199 



Facial Vihrissae (see fig. 2). — The mysticial set consists of a few irregular 

 vibrissae which do not arise in any recognizably ordered manner. Most of the 

 individual bristles are not straight, as such sensory vibrissae usually are, but 

 are waved in direction. Two supra-orbital bristles are present. The sub-mentals 

 and interramals soon lose their identity and merge with the general coarse body 

 hairs. The genals are represented by a tuft of about half a dozen black bristles 

 which are inconspicuous in older embryos. No facial vibrissae have any definite 

 papillae of origin. 



Brachial Vihrissae. — The ulnar carpal papilla is the only one present, and 

 it remains fairly well marked during dependent life. Four vibrissae spring from 

 it, but with the development of hair on the forearm the individuality of the 

 bristles becomes lost. 



Rhinariuni. — The muzzle region is one of the most interesting features of 

 the young Numbat. The 23 mm. R.V. specimen (full face, fig. 3; side face, 

 fig. 2) shows a perfectly circular mouth, and above it the nasal process as a 











•^m 



*-S" 



Fig. 8. 



Myrmecobius fasciatus. 



Mammary area of a female specimen 75 mm. 



maximum H.B. length. 



flattened ridge. Upon either side of the nasal process are the maxillary pro- 

 cesses completing the maxillary portion of the mouth. Surrounding these pro- 

 cesses is a wide roll of skin of the muzzle, separated from the rest of the skin 

 of the face by a deep furrow limiting it posteriorly; another furrow marking 

 it off from the nasal process. The rhinariuni is strikingly retreated and the 

 mandibular portion of the face is considerably in advance of the maxillary 

 portion. The site of the anterior nares is at the lateral margin of the simple 

 nasal process. In the 45 mm. R.V. embryo (full face, fig. 4; side face, fig. 1) 

 the protrusion of the mandibular portion of the face is not so well marked, and 

 the formation of the nostrils has proceeded very considerably. The roll of skin 

 behind the rhinarium has become less conspicuous, though it is still a well- 

 marked feature. The junction of the nasal and maxillary processes has com- 

 pleted the upper lip ; the portion of nasal process entering into the formation of 

 the lip being a large one. 



Chest Gland. — In no specimen have I been able to detect any external sign 

 of the chest gland described by Beddard in the adult. 



External Ear (see fig. 5). — The ear of the 23 mm. R.V. specimen is so 

 moulded by the epitrichium that no sculpturing is to be detected; it is directed 



