6 Prof. T. Thorell on the 



appear to form a transition, though a very indistinct one, to 

 Thelyphonus and Phrynus. For mj part I am more inclined, 

 with Gervais, to consider the Androctonini the most highly- 

 developed scorpions, in virtue of their more nimierous eyes, 

 more developed pectoral combs, and richer tooth armature of 

 the fingers both of the mandibles and the palpi, their powerful 

 tail, &c. At least the Androctonini are the most typical of 

 scorpions ; and with them therefore I begin my arrangement. 

 The Pandinini, which differ most from the Androctonini^ 

 have on that account received the lowest place*. 



Ordo ScORPiONES (sive Scorpii). 

 Fam. I. Androctonoidse. 



Sternum narrowing forwards, subtriangular. Intermediate 

 lamella of the pectoral combs rather few in number, most of 

 them angular and larger than the fulcra, and forming only one 

 series. The movable finger of the mandibles (which always 

 forms a perfect furca) has two rows of teeth ; their immovable 

 finger has two teeth in the superior margin, 2-0 in the inferior. 

 The fingers of the palpi are, along the middle of their edge, 

 provided with a number of oblique rows of fine teeth, and on 

 either side of these with other, generally coarser teeth, arranged 

 in one or more rows. Three principal lateral eyes and 2-0 

 accessory eyes on each side of the cephalothorax. 



Subfam. 1. Andmoctonini. 

 Not only the upper but also the under margin of the im- 

 movable mandibular finger armed with tioo strong teeth. 

 Lateral teeth of the palp-fingers, which are coarser than the 

 median teeth, form along the inner side a single simple row ; 



* The place that I consider the order of Scorpions to occupy in the 

 class of Arachnoidea will appear by the following scheme : — 



Class Abachnoidea. 



Subcl. 1. Thoeacopoda, nob. 

 Ordo 1. Scorpiones, Ordo 5, Solifugae. 



2. Pedipalpi. Ordo 3. Aranese. 



6. Pseudoscorpiones. 4. Opiliones, 



7. Acari. 



8. Linguatulina (=fam. Pentastomoidee). 



Subcl. 2. (Ordo 9) Cormopoda, nob. (=fam. Arctiscoida). 



rrhe usual name of the last order, " Tardigrada," belongs to a group 

 of Mammals. The order Pantopoda (fam. Pycnogonoidcs) appears to be 

 more nearly allied to the Crustacea than to the Arachnoidea.] 



