FEOM THE ENGLISH LAKE DISTRICT. 367 



CoRYTHiON DUBIUM, Tavcinek, ' AIonograjMe der Aeheliden Bohmens, 4'c./ 

 p. 43 ; Penard, ' Faune rliizoi^odique Sfc.,'' p. 531. (Plate 50. figs. 13 

 & 13 a.) 



This species seems to be generally overlooked or confused with Trinema 

 enchelys, from which, however, it differs in the construction of the test. This 

 consists of narrow oval plates somewhat irregularly arranged and difficult to 

 see; while in T. enchelys the plates are round, and, at any rate in the larger 

 forms, of two sizes, the intervals between the larger ones being filled up by 

 the smaller ones, giving the characteristic beaded appearance to the margins 

 of these plates. 



Size 32 /i X 22 ^l. 



Paulinella chromatophoea, Lauterborn, ^Protozoenstudien,'' in ' ZeitscJir. 

 f. iviss. Zool.,' Bd. 59, 1895, p. 537 ; Penard, ^ Revue Suisse deiZool.,^ 1905. 

 "(Plate 50. figs. 14 & 15.) 



This species has been reported from Loch Ness in Scotland (a single 

 individual), but, so far as I have been able to discover, not from this country 

 previously. It occurs in Highlow Tarn, but all the individuals I found were 

 empty tests. These, however, correspond with Penard's description. The 

 test is regular and oval in shape, terminating in a short collar surrounding 

 the elliptical mouth ; it is formed of five longitudinal rows of rectangular 

 plates with rounded ends, there being about 12 plates in each row, placed in 

 alternating series. 



Size : from 27 to 32 yu, long and from 20 to 23 /j, broad. 



I wish to express my thanks to Mr. J. Hopkinson, F.L.S., to whom I am 

 indebted for much help and advice while revising this paper for publication ; 

 and to Dr. E. Penard, of Geneva, whose ready assistance is greatly 

 appreciated. 



Literature. 



1905. Cash, J., and Hopkinson, J. — The British Freshwater Rhizopoda and 

 Heliozoa. Vol. I. Ray Society. 



1909. — , — Vol. n. 



1895. Lauterborn, R. — " Protozoenstudien,^-' in Zeitschr. f. wiss. Zool., 



Bd. 59. 

 1879. LeidYj J. — Freshwater Phizopods of North America. 

 1905. Murray, J. — The Phizopods and Heliozoa of Loch Ness. P. P. Soc. 



Edin. XXV. 

 1890. Penard, E. — " Etudes sur les Phizopodes d'eau douce," in Mem. Soc. 



phys. et hist. nat. Greneve. 



1902. Faune rhizopodique du bassin du Leman. Geneve. 



1905. " Sur les Sarcodines du Loch Ness,''^ in P. R. Soc. Edin. xxv. 



1905. "Notes sur quelques Sarcodines," in Revue Suisse de Zool. 



linn. JOURN. ZOOLOGY, VOL. XXX. 29 



