IN THE LOWER TERTIARY STRATA OE NEW ZEALAND. 225 



Summary of the Genera and Species of Monactinellid Sponges 

 represented in the Oamaru Deposit. 



We give below a list o£ the genera, and an approximate 

 estimate of the number of species in each, which appear to be 

 represented by the detached spicules referred to in detail in the 

 preceding pages. With one or two exceptions the genera are 

 arranged according to the classification of Eidley and Dendy in 

 their ' Challenger' Eeport and of Vosmaer in the Monograph on 

 the Porifera in Bronn's ' Klass, u. Ordn. des Thierreichs.' 



Division MONACTINELLIDJE, Zittel. 

 Group Halichondrina, Vosmaer. 



Family HoMORRHAPniD^, Bidley Sf Dendy. 



No. of „ Flesh- Skeleton- 



Species. (^m\x5. Spicules. Spicules. 



(?) Beniera (?), Nardo S.S. 



(?) Chalina (?), Grant S.S. 



Family Desmacidonid^. 



2 Forcepia, Carter F.S. & S.S. 



1 Acarnus, Gray F.S. & S.S. 



3 Hamacantha, Gray F.S. & S.S. 



10 Esperella, Vosmaer {=Esperia, Nardo). F.S. & S.S. 



4 Fsperiopsis, Carter F.S. & S.S. 



1 Cladorhiza, Sars F.S. & S.S. 



4 Chondrocladia, Wyv. Thomson F.S. & S.S. 



,o J Desmacidon, Bowerbank F.S. & S.S. 



t Myxilla, Osc. Schmidt F.S. & S.S. 



1 lophon, Gray F.S. & S.S. 



1 Amphilectus, Vosmaer F.S. & S.S. 



2 Guitarra, Carter F.S. & S.S. 



1 Melonanchora, Carter F.S. & S.S. 



4 Pseudohalichondria, Carter F.S. & S.S. 



2 Plocamia, Osc. Schmidt S.S. 



Family Axinellidj!, Bidley 6f Dendy. 



(?) Axinella (?), Osc. Schmidt S.S. 



(?) Hymerhaphia (?), Bowerbank S.S. 



LINN. JOURN. — ZOOLOGY, VOL. XXIV. 16 



