ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
213 
rather more than one-third the size of the body ; the lorica is egg-shaped, 
and the ventral plate is small and flat. 
Sense of Vision in Rotifers.* — Mr. C. Rousselet describes the way 
in which Pedalion escapes from a pipette, and suggests that it can see 
close objects, and is not merely affected by light and shade. It is pro- 
bablo that many other Rotifers can perceive a distinct image, especially 
those whose eyes are exactly similar in structure to those of Pedalion. 
Two Male Rotifers hitherto undescribed.f — Mr. G. Western found 
the male of Notops clavulatus in a gathering from Richmond Park ; the 
average length was 1/140 in. and the general contour is that of the 
female ; the male of Trijohylus lacustris, which is a reproduction in minia- 
ture of the form of the female, was found at Chingford ; the average 
length was 1/83 in. ; the females taken on the same occasion were much 
larger than usual. 
Two Rotifers from Epping Forest.J — Mr. F. A. Parsons describes 
two forms which appear to be new. Callldina magna -calcarata, and 
Pterodina caeca ; both live commensally on Asellus. The former is most 
conspicuous by the presence of two large spurs, and is most like 
C. socialis ; the latter is minute and elegant, and, as its specific name 
implies, appears to be without eyes. 
Salinella — a new Mesozoon.§ — Dr. J. Frenzel describes Salinclla 
salve g. et sp. n., a remarkable Infusorian-like multicellular organism 
which he found in salt solutions at Cordoba in Argentina. The 
normal length of the animal is ’IS-' 22 mm.; it is sac-like in shape, 
like many Turbellarians ; both ends are rounded off ; there is a dorso- 
veutral flattening. The organism is multicellular, but has only a 
single layer of cells. The ventral surface is finely ciliated ; the back 
and sides bear short bristles. The mouth lies anteriorly, subtcrminally 
and ventrally, and bears strong cirri ; the anus is terminal and bears 
stiff bristles. The internal cavity is lined by long cilia. Reproduc- 
tion occurs by transverse division, and there is also encystatiou pre- 
ceded by conjugation. The young larval form is unicellular. 
As to the life of this strange organism, it occurred in an aquarium 
in which salt from native brine deposits was dissolved ; it fed on 
debris caught up by the oral cirri ; digestion and absorption, aided 
perhaps by numerous bacteria, occurred within its cavity. The move- 
ments were somewhat worm-like and referable to the contractility 
retained by all the cells. During growth, the cells divide in an ami- 
totic fashion, but not by “ direct ” nuclear division. The unicellular 
larva feeds like a Protozoon, and its first divisions are almost, if not 
quite, mitotic. 
Echinodermata. 
Ludwig’s Echinodermata. || — Prof. II. Ludwig has completed the 
first volume of his work on Echinoderms, and now brings to an end 
* Journ. Quek. MW. Club, iv. (1892) pp. 371-3 and 370-7. 
t Tom. cit., pp. 374-5 (8 figs ). f Tom. cit., 378-80 (5 figs.). 
§ Archiv f. Nuturgesch., lviii. (1892) pp. 06-90 (1 pi. and 4 figs.). 
|1 Bronn’s ‘ Klassen u. Ordnuugen,’ II. 3. Echinodermen, parts 15 and 10, pp. 377- 
460 and vi. 
