. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 10 Mr. W. E. de Winton on of frontals 21*5; interorbital constriction 12*1; length of nasals 14'5 ; greatest breadth of nasals 6 ; basal length 42 ; gnathion to back of palate 21"5 ; back of palate to foramen magnum 17*5; length of incisive foramina 4; diastema 12; upper molar series 9; outside molars 11 ; length of auditory bulla 10-5. Mandible: length (bone only) 28'5; back of incisors to coronoid 25'3, to condyle 28*5, to angle 25; greatest height 16 ; lower molar seri
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 10 Mr. W. E. de Winton on of frontals 21*5; interorbital constriction 12*1; length of nasals 14'5 ; greatest breadth of nasals 6 ; basal length 42 ; gnathion to back of palate 21"5 ; back of palate to foramen magnum 17*5; length of incisive foramina 4; diastema 12; upper molar series 9; outside molars 11 ; length of auditory bulla 10-5. Mandible: length (bone only) 28'5; back of incisors to coronoid 25'3, to condyle 28*5, to angle 25; greatest height 16 ; lower molar series 9. Type (cJ), British Museum no. 98. 5. 4. 9. Teeth worn. Collector G. L. Bates, no. 315. Fang name " ; Benito River, 15 miles from mouth, 6th Jan., 1898. Specimens of different ages and sexes killed from September to January do not vary in colour. The chief interest in this squirrel is due to the fact that the molars have a more complicated pattern than is found in any of its near allies. The accompanying figures will show the pattern of the molars of some of the group. Fig. 3 repre- sents R. ?Li of F. mystax; it will be seen that there is an extra infolding of the enamel on the outer side; the central Fig. 1. Fit Fig. 3. Fijr. Fig. 1.—R. —— of Funisciurus anerythrus. Fig. 2.—Ditto of F. pyrrhopus. Fig. 3.—Ditto of F. mystax. Fig. 4.—Ditto of F. Jacksoni. cusp is only rudimentary in the majority of the existing squirrels, but is found in Anomalurus and in some fossils which are not considered to belong to Sciurus, and it is not too much to say that had this tooth been found in a fossil state it would not have been referred to a true squirrel. Four specimens examined have teeth of precisely the same pattern ; and I think it will be interesting to palaeontologists to have an accurate figure recording the occurrence in an existing species. Although the teeth of F. pyrrhopus and F. anerythrus have been figured before in Dr. Forsyth Major's most val
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