306 HeiT J. Wagner on the 



the last segment was separated from the remainder by a 

 transverse groove. On the anterior border of the cephalo- 

 thorax were situated the median eyes, and on the sides of the 

 same region the lateral ones. The chelicerse placed in front 

 of the mouth were feebly developed ; the long pedipalpi 

 served the creature for seizing its prey ; the iirst segments of 

 the pedipalpi and of the legs possessed masticatory processes, 

 which bounded the oral aperture on both sides and behind. 

 The last pair of legs served partly for swimming. The six 

 anterior segments of the abdomen, which were provided witli 

 laraelliform appendages, were broader than the remainder, 

 but the transition from the one group to the other was gradual ; 

 the last segment was expanded and ran out into a point. 

 Among the abdominal appendages the first pair was very 

 feebly developed, while the following pairs concealed small 

 depressions, which were situated upon the ventral surface of 

 the abdomen ; into these depressions projected thin-walled 

 branchial processes, proceeding from the surface of the ap- 

 pendages turned towards the abdomen. Upon the surface of 

 the body, the last abdominal segment also not excepted, 

 opened numerous unicellular dermal glands; in the cephalo- 

 thorax these glands were united into groups, and possessed 

 fairly long thin-walled excretory ducts ; a pair of these glands 

 at the base of the pedipalpi was especially strongly developed, 

 and poured out a secretion which assisted in the process of 

 digestion. Three pairs of strongly developed coxal glands 

 were present and opened at the base of the first, second, and 

 third pairs of legs. The genital aperture was situated between 

 the appendages of the first abdominal segment. The form of 

 the metastoma was cordate. The nervous system was 

 suggestive of that of the Scorpion ; the ganglion of the last 

 pair of legs was probably not fused with the oesophageal 

 ganglion ; the ganglia of the chelicerjfi, partly also those of 

 the pedipalpi, were situated on both sides of the oesophagus, 

 so that the oesophageal commissures, just as in the existing 

 Arachnids, were not developed. The development of the 

 blood-vascular system was approximately the same as that in 

 Scorpio ; the anterior extremity of the many-chambered heart 

 extended into tiie cephalothorax ; the anterior aorta formed 

 numerous ramifications beneath the external covering of tiie 

 cephalothorax ; in the abdomen the branciiial vessels were 

 strongly developed. The mid-gut was divided into numerous 

 paired lobes, the anterior of which extended into the ap- 

 pendages; two small evaginations, proceeding from the 

 hinder end of the mid-gut, served partly as excretory organs. 

 The end-gut was a short and simple tube devoid of expan- 



