152 



ceoHS. Septal orifice at the exlieitiity of the shell, single, irregulär 

 in sizc anil form. (Von Gromia Duj. besonders durch die sandige 

 Beschaü'enheit der Schale verschieden.) 



Patellma. Shell free, conical, trochoid, crenulated on iJs en- 

 tii'e Upper siirface, commencing its growth as an undivided spiral or- 

 ganism, but soon depeloping crescentic segments, each of which oc- 

 cupies rather more than half the circuniference of the shell. Seg- 

 ments arranged in Iwo opposed alternating series. Internal cavities 

 of the Segments narrow, crescentic ; divided into numerous quadrau- 

 gular compartmenls by sniall calcareous septa prolonged from the 

 peripheral niargin and reaching nearly to the umbilical border, 

 where these coinpartnients are connected together by a narrow un- 

 divided area. Calcareous layers e\tending from the inferior umbi- 

 lical borders of the segments combine to fill up the concave infe- 

 rior lateral siirface of the shell. Septal aperture uncertain. 



Ehren berg charakterisirt (Berl. Monalsber. 1858. 

 S. 14 ff.) folgende neue Polylhalamien des Miltelineeres : 



Arisleropora (n. gen.) (jraeca, A. stickopora, Ä. micropora, 

 Ar i s t er s p ira (n. gen.) allocierma , A.? alma, A. Amathiae , Ä. 

 globularia, A. haloplea , A. isoderma, A- laevigata , A. melo, A. me- 

 diterranea, A. Menipeae^ A- platypora, A. spnrsa, A. tremalophaena, 

 A- undulala, Aspidospira dcprcssa, Biloculina aegaea, Calcarina uri- 

 steropora , C er a t o sp irul i na (n. gen.) Spratlii, Cristellaria ro- 

 strala, Eucorycium (n. gen.) nodosaria , E. terehra, Grammosto- 

 niutn Amphiroae , Gr. Arislolelis , G. asligma, G. Cerberi , G. areni- 

 eola, G. depressvm, G. littorale. G. Ponti, G. svbstrialiim , G.? 



Tlioae, Gtittiilhia? (an n. gen. Cimeli dium) Homeri, G. arniala, No- 

 nionina fusca, N. graeca, Planulina? Crisiae, Fl.? Cymodoceae, PI. 

 Euridices , PL Forbesii, PL? fusca, PL granulala, PL holoplea, PL 

 mesolia, PL Orci, PL spongiarum, Pohjmorphina ArislophaHis, Poly- 

 spira Forbesii , F. Naxi , F. oscvlata, Pylodexia ptisilla, F. ? tetra- 

 trias Quinqueloctilina? hirndo , llotalia abyssorum . R. bractea , R. 



crctica, R.incerta,R. infernalis, S eleno st omum (n. gen.) aegaetim, 

 S. fimbriatum, Spiroloculina tuba , Sp. ßexuosa , Trilocidina aegaea, 



Vaginula irregvlaris. 



Arisleropora n. gen. E. faniilia Kotalinorum Turbinoidi- 

 bus. Spira in sinistro latere aperta, in dextio obtecta, sinistro latere 

 poris pertuso, dextro imperforato. (= Porospirae sinistrorsum spirales.) 



Aristerospira. E fam. Rotalinorum , sect. Turbinoidum. 

 Spira in sinistro latere aperta, in dexlia oblccta, utroque latere poris 

 pertuso. (= l'Ianulinae sinistrosum spirales.) 



C er ato spir ulina. E Tlicatilium fam. Characteres Quinque- 



