12 2 



During the cruise of H. M. S. "Siboga" specimens of this species were collected on two 



occasions : 



At Station 51 : Madura Bay in the southern part of Molo Strait; on the shore. About 



20 specimens. 

 At Station 50: Bay of Badjo (West coast of Floras); on the shore. 



N.B. As mentioned already p. 47 specimens of Ibla Cumingi Darwin were found attached 

 to several specimens of P. initclla at Station 5 1 . 



Genus Lithotrya Sowerby 



Of this genus six species were known to Darwix in 1851 and only one new species 

 (Z. pacijica Borradaile) has been added to this number in the 55 years since then. They are found 

 lodged in cavities, in calcareous rocks, shells, or corals and have been observed "generally" 

 within the tropics. All the species occur only in shallow water. 



In the Malay x'\rchipelago and in Australian waters, 4, perhaps 5, of the known species 

 have been observed: L. canfa Darwin, New South Wales, Australia; L. nicodarica YLhdt., Timor; 

 L. truncata Quoy et Gaimard, Philippines; L.pacifica Borradaile, Funafuti. [Perhaps L. rhodiopiis 

 J. E. Gray, the habitat of which was unknown to Darwix, belongs to the same region also; 

 the Copenhagen Museum possesses specimens labelled L. rliodiopiis J. E. Gray, Eunafuti; they 

 are specimens purchased from the IMuseum Godefroy.] 



H. M. S. "Siboga" met with specimens of this genus on five different occasions; four 

 different species are represented in this collection. 



I . LitJiotrya nicoharica Rhdt. 



Reinhardt (1850) has given the description of this species founded on specimens from 

 the Nicobar Islands. Darwin (i 851) when giving the description of this species in his Monograph 

 had Reinhardt's paper at his disposal, but he could not compare the typical specimens used 

 by Reinh.\rdt. The specimens which Darwin identified with R.'s species were from Timor. 



Through the courtesy of the Director, Prof. Jungersen, and the Keeper of the collection 

 of Crustacea, Dr. Meinert, of the Copenhagen Museum, I got free access to the specimens of 

 this species which are to be found in that Museum. They are — according to the label — from 

 Pulo Milu, Galatea. As Galatea Bay is the name of a Bay of the Island Sambelong (Great 

 Nicobar), and as they are the only specimens of this species in the Museum, the probability 

 that they are the original specimens of Reinhardt seems great'. They correspond with Darwin's- 

 description and figures in all essential regards. 



Several forms collected during the cruise of H. M. S. "Siboga" belong doubtless to this 

 species. They are from two different Stations: from the reefs near Lucipara and from the 

 reefs of the Island of Kur, West of the Kei Islands. At both places, however, together 



' These had not been put aside as type-specimens, as is now the custom with specimens which have served for the institution 

 of "novae species", so that Dr. Mei.nert could not say witli absolute certainty, that they were Reinhardt's types. 



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