1887.] NATURAL SCIENCES OF PHILADELPHIA. 335 



two ureters passed into the urogenital canal, the bladder opening into 

 the latter separately, as did also the vasa deferentia from the testicles. 

 While the anterior extremity of the urogenital canal thus received 

 the openings of the bladder, the ureters and the spermatic ducts, it 

 divided at its posterior extremity into two passage-ways, the posterior 

 of which led into the cloaca, the anterior into the peneal urethra. 



The penis lay next to the wall of the cloaca and was attached thereto 

 by fibrous tissue, the posterior ends being free and unattached to the 

 pelvis. The glands were composed of four mammilloid processes pro- 

 vided with minute papillae. The posterior orifice of the urethra was 

 probably pushed during coition towards the orifice of the spermatic 

 ducts so as to form a continuous canal with the latter, thus prevent- 

 ing the escape of semen into the cloaca. No trace of a mammary 

 gland was found. 



The brain (PI. XIV, 1) differed from that of Or fiith or hynchus in 

 being much convoluted. As regards the corpora quadrigemina, the 

 nates were well developed but the lines of demarcation between them 

 and the testes and between the testes themselves were very obscure. 

 The corpus callosum was developed only in its anterior portion. 

 The thalamus opticus and hippocampus major were remarkably 

 prominent. 



A little spur was present on the calcaneum as in Orinthorhynchus, 

 but the gland and duct with which it communicated were much 

 smaller and placed not so high up on the leg as in the latter. As 

 this spur was j) resent only in the male it may be a sexual appen- 

 dage. The animal had been observed by Mr. A. E. Brown, the 

 superintendent of the garden, to clean its spines by means of its 

 hind limbs, and the secretion of oil from the gland which is dis- 

 charged through the spur may merely assist in this process. 



November 1, 1887. 



Mr. John H. Redfield, in the chair. 



Twenty-seven persons jDresent. 



The death of Frederick Graf Marshall, a correspondent, was 

 announced. 



Note on the Sense of Direction in a European Ant, Formica 

 rufa. Dr. Henry C. McCook remarked that during the summer he 

 had made an observation upon the well known "horse ant", or 



