1902.] NATURAL SCIENCES OF PHILADELPHIA, 245 



laris which is very large. The flexor subliinus digitorum and 

 pahnaris longiis act together iu Galeopithecm and Chiroptera, as is 

 also the case in the hedgehog. The phalanges supporting the 

 claws in Galeopithecus are supplied by the extensor digitorum com- 

 munis and extensor pollicis longus, the middle and first phalanges 

 by the extensor digiti secundus, iudicis, and pollicis brevis. The 

 origin of the psoas major is shorter in Galeopithecus and Pteropus 

 than iu insectivores and lemurs. The disposition of the tensor 

 fasciae latse, glutseus maximus, and femoro-coccygus muscles are 

 the same in Galeopithecus, Chiroptera and Chrysochloris among the 

 Insectivora. The sartorius, though present in Galeopithecus, 

 Tupaia and lemurs, is absent in Chiroptera, and the gracilis, while 

 double in Galeopithectcs and some Insectivora, is single in Chirop- 

 tera. The biceps is rudimentary in Galeoj)ithecus and absent 

 altogether in Chiroptera. The soleus and plantaris are absent in 

 Galeopithecus and Chiroptera, though both these muscles are pres- 

 ent in Lemuroidea. The plantaris is, however, absent in Tupaia. 

 An extensor brevis digiti quinti appears to be present in Galeopithe- 

 cus, as is also the case in the Chiroptera, and Loris gracilis among 

 the Lemuroidea. 



Nervous System, 



The brain of Galeopithecus having been described and figured by 

 Gervais* and Leche,^ the author has but little to add to their 

 descriptions. The most striking feature externally in the brain of 

 the specimen examined by the author, as also noticed by the ob- 

 servers just mentioned, is the almost complete absence of the occipi- 

 tal and temporal lobes, they being so little developed that only the 

 anterior part of the nates are covered by the hemispheres. The 

 olfactory lobes are well developed, and but slightly covered by the 

 cerebral hemispheres ; their slender tracts expand posteriorily into 

 the hippocampal uncinated gyrus. On the lateral surface of the 

 brain the hippocampal gyrus is separated from the rest of the bi-aiu 

 by a deep sulcus, from the anterior end of which proceeds upward 

 a fissure, the so-called principal fissure (Pansch). The doi*sal 

 surface of the brain is farrowed by two pai-allel sulci, the external 

 one very deep, corresponding, probably, to the interparietal 

 sulcus, the internal much more superficial. 



» Journal de Zooloyie, T. 1, 1872, p. 445, PI. 31, fig. 5. 

 9 Op. cit., p. 48, fig. 29-32, 



