Dr. H. Fol on the Family 'Tintinnodea. 83 
nucleus, situated laterally against the wall of the body, on the 
side opposite to that where the buccal aperture is placed, 
nearly in the middle of the length of the body. 
GenusII. Cyrrarocy.is, auctt. 
Diagn. emend. Test smooth, firm, transparent, composed 
of two lamelle separated by a space at least twice as great as 
the thickness of each of the lamelle. This space is divided 
by very regular septa into a number of small polygonal 
alveoli, which give the test a trellis-like aspect. 
Peristome fringed with undulatory palettes narrower than 
in Tintinnus. 
Cyttarocylis cassis. 
(Dictyocysta cassis, Hack.) 
Several hardened specimens presented an oval nucleus, 
situated about the middle of the length of the body. Fig. 10, 
Pl. IV. shows the edge of the test, with its septa and its two 
lamelle in optical section. The length of the test is 0°22 
millim., and its greatest width 0°132 millim. 
Cyttarocylis cistellula, sp.n. (PI. IV. fig. 8.) 
The test is rounded, ovoid towards the bottom, while the 
upper part widens in the form of a funnel. Upon the edge 
of the funnel there is a membranous portion directed inwards. 
This membranous portion encloses a pretty wide sinus, and 
consists of a very delicate and very flexible membranous outer 
wall, and of an inner wall which forms the continuation of the 
inner lamina of the shell. 
The cells enclosed between the two lamine of the test and 
bounded by the little septa of polygonal form are of nearly 
equal size, except a certain number of cells placed as a zone 
around the widest part of the test, which are three or four 
times as large as the other cells. The small cells (I do not 
employ the word in its histological sense) are, on the average, 
3 # in diameter; the largest ones are as much as 9 w wide. 
The length of the test, ‘including the membranous border, 
attains 0-1 millim. ; its greatest width is 0°07 millim. The 
animal differs but little from that of C. cassis. 
I met with this species at Villafranca, where it was rather 
rare during the winter of 1880-81. 
