24Ö I. r u c k a r t : B flicht über die Leistungen in der IVaturgeschichte 



ceous. Septiil orifice al the extreniily of the shell, single, irregulär 

 in size and form. (Von Groniia Ouj. besonders durch die sandige 

 Besrhaffenhei^ der Schale verschieden.) 



Patellina. Shell free, conical, trochoid, crenulated on ils cn- 

 tire Upper siirface, cotninencing ils gro\vlh as an undivided spiral or- 

 ganism, but soon depcloping cresrentic scgnients, each of which oc- 

 cupics rather more than half t!ie circumference of the shell. Seg- 

 ments arranged in two opposed alternating series. Internal cavities 

 of the Segments nanow, crescentlc ; divided into numerous qiiadran- 

 gular compartmcnls by small calcareous septa prolonged from the 

 peripheral margin and rcaching nearly to the umbilical border, 

 where thcse comparlnients are connected together by a narrow un- 

 divided area. Calcareous layers evtending from the inferior umbi- 

 lical borders of the segments combine lo fill up the coneave infe- 

 rior lateral surface of the shell. Sep(al aperlure uncertain. 



Ehrenberg charakicrisirt (Berl. Monalsber. 1858. 

 S. 14 ff.) folgende neue Polythalamien des Mittelineeres: 



Aristeropora (n.gen.) graeca, A. slickojtora, A. micropora, 

 Ar ist erospira (n. gen.) alluclcnna , A.7 ahna y A. Amatkiae , A. 

 glubularia, A. haloplea , A. isodeima, A. laerigata , A. melo, A. me- 

 dilevranea, A. Menlpeac, A- platypora. A. sparsa, A. tvemalophaena^ 

 A- unthilnla, Aspidospira depressa, Biloculina aegaea, Calcarina uri- 

 steropura , C er a t o sp iruli na (n. gen.) Spraltü^ Cristellaria ro- 

 strala , Etic o ry civ m (n. gen.) nodosa ria , E- terehra, Gvammosto- 

 muin Amphiroae , Gr. Aristolelis , G. asligma, G. Cerberi, G. areni- 

 colttj G. deprcssum, G. littorale . G. Ponti, G. svbstriatttm , G. ? 

 Thüae, Gtitlnlhia? (an n. gen. Cimelidivm) Hoineri, G. armata, No- 

 nionina fusca, N. graecu, PlanuUna? Crisiae, PL? Cgmodoceae, PI. 

 Euridices, PL Forbesü, PL? fusca ^ PL granulata, PL holoplca, PL 

 mesolia, PL Orci. PL spongiaruni, Polymorpliina Aristophatiis, Poly- 

 spira Forbesii , P. Naxi , P. osculala, Pylodexia pusilta, P.? tetra- 

 trias Quinqueloculina? hiriido, liotalia abyssorum , R. bractea , R. 

 crctica^ U. iuverta. Vi. iufentalis, S el eno st omttm (n.gen.) aegaetim, 

 S. fimbriiilum , Spiruluculina tubu ., Sp. ßexiiosa , TrilocuHna aegaea, 

 Vagimila irregnlaris. 



Aristeropora n. gen. E. fynillia Kotalinorum Turbinoidi- 

 bus. Spira in sinistro latere aperta, in dexteo obtecta, sinistro laterc 

 poris pertuso, dextru imperiorato. (= I'orospirae sinistrorsum spirales.) 



Ar ist er OS pir a. R fam. Uotalinorum , sect. Turbinoidnm . 

 Spira in sinistro latere aperta, in dexlra obtecta, ulroque latere poris 

 pertuso. (= i'lauulinae sinistrosiim spirales.) 



Ccrato spir ulina. E Tlicatilium fam. Characteres Quinque- 



