406 Mr. Templeton on certain Spiders. 
The necessity of separating this genus from the preceding, to which it 
is very closely allied, can admit of no doubt. In the first place, its form 
is exceedingly dissimilar, as will be apparent from a comparison of their 
profiles, that of Dysdera being very elongate and cylindric, this short 
and globose as in Theridion or Epéira, and the peduncle very far along its 
inferior surface. The cephalothorax is also in this nearly rhomboidal, 
the opposite sides being very nearly parallel, and the angle by which the 
anterior recedes being very acute, while Dysdera is far from presenting 
such a form, and the anterior superior angle is nearly a right one. The 
eyes here also differ from those of every other genus, the large ones in the 
centre and the lateral pairs being all oval*: not however perfectly regular, 
the inner edges of the larger being nearly straight and their breadth being 
diminished disproportionately anteriorly ; the lateral ones are much more 
nearly perfectly oval but they differ slightly anteriorly. In the palpi the 
greatest discrepancy occurs, andI know of no other genus in which the 
hairs are serrated. The parts of the mouth are also unlike Dysdera. 
When the Spider is examined alive its blood + is perfectly transparent, 
* Though these eyes assume this singular form, to suit perhaps the economy 
of the animal, it is obvious that the surface must be part of the same solid of 
revolution, else distinct vision would not be practicable: this is a curious 
circumstance, and leads to the enquiry of how the surface becomes modified in 
the compound eyes of Lamia, Saperda, &c. 
+ I know no more beautiful and interesting object, than the circulation of 
the blood in the Spider presents under the microscope. It is much more dis- 
tinctly seen in Clubiona atrox than in any other species I have yet examined, 
from the circumstance that the particles or globules of the blood are very 
opaque and therefore more distinctly observable. Tosee the motion in the legs 
the age of the specimen matters not, but if the entire circulation be the subject 
of investigation it is better to take the young, the central dorsal macula alone 
being then distinctly marked. The mode I pursue, and which I recommend 
for the adoption of others, consists in placing the Spider under water between 
two plates of glass with a ring or twoof card interposed of sufficient thickness 
to prevent its being much compressed: the animal is thus prevented from strug- 
gling, and as sufficient air remains in and about the pulmonary sacs to afford 
an adequate supply of oxygen to it, it does not seem to suffer from the confine- 
ment in water. By throwing the light of the reflector up, the circulation of 
