Wissenschaftliche Ergebnisse der Deutschen Tiefsee Expedition auf dem Dampfer "Valdivia" 1898-1899. Elfter Band. Die Xenophyophoren, eine besonder Gruppe der Rhizopoden und Die Tetraxonia.

Jena, Gustav Fisher, 1905-1907. Two parts in one. Large 4to (33.3 x 24.6 cm). Title page, 373 pp. 46 (partly chromo-) lithographed or photographic plates. Later 20th-century half cloth over pattered boards. Gilt title on the spine. A seldom seen work, principally by the German zoologist, and founder of the zoology department of the university of Rostock, Franz Eilhard Schulze (1840-1924). "Xenophyophores are multinucleate unicellular organisms found on the ocean floor throughout the world's oceans, at depths of 500 to 10,600 metres (1,600 to 34,800 ft). They are a kind of foraminiferan that extract minerals from their surroundings and use them to form an exoskeleton known as a test. They were first described by Henry Bowman Brady in 1883. They are abundant on abyssal plains, and in some regions are the dominant species. Fourteen genera and approximately 60 species have been described, varying widely in size. The largest, Syringammina fragilissima, is among the largest known coenocytes, reaching up to 20 centimetres (8 inch) in diameter" (Wikipedia). This is the complete Volume eleven. Stamp and date-stamp on title pages and on verso title pages. Original orange printed front wrapper of Ppart 1, as well as the title and contents leaf to Volume 11, preserved and bound in. Excellent condition.