PLYMOUTH MAllINE INVERTEBEATE FAUNA. 181 



[ Foraminifera— (Wi^f^. ] 



Lagena quadrata (Williamson) : Williamson, 1858, Eec. For. Gt. Br., 

 p. 11, pi. i, figs. 27, 28 (as Fntosulcnia mar<jinat<i, var. quadrata). 



Present everywhere, but in small numbers. A mere variety of 

 Lagena maryinata. 



Lagena orbignvana (Seguenza) : Brady, 1884, " Challenger " lieport, 

 p. 484, pi. lix, figs. 24-26, etc. 



Cawsand B. ; Drake's I., and generally distributed over the 

 whole district. This is distinctly the most common of the Lagenjc, 

 and is well represented everywhere. The larger specimens are 

 well characterised, but the smaller forms are sometimes extremely 

 difficult to discriminate from Lagena marginata. 



Lagena lagenoides (Williamson): WUliamson, 1858, liec. For. Gt. Br., 



p. 11, pi. i, figs. 25, 26 (as Entosolenia marginata, var. lagciioide.^). 



Generally distributed and present everywhere, but not numerically 

 strong in any dredging. 



Nodosariinse. 



NODOSARIA PYRULA, d'Orbigny : Williamson, 1858, Eec. For. Gt. Br., 

 p. 17, pi. ii, fig. 39. 



Generally distributed, but somewhat scarce, and rarely represented 

 by more than a few chambers of the shell 



NoDOSARiA COMMUNIS, d'Orbigny : Williamson, 1858, liec. For. Gt. Br., 

 p. 18, pi. ii, figs. 40, 41 (as Dcntalina suharcuata). 



Generally distributed, in moderate numbers. The larger specs, 

 are the largest foraminifera of the district ; one in especial, from 

 one mile S.E. of Eddystone, measures 4 mm. in length. 



NoDOSARiA SCALARIS (Batsch) : Williamson, 1858, Eec. For. Gt. Br., 

 p. 15, pi. ii, figs. 36-38 (as N. radicula). 



Drake's I., and generally distributed. Somewhat scarce at 

 places. 



iSToDOSARlA CALOMORPHA, Eeuss : Brady, 1884, " Challenger " Ecport, 

 p. 497, pi. Ixi, figs. 23-27. 



A small species, and very easily overlooked. Brady does not 

 include it in his Synopsis of recent British Species. It is by no 

 means uncommon in this district. 



Ckistellaria crepidula (Fichtel & Moll) : Williamson, 1858, Eec. For. 

 Gt. Br., p. 29, pi. ii, figs. 56, 57 (as C. suhareuatida). 



Drake's 1., and generally distributed in the district ; a common 

 form, but not numerically strong. 



Cristellaria rotulata (Lamarck): Williamson, 1858, Eec. For. Gt. 

 Br., p. 27, pi. ii, figs. 52, 53 [as C. calcar {typiea)]. 



Generally distributed, and somewhat more plentiful than Cristel- 

 laria crepidula. 



Cristellaria vortex (Fichtel & Moll): Brady, 1884, "Challenger" 

 Eeport, p. 548, pi. Ixix, figs. 14-16. 



Brady's only British locality is off the west coast of Scotland, 

 and he states that the specs, are doubtfully referrible to this species. 

 Occasional specs., the characteristics of which are well marked, 

 are found in this district. 



