Roy. Soc, Suppl. Rep. XXVI, "Pol.", p. 128 (Gulf of Manaar; no description). 

 ? Amathia distans Thornely, 1907, "Rep. Mar. Pol. Ind. Mus.", Ree. Ind. Mus., I, p. 196 (Coast 



of Cheduba, Burma; Andamans; no description). 

 ? Amathia acervata Lamouroux, 1824, "Encycl. Méthod.", "Zooph.", p. 45 (Japan). 

 ? Amathia tor/nosa Waters, 1910 (nee Tenison-Woods), "Rep. Mar. Biol. Sud. Red Sea", 



u Bry. II", J. Linn. Soc., Zool., XXXI, p. 243, PI. XXIV, fig. 5. 



a 1 -y TT \ 



' . ' \ Stat. 7. Near Reef of Batjulmati, Java, ie. Metres and more; coral and stones. 

 436. A. ) ' j j j 



' "j Stat. 50. Bay of Badjo, W. coast of Flores, o — 40 Metres; mud, sand and shells. 



284. A. Stat. 58. Anchorage off Seba, Savu, O — 27 Metres; sand. (On a stone). 



371. C. Stat. 273. Anchorage off Pulu Jedan, Aru Islands, 13 Metres; sand and shells. 



Zoarium small, repent, attached here and there to the substratum by rootlet-like tubes. 

 Internodes about 100 p. in diameter, with a thick cuticle. Zooecia biserial, in spiral groups 

 which occupy the distal part of the internode and usually form one complete turn or less. The 

 proximal part of the internode carries no zooecia, and about half the internode is thus bare. 

 The branching appears dichotomous, owing to the fact that the prolongation of the stem and 

 the lateral branch form nearly equal angles with the part of the stem preceding the bifurcation. 

 The ramification is not regularly alternate, a branch being sometimes developed on the same 

 side of the stem as its predecessor, but often growing out from a point which is 90 removed 

 from that which gives rise to the preceding and succeeding branches. Consecutive branches 

 thus commonly lie in two planes at right angles to one another, instead of lying, on opposite 

 sides of the stem, in the same plane, as in A. convohtta. A transverse diaphragm, sometimes 

 oblique, occurs at the distal end of the internode, in the region where the group of zooecia ends; 



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