54 



rectum between the two ductus ejaculatorii. He could not make out the chords ("connectifs") 



unitincr the one eano-lion with the other, but he admits that such nervous chords exist. I did 



not observe them either, but I found that a rather large ganglion is situated between the eye 



and the wall of the stomach, so that the eye nearly rests on or against this ganglion. From 



this ganglion (the optic ganglion ?), which seen laterally as in fig. 3 of PI. V is oval, but which is 



broadly heart-shaped when seen from above, two very distinct nerves run, as may be supposed 



but could not be made out, to the cerebral ganglion. 



The "Siboga" collected this species at the following places and stations: 



Stat. 19. March 19 — 21, 1899. Bay of Labiian Tring, west coast of Lombok. On shore. 



Stat. 47. April 8 — 12, 1899. Bay of Bima. On shore. 



Stat. 50. April 16 — 18, 1899. Bay of Labuan Badjo, West coast of Flores. On shore. 



Stat. 115. July 9 — II, 1899. East Side of Pajunga Island. Kwandang Bay. On the reef. 



[N.B. Dr. C. Ph. Sluiter sent me, about 1884, specimens of an Ibla found by him 

 at Tandjong Pandan (Billiton) on corals which belong undoubtedly to this species.] 



Genus Scalpellum Leach 



Of all the known genera of Cirripedia this is the richest in species. In his Monographie 

 des Cirrhipedes of 1905 Gruvel distinguishes in all 93 species of Scalpellum — that this number 

 by no means includes all the existing forms is proved by the collection of the "Siboga". It 

 contains 38 species of this genus and 32 of these have not been described before. 



This augmentation seems especially considerable, if we take into consideration the relatively 

 small area that has been explored by the Dutch man-of-war: all these new species were collected 

 within the Malay Archipelago. 



The number of species of the present genus hitherto known with certainty as occurring 

 in that archipelago was sixteen, viz. : 



Sc. villosum Leach. Eastern Seas (Darwin) (? India, Timor, New Holland). 



Sc. trispinos2nn Hoek. Philippine Archipelago. 



Sc. rostrahun Darwin. Philippine Archipelago. 



Sc. compressutii Hoek. Between Celebes and Sangir Islands. 



Sc. album Hoek. North of Karakelang, Talaut Islands. 



Sc. hirsutum Hoek. West of Batjan, East of Celebes. 



Sc. rubrum Hoek. Philippine Archipelago. 



Sc. irjincatum Hoek. Between New Guinea and Australia, East of Cook Peninsula. 



Sc. moluccanwn Hoek. South of Ceram. 



Sc. australicum Hoek. Between New Guinea and Australia, East of Cook Peninsula. 



Sc. distijichun Hoek. North of New Guinea, eastern half. 



Sc. uidiciim Hoek. Kei Islands. 



Sc. dubium Hoek. Between New Guinea and Australia, East of Cook Peninsula. 



Sc. balanoides Hoek. Kei Islands. 



Sc. marp-inahim Hoek. ) ,, , ^ „^ ^ . , .^ 



North of New Guinea, western half. 

 Sc. ova turn Hoek. ) 



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