OCR Text |
Show 1878.] PROF. FLOWER ON A TWO-HORNED RHINOCEROS. 635 indication of a second or frontal horn. I have compared it with the eight skulls assigned to R. sumatrensis at present in London-four in the British Museum, and four in the Museum of the College of Surgeons. These skulls present considerable individual variation in general conformation, proportional breadth to length, in the development and form of the nasal bones, number and position of the lachrymal foramina, form of the posterior margin of the palate, and other details. The present skull, however, is strikingly different from all in its superior breadth compared with its length, and especially the breadth and flatness of the frontal region. The annexed table of dimensions exhibits the extent of this peculiarity; and, to make it more manifest, I have added the ratio of the breadth, taken between the anterior margins of the orbits (where the difference is most characteristic), compared with the entire length of the skull, the latter being taken as 100. O n looking down this column of the Table, it will be seen that, though there is a considerable variation among the 1. Adolescent (all permanent teeth except milk-molars), from Tipperah 2. Aged 2- Malacca. Died in Zool. Gardens, 1872. B. M... 3. Aged 2 - Sumatra. Mus. R. C S No. 2933 4. Adult. Pegu. B.M 5. Adolescent 3 (all permanent teeth except last molars). Sumatra. M. R. C. S. No. 2935 6. Young (last milk-molar remaining). Sumatra. M. R. C S. No.2937 7. Young (dentition as last). B.M 8. Younger (all milk-molars and first and second permanent molars). Sumatra. M. R. C. S. No. 2936 9. Still younger (all milk-molars and first permanent molars). * 4^> ^H GO O CD O *»» ."£ 3 a O H ^ ength from occi to anterior ex nasals. I-H 20*0 20-7 20*4 21-4 230 190 18-9 210*? 181 Nasals 1 i t»» Kl CQ o SH O ca reatest breadth gomata. C5 120 11*8 111 111 120 106 10*5 10*7 9*6 -roken. s> co SC > -<Ua X o> S-i 03 iterio oove nee. ireadth across aE of orbits, in gr lacrymal emine PH 6-8 6*0 5-2 59 6-0 5-0 50 5-2 5*0 ^ -u M a CD O CO CM O fl Is O i-l P H CO ? 03 SH PH 34-0 290 25-5 27-6 261 263 26-4 248? 27*6 CB SH t* OS o -*•*! -*•"• § cs a J 2 ""-H OH '•A . readth across ma middle of last tooth. pq 7-3 6-4 61 6-6 70 6-5 6*3 6-4 6-2 -d bo fl fl 03 ' - *---j SH fl mola (excl ength of upper premolar teeth first and last). I-* 8*0 6*5 6*6 6*9 7-6 7*3 6-9 7-0 rtH -P nfol CO o •p a O -' O O to fl • •2*3 O OQ s*-~ o o PH 400 31*4 32-6 32-7 33*0 38-0 36-5 33-3? Teeth nearly all lost. 41* |