206 Analyses of Books. [March* 



membrane, or pigments of a mulberry colour ; yet the portion 

 obstructed by this pigment is in itself nearly as transparent as 

 flint glass : it is studded over on the interior surface with 

 numerous depressions of a circular form, which, being very 

 closely set together, give it a reticulated appearance. 



" The stemmata are placed between the middle of the com- 

 pound eyes, so as to be rather further from each other than from 

 the eye of the same side. They are not so large as a very 

 minute pin's head, of a lenticular form, perfectly transparent, 

 but not quite colourless, resembUng particles of very pale cairn- 

 gorum quartz. In two instances I have found only one of the 

 stemmata, without any trace of the other. An anomaly some- 

 what of the same kind has been observed by the father of my 

 friend Dr. Ogle, of this University, in the case of a man ; on one 

 side of whose breast the usual rudiments of a mamma were 

 entirely wanting. 



" With respect to the small quantity of light admissible 

 through the cornese of the eyes of the mole-cricket, it is appa- 

 rently sufficient for the purposes of an animal living almost 

 constantly underground. The spherical form of that part of the 

 corneae which is itself incapable of transmitting light is probably 

 intended, as was suggested to me by Mr. Whessel, to whom I 

 am indebted for the principal drawing which accompanies this 

 paper, as a protection for the vertical transparent portion." 



Thorax. An irregularly cylindrical, anteriorly conical, strong 

 horny case, its upper portion and sides covered with fine down, 

 almost entirely occupied by the muscles of the fore-legs, which 

 are attached to an almost bony septum of a complicated form, 

 that divides the cavity longitudinally. 



We pass over the general account of the abdomen to that of 

 its last segment, which sends out from each side of its upper 

 surface two '' caudal antemitz," * asDr. Kidd denominates them, 

 of a tapering form, and differing essentially in structure from 

 those of the head, as they are not jointed, excepting at their 

 very commencement : they are furnished with short closely set 

 hairs, interspersed with long single hairs. They are evidently 

 very sensible, and serve probably to give the animal notice of 

 any annoyance from behind ; they are partially hollow through- 

 out great part of their extent, and muscles may be traced into 

 them from the adjoining part of the abdomen. 



" The Legs. The anterior legs passing out from under the 

 hind part of the thorax, advance by the side of the head in a 

 direction parallel to each other, which is their natural position 

 while the animal is at rest. I should deem it a servile adherence 



• As these organs arecertainly analogous to the cerct of the Blattidte and some other 

 families of insects (though they differ from them in being conical and devoid of joints), 

 that appellation, we conceive, would have been more appropriate than the one Dr. Kidd 

 assigns them. 



