70 



Schema 5. Der Drüsenapparat bei Halobates ßavwentris var. 

 Kudrini (von Prof. N. Nassonow^ beschrieben). Die einzelnen Säcke 

 und ihre Öffnungen sind verschmolzen und nur die specialen Driisen- 

 abtheilungen unvereinigt geblieben. 



Schema 6. Der Drüsenapparat ^&t Pentatoma nigricornis. Paarig 

 blieben nur Ausführungscanäle und die Öffnungen ; die Säcke und 

 ihre Drüsenabtheilungen sind verschmolzen. 



Schema 7. Der Duftapparat von Cimex lectularius. Nur die spe- 

 ciellen Drüsenabtheilungen sind ganz verschmolzen. 



Meine Arbeit wurde im Zool. Laborat. der Warschauer Universität 

 unter der Leitung Professor Nassonow's ausgeführt, und wird in 

 ihrem ganzen Umfange in »Arbeiten« dieses Laboratoriums für das 

 Jahr 1897 gedruckt werden. 



Warschau, 10./22. December 1897. 



8. Dîd Millepora occur in Tertiary Times'? 



By Professor Sydney J. Hick son, Manchester. 



eingeg. 3. Januar 1898. 



I have for some time been endeavouring to obtain fossil specimens 

 of the genus Millepora to compare with the species from recent coral 

 reefs, and after much patient search and considerable correspondence 

 with distinguished palaeontologists, I have failed. 



The genus Millepora is an isolated one among living corals — 

 the patent dimorphism of the pores, the well defined tabulae and the 

 general character of the canal system are features which, taken to- 

 gether, clearly and definitely distinguish it from all other genera. In 

 several Museums I have found fossil corals from tertiary deposits la- 

 belled Millepora^ but in no one of these have I been able to distinguish 

 the feature of dimorphism of the pores, and in other respects the affi- 

 nities with Millepora appear doubtful. I have carefully examined spe- 

 cimens 0Î Axopora (Edw. a. H.), and PorospJiaera (Steinm.), the two 

 genera of fossils which are most usually confounded with Millepora, 

 with the result that I feel doubtful whether we are justified in includ- 

 ing them even in the Order Hydrocorallinae. They are most certainly 

 not allied to the living genus Millepora. 



On referring to the literature of the subject I can find no descri- 

 ption nor figure of a fossil which proves the existence of Millepora in 

 tertiary times. The conclusion I have arrived at then is that there is 



^ N.Nassonow, Halobates flaviventrisyar. Kicdrini hoy. var. Entomologische 

 Studien. 1893. (Russisch.) 



