MONSTROSITIES. ;J99 



4. SoMATOTRiDYMUS. — Triple body ; 1 species : .S". slenialia (three 

 chests united). 



ORDER II. — MoNSTiiUs with Two nE.\Ds — Cephaluilidi/ini: — 



5. Diruosopus. — Double face ; 3 species : D. scjunctus (the two faces 

 separate), D. distans (the two faces diverging), including three varieties; 

 a, D. distans distomus (a mouth in each face); b, D. distans monostomus 

 (a mouth in one face only); c, D. distoma hemicephalicus (without a 

 cranium); D. conjunctns (two faces united,) has two varieties : a,D.con- 

 junctus distomus (double mouths); b, D. conjunctns monostomus (with 

 one mouth). 



6. MoNoc'KANLS. — Single crauiuui ; 4 species: iV. 7;ieso{7na/«s (the lower 

 jaw included in or united to the other from the commencement of the 

 branches), M. di'/natus (lower jaw double), M. hcteroprosopus (diverse 

 faces), M. bimandibularis (upper jaw double). 



7. Hetekocei'halus. — Double heads, one of which is complete, the 

 other very incomplete ; 2 species : //. interpositus (between the two 

 branches of the lower jaw of the complete head is interposed the lower 

 jaw of the incomplete one), //, oppositus (the lower jaw of the complete 

 head is depressed in front, and on its upper surface — anterior extremity 

 — it is united to the corresponding part of the second jaw, with which 

 it forms an acute angle). 



ORDER III. DOUHLE-HEADED MONSTROSITIES, WITH THE TUUNK 



WHOLLY OK I'AKTIALLY DoUBLE : — 



8. DicEi'HALUs.— Two separate heads; 7 species: D. biatlanticus 

 (double head and two atlases), D. suhbicollis (double head with appar- 

 ently two necks), I), bicollis (double head and two necks), with two 

 varieties : D. bicollis omoceplialus (both heads alike), D. bicollis hetcro- 

 cephalus (one head perfect, the other imperfect) ; D. subbidorsiialis 

 (double head, with apparently a double back), D. bidorsualis (double 

 head with double back), J), bilumbis (double head and double loins), 

 D. bispinalis (double head and vertebral column), has two varieties : a, 

 D. bispinalis quadrupcs (with four limbs); b,D. bispinalis acliirus (with- 

 out anterior limbs). 



9. DicHANUs. — Double cranium ; 1 species : D. bisjyinalis (cranium and 

 vertebral colunm double). 



ORDER IV. — Monstrosities with a Single Head, hut the 

 Trunk or Limhs more or less completely Douhle — 



Cormo-nielodidi/mi : — 



10. DiPYGUs. — Double croups ; 3 species : D. bidorsualis (double croup 

 and back), D. subbidorsualis (double croup, with half the back doubled), 

 D. bilutnbis (croup and loins doubled;, containing two varieties: a, i). 

 bilumbus teleoccplialus (with head regular) ; b, D. bilumbis cacoccpJialus 

 (with head irregular). 



11. Heterodidymus. — Unequally-developed twins, the body of one 

 being large and regularly or irregularly formed, the other being small 

 and slenderly attached to some part of its fellow ; 3 species : II. octipcs 

 (with eight feet), containing two varieties : a, II. octipcs cmprosthochiro- 

 pliorus {the anterior limbs of the parasitic twin situated in front) ; b, II. 

 octipcs plcurochirophorus (the anterior limbs of the parasitic twin situ- 

 ated at the side) ; //. tctrasulus (with four posterior extremities), also 

 containing two varieties : a, II. tctrasulus monopygus (with one croup) ; 



