UNIVERSITY OF CALIFORNIA PUBLICATIONS 



ZOOLOGY 



Vol. 16, No. 5, pp. 63-69, 8 figures in text December 1, 19 IS-^*"^ In«f/*ii7?\ 



^'^ DEC 30 1915 



NOTES ON THE TINTINNOINA 



1. ON THE PROBABLE ORIGIN OF DIVTYOVYSTA TIARA 

 HAECKEL 



2. ON PETALOTRICHA EXTZI SP. NOV. 



BY 



CHARLES .\TWOOD KOFOID 



1. ON THE PROBABLE ORIGIN OF DK'TYOCYSTA TIARA 

 HAECKEL 



We owe to Professor Ernst. Ilaeckel (1873) our first adequate 

 information regarding the structure and relationships of those minute 

 protozoans of the high seas known as the Tintinnoina, which build 

 for themselv&s beautiful va.se- or bell-shaped houses or loricae of 

 delicate texture, elaborate patterns, and wide range of form. Among 

 the species which he described was one from off Lanzerotte, in the 

 Canary Islands, which because of its mitre-like structure he named 

 Dictyocysta tiara. He published (1873, pi. 27, fig. 7) a figure of this 

 species drawn in the flowing lines for which his facile hand is famous. 

 We have reproduced this in our text-figure 1. The noteworthy fea- 

 tures of this species as compared with those of all others described in 

 Dictyocysta are the marked zone of contraction at the base of the oral 

 fenestrae, and the very much contracted aboral region. There is less 

 of this suboral constriction in other species of Dictyocysta, and none 

 has the pointed tapering aboral end, but rather a hemispherical or at 

 most convex-subconical one. 



Since Haeckel's (1873) discovery of this species no one has seen 

 it, although Cleve (1901) ransacked hundreds of samples from the 

 .surface waters of the tropical and semitropical Atlantic and Brandt 

 (1906, 1907) and Laackmann (1910) have monographed the group 

 with extensive collections from these regions. 



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