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This species was taken at : 



Stat. 74. Tune 8, 1899. Lat. 5 3'-5 S., Long. 119° o' E. Depth 450 m. Bottom: Globigerina ooze 

 (obviously a thin layer). Two specimens, which, according to the label, were 

 attached to a spine of Goniocidaris florigera. 



General Rem ark s. Long after the above description was written, I found in Annandale's 

 "Preliminary Report on the Indian stalked Barnacles" (published April 1906) \ that a form of 

 Megalasma occurs in the Andaman Sea at a depth of 290 — 775 m. which "aorees in even- 

 respect with Hoek's striatum from the Philippines, except that the semicircular ridge on the 

 lower part of the capitulum, which forms a conspicuous feature in the latter, is quite absent". 

 Annandale has called this form a subspecies [M. striatum, subsp. minus nov.), not a variety, 

 "because it seems to represent a well-defined local race, differing only slightly from the typical 

 form, but with a constant difference". 



This is the only information at hand regarding this " subspecies" — 110 figure is o-iven. 

 I would not be astonished, however, if this form and my new species M. liucatum proved to 

 be identical s . 



Genus Alepas Sander Rang 



Darwin (185 1) enumerated four species of the genus Alepas: two of these he saw and 

 investigated himself {A. minuta Philippi and A. cornuta Darwin), the two others [A. parasita 

 Sander Rang and A. tuöulosa Quoy et Gaim.) were known to him only from figures and 

 descriptions published by Quoy & Gaimard, Sander Rang and Lesson. The "Challenger" collected 

 a fifth species of this genus which was described by me in 1883 as A. pedunculata. Six other 

 species have since then been added to the list, viz. two by Aurivillius 3 (A. quadrata and 

 A. japonicd) and four by Gruvel * (A. Belli, A. indica, A. microstoma and A. Lankesteri). 

 The latter author in his "Monographie" (1905), p. 164, has given a synoptical table for the 

 determination of the 1 1 species of this genus known to him. 



Since then, Annandale 5 has described three more species of this genus, viz. two (1905): 

 A. gigas collected in Bali Straits and A. malaysiana dredged in Gaspar Straits, and one (1906): 

 A. xenophorae found off the S. W. coast of (English) India. 



To this number of 14 species come those dredged by the "Siboga" on different occasions 

 in the Malay Archipelago. They represent in all five different forms, which I think must all 

 be considered as new species. Two of the new forms are however represented by one specimen 

 only and as it is impossible to describe these without dissection, I shall only give a figure with 

 a short description of the outward shape : they have been named A. ovalis (taken YV. from 

 the Key Islands at a depth of 984 m.) and A. tennis (S. of Ceram at 204 m. depth). 



The other three new species are represented by numerous specimens. I propose to name 



1 Annals and Magazine of Natural History. (7), XVII, April 1906, p. 399. 



2 A good figure is given in the "Illustrations of the Zoology of the R. I. M. S. S. Investigator" Calcutta, 1907. Annandale's 

 subspecies and my new species are identical. (Note added duiing press). 



3 Aurivillius, C. W., Studiën über Cirripedien. K. Svensk. Vetensk.-Akad. Handl. XXVI, N° 7, 1894, p. 28—32. 



4 Gruvel. A., Sur quelques Lépadides nouveaux de la collection du British Museum Trans. Linn. Soc. VIII, 8, London, 1902. 



5 Annandale, X., Malaysian Barnacles in the Indian Museum. Memoirs of the Asiatic Society of Bengal. I, 1905, p. So — Si. 

 Preliminary Report on the Indian Stalked Barnacles. Ann. and Mag. Nat. Hist. (7), XVII, April 1906, p. 399. 



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SIBOGA-EXPEDITIE XXXI a. 5 



