110 W. ARCHER. 



figure, it is possible we may justly enough regard the form 

 here drawn attention to as specifically distinct from that of 

 Claparede and Lachmann ; but for the present I would not 

 venture to pronounce any more decided opinion ; it is quite 

 possible it will be refound in the future by other better 

 judges. 



Pyxidicula operculata (Ehx .^, = Arcella patens (Clap, et 

 Lachm.^) Carter.2 



This rhizopod, as described by Hertwig and Lesser, is 

 furnished with a test, dorsally, of the form of a highly con- 

 vex watch-glass, curved inwards below at the periphery all 

 round, so as to leave a median pseudopodial opening ; its 

 colour of a brownish yellow, though sometimes colourless, 

 and covered externally by irregularly scattered, very minute 

 roughnesses (" von unregelmassig vertheilten feinsten Hoc- 

 kerchen bedeckt"); the pseudopodia (seldom, however, show- 

 ing themselves) are conical, like those of an Arcella; one 

 evident nucleus and a few contractile vacuoles are present. 



This form I do not myself as yet know; its separation 

 generically from Pseudochlamys patella seems to be based 

 on its external " Hockerchen " or granulations as compared 

 to the " shagreening " or scrobiculi (?) of the latter. 



HyalospJienia lata, Eilh. Schulze^ (PI. VIII, fig. 5). 



Under the above name a lobose Monothalamian sarcodine 

 is recorded by Professor E. Schulze, which he relegates to a 

 genus founded by Stein for a form discovered by him near 

 Prague. There appears to be no figure extant of Stein's 

 original species, HyalospJienia cuneata. Stein. It is thus 

 described^ (as quoted by Schulze) : " Test oval, much flat- 

 tened in front in a cuneiform manner, truncate at the frontal 

 end, without lip-like margins, everywhere glassy, pellucid, 

 and colourless, without any trace of polygonal impressions. 

 From the narrow opening always but a single finger-like 

 pseudopodium is piojected. The animal can abruptly and 

 quickly become retracted to the bottom of the test, whereby 

 all connection with the orifice of the test is done away with." 



The foregoing is sufficiently vague, both as regards the 

 form of the test or the nature of the body. Assuming it to 



^ Claparede and Lachmann, ' Etudes,' &e., p. 446. 

 2 Carter, 'Ann. Nat. Hist.,' vol. iii, p. 31. 



» Schulze, in ' Schultze's Archiv f. Mikr. Anatomic,' Bd. XI, p. 335, t. 

 xviii, f. 15—18. 

 ■• Stein, ' Sitzuugsberichte der Wissench.,' Jan., 1875. 



