PLYMOUTH MARINE INVERTEBRATE FAUNA. 177 



[ Foraminifera — contiL ] 



Trochammina inflata (Montagu): Williamson, Eec. For. Gt. Br., p. 50, 



pi. iv, figs. 93, 94 (as Iloffdina). 



Distributed much like Jfaplophrafjmiiim cannricnse, which in 

 some esLuarine waters it largely replaces ; it also occurs, however, 

 well outside the 30-fathom line. 



Textularinse, 



Textularia SA(iiTTULA, Defrance : Bradi/, 1884, " Challenger " Eeport, 

 p. 361, pi. xlii, figs. 17, 18. 



The difficulty of precisely defining the limits of each species of 

 the arenaceous textularia on these grounds is almost insuperable. 

 Tcxtubiria sagittnUt is one of the less frequent forms, but it may 

 occur anywhere where either gramcii or agghdinans is found. The 

 most typical specimens are found in estuarine waters. 



Textularia trochus, d'Orbigny : Williamson, 1858, Eec. For. G t. Br., 

 p. 75, pi. vi, figs. 160, 161 (as T. cuneiformis, var. conica). 



This form, like the last, is infrequent, but while some specimens 

 of sagittula may be divided from agglvtinans by fairly marked 

 features, trochus, if it really occurs on these grounds, is always 

 most suspiciously like a somewhat unorthodox gramcn. 



Textularia agglutinans, d'Orbigny : Brady, 1884, " Challenger " 

 Eeport, p. 363, pi. xliii, figs. 1-3. 



Even between TcMidaria a ggl id in mis and Tcdtdaria gramcn there 

 may arise difficulties of discrimination. Tc.didaria aggbdiuans is 

 everywhere the less common, but is generally distributed, and follows 

 gramen in its preference of localities. 



Textularia agglutinans, Yox.porrecta, Brady : i/r«f/7/,1884,"Challenger" 

 Eeport, p. 364, pi. xliii, fig. 4. 



This variety is occasionally found in all parts of the district. 



Textularia gkamen, d'Orbigny : Brady, 1884, " Challenger " Eeport, 

 p. 365, pi. xliii, figs. 9, 10. 



Cawsand B. ; Drake's I. ; and the district generally. 



Textularia gramcn is much the most common of the Textularia; 

 it frequently rises to from third to fifth in numerical order of the 

 foraminifera taken in a dredging, and on the eastern slope of the 

 Hand Deeps at one station it is only excelled by Mdiolina 

 seminulum. 



Verneuilina roLYSTRoriiA (Eeuss): Williainson, 1858, Eec. For. Gt. Br,, 

 p. 65, pi. V, figs. 136, 137 [as Bulimina scahra (arenacea)]. 



Drake's I. ; also sparingly present throughout the district, but 

 this species shows a preference for shallow water. In estuaries it 

 sometimes practically re})laces the Textularia. 



Bulimininae. 



Bulimina puroides, d'Orbigny : Williamson, 1858, Eec. For. Gt. Br., 

 p. 62, pi. V, figs. 124, 125. 



Drake's I. A connnon species throughout the district, a little 

 more plentiful within than without the 25-fathoui line. 



