176 DR. F. A. JENTINK. MAMMALS. 



N°. 434. Adult cf. Alkmaar, January 14. 1910 (skin). 

 Young Q; without label (skin with skeleton). 



As a proof of the enormous size that spécimens of Lorentzii can attain when „old" I 

 give hère the measurements of the skull of N°. 310, in mm. 



condulo-basal length 139 nasals, length 55 



condulo-basilar length 135 palatal length 80 



basai length 131 palatilar length 76 



basilar length 127 diastema 26.5 



greatest breadth 60 



Mesosternum with four segments, the fourth being the shortest and broadest ; presternum, 

 feebly keeled, of a spadeform ; xiphisternum not broadening posteriorly, somewhat shorter 

 than the two posterior segments of mesosternum. 



Dactylopsila trivirgata Gray. 



Among the lower javvs of différent Mice and Marsupials from a village at the 

 Pesegem (1500 m.) there are four belonging to Dactylopsila-species, two are smaller and 

 agrée with the lower jaws of Dactylopsila trivirgata; two however are larger, with more 

 sloping incisors, and represent perhaps Dactylopsila melampus O. Thomas. At ail events they 

 show that the genus Dactylopsila is among the animais along the Lorentz-river. Lack of 

 material is the reason why it as yet is impossible, or at least very hazardous, to décide 

 whether this small continental form — so closely agreeing with the type-specimen from the 

 Aru-islands — must be specifically separated or not. Presently I cannot décide to call this 

 small continental animal Dactylopsila Albertisii Peters and Doria, but previously we call it 

 D. trivirgata Gray. 



Pseudochirus Albertisii Peters. 



N c . 325. Old Ç>. Hellwig Mts. (± 1500 m.), October 14. 1909 (skin and skeleton). 



Our spécimen is somewhat larger in ail dimensions than the type-specimen in the 

 Genoa-Museum from the Arfak Mts. ; bearing however in mind that the latter was a non- 

 adult animal, as the figure of its skull clearly shows (Ann. Mus. Civ. Genoa, 1880, pi. IX, 

 fig. 2), there is no reason to doubt of their spécifie identity. Our spécimen agrées absolutely 

 with PETERS' original description in Ann. Mus. Civ. Genoa, 1. c, p. 675. 



The skeleton présents 13 thoracic, 6 lumbar, 3 sacral and 30 caudal vertebrae. Presternum, 

 nearly as long as the two anterior segments of the mesosternum, is spade-shaped and keeled; 

 mesosternum has three segments, rather broad although of the well-known hour-glass form ; 

 xiphisternum, broadest at the anterior end, imperceptibily passes into a broad cartilaginous 

 plate posteriorly. Pelvis reminds very closely the same bony part of Phalanger ; the iliac-part 

 about one and a half the ischium ; thyroid foramen very long and broad ; posterior border of 

 ischium strongly rounded off; tuberosity of ischium very insignificant ; symphysis of pubis 

 short, marsupial-bones very strongly developed, strongly arched and broadly implanted upon 

 the straight anterior border of ischium. 



