Siboga-expeditie; Uitkomsten op zoölogisch, botanisch, oceanographisch en geologisch gebied verzameld in Nederlandsch Oost-Indië, 1899-1900, aan boord ... onder commando van G. F. Tydeman Volume 9

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...beginning their development as a small black spot situated near the apex, but we find it more in the neighbourhood of the crest than of the apex of the tentillum. This shows probably that the tentillum is not a full-grown one. The "bourrelet de nematocystes" in Bedot's Erenna Richardi is the proximal part of the granulated crest, which does not stand in connection with the entodermal canal of the middle-part. In our largest tentillum we find it on the contrary near the basal part; near the peduncle of the tentillum. Perhaps such another "bourrelet" is being developed in later stages. Microscopical sections have been made but the material is unfortunately absolutely insufficient, the different layers being all destroyed. We can therefore give no further description of the very interesting entodermal canals and paired organs which Bedot describes, nor of the "cellules transparentes" and the relation all these layers bear one to another. However incomplete the description of these tentilla is, there exists undeniably the closest relationship between the tentacles and tentilla of Erenna Richardi and Erenna Bedoti. The resemblance of the tentacles of these two to those in the new species, Bathyphysa Sibogae, is also a striking one (compare PI. XI, fig. 88 and PI. XXIII, fig. 163). Finally we give as ketch of a mature bract, which whilst examining the specimen, became detached. It has a length of 18 mm., a breadth of 2l/% mm. (PI. XI, fig. 90). It can be divided into two distinct parts, the basal one which is excavated and rounded anteriorly, the proximal one which arises somewhat higher and finishes gradually in a blunt point. This second part shows a small indentation which is probably also situated on the other...