PLYMOUTH -MAEINE INVERTEBRATE FAUNA. 179 



[ Foraminifera — contd. ] 



BoLiviNA DiLATATA, Keuss : WilHamson, 1858, Eec. For. Gt. Br., p. 76, 

 pi. vi, figs. 164, 165 (as Tcxtuhiria rariahilis, var. sjpif/nilatd). 

 Drake's I., and generally distributed over the district. 

 This species and Bolivina jjundata both flourish on almost any 

 bottom soil and are both happier on genuine muddy silts than 

 most foraminifera. The relative prevalence of the two species 

 obeys some so far undiscoverable law and is subject to wide 

 variations. 



Bolivina .enariensis (Costa): Bradi/, 1884, "Challenger" Eeport, p. 423, 

 pi. liii, figs. 10, 11. 



Drake's I., and generally distributed throughout the district. 

 This is a species which will most probably be overlooked unless 

 the silts are floated. Although common, it is not numerically well 

 represented. 



Cassidulininse. 



Cassidulixa CRASSA, d'Orbigny : WilUamson, 1858, IJec. For. Gt. Br., 

 p. 69, pi. vi, figs. 143, 144 (as C. ohtu.m). 



Drake's I. Universally distributed and fairly numerous every- 

 where. 



Cassidulixa Bradyi, Norman: Brady, 1884, "Challenger" Keport, 

 p. 431, pi. liv, figs. 6-10. 



Distributed over whole district, l)ut distinctly in less numbers 

 than Cassididina crassa. 



Lageninse. 



Lagena globosa (Montagu) : Williamsou, 1858, Kec. For. Gt. Br., p. 8, 

 pi. i, figs. 15, 16 (as Entosolenia). 



A common form of universal occurrence. 



Lagena apiculata, Eeuss: Brady, 1884, " Cliallenger " Eeport, p. 453, 

 pi. Ivi, figs. 15-18. 

 Somewhat rare. 



Lagena botelliformis, Brady : Brady, 1884, " Challenger " Eeport, 

 p. 454, pi. Ivi, fig. 6. 

 Not uncommon. 



Lagena l^evis (Montagu): Williamson, 1858, Eec. For. Gt. Br., p. 4, 

 pl. i, figs. 5, 5a (as Z. vulgaris). 



Present everywhere, but in less numbers than either Laycna 

 orhiynyana, ylohosa, marginata, or probably sulcata. Small specs, 

 with either two or three chambers arranged in nodosarian form 

 are not rare ; some large individuals are entosolenian at one 

 extremity and ectosolenian at the other. 



Lagena glavata (d'Orbigny) : Williamson, 1858, Eec. For. Gt. Br., p. 5, 

 pl. i, fig. 6 (as Z. vulgaris, var. davata). 



Generally distributed, but in considerably less number than 

 Lagena la^vis. 



Lagena gracillima (Seguenza): Brady, 1884, "Challenger" Eeport, 

 p. 456, pl. Ivi, figs. 19-28. 



A not unusual form, has not been found in all dredgings, but 

 probably is very generally distributed. 



