MONSTROSITIES. 397 



3. Perocephalus. — Head defective; 7 species : P. pseiidocephalus (ap- 

 parently without a head), P. aprosopus (head without a face), P. micro- 

 cephalus (small head), P. agnathiis (head without a jaw). Varieties : a^ 

 P. agnatJiwi hypostojnus (mouth a longitudinal fissure beneath the ordinary 

 situation) ; b, P. agnathiis microstomns (small mouth) ; r, P. agnathus 

 astomus (without a mouth), P. brachyrhy?ichus (short face or nose), P. 

 anomatus (without eyes), P. aotus (without ears). 



4. Perosomus. — The whole of the body defective ; 4 species : P. hemi- 

 cephalicus (body defective and head absent), P. horridiis (horrid defor- 

 mity), P. ehunbls (loins absent), P. pseiidoscelus (body defective, with 

 posterior limbs incomplete). 



5. Perocormus. — Trunk defective ; 3 species : P. oligospondylus (de- 

 fective vertebrae), P. ecaudatus (without tail), P. anacdoca (without 

 external generative organs). 



6. Peromelus. — Limbs defective ; 6 species : P. apus (without limbs), 

 P. achirtis (without anterior limbs), P. vionochirus (with only one anterior 

 limb), P. ascelus (without posterior limbs), P. monoscehis (with only one 

 posterior limb), P. micromelus (limbs shortened) ; with the varieties, P. 

 micromelus microchirus (anterior limb short), P. microtnelus microscelus 

 (posterior limb short). 



ORDER II. — Simple Monstrosities through Smallness of Parts : — 



7. Nanosomus. — Limbs and trunk small — dwarf ; 2 species : N. pyg- 

 cemus (short and low, but without disproportion of parts), JV. caticeps 

 (cat-faced dwarf). 



8. Nanocephalus. — Small head ; 3 species : N. micrommatiis (eyes 

 too small), N. brachyotus (ears too short), N. brachygnolus (lower jaw too 

 short). 



9. Nanocormus. — Short trunk ; 2 species : IV. rectus (vertebral col- 

 umn straight, but very short), N. curvatus (vertebral column short, and 

 curved to one side). 



10. Nanomelus. — Limbs short; 5 species: N. brevipes (all the limbs 

 short), N. brachychirus (anterior limbs too short), N. campylochirus 

 (anterior limbs short and crooked), N. chiropterus (anterior limbs short, 

 with cutaneous folds resembling wings), N. compyloscelus (posterior limbs 

 short and crooked). 



ORDER III. — Simple Monstrosities through Abnormal Division 

 OF the Body : — 



11. Schistocephalus. — Division of the head ; 5 species : S. hemiceph- 

 alus (cleft in the middle) ; with the varieties : a, S. hemicephalus partialis, 

 or hydrencephalocele (partial hernia of the brain, with hydrocephalus) ; b, 

 S. hetnicephahis totalis (absence of all the cranium) ; c, S. hemicephalus 

 complicatus (cleft cranium, face defective) ; 6". bifidus (face divided), S. 

 fissipalatinus or rictus lupinus (cleft palate), S. fissilabrus or labium lepori- 



num (cleft or harelip), S. megolostomus (wide mouth). 



12. ScHiSTOCORMus. — Divided trunk; 6 species: S. fissicollis (neck 

 cleft), 6*. fissisternalis (sternum divided), S. schistepigastrico-sternalis (di- 

 vision of the sternum and anterior portion of the abdomen), .S". exom- 

 phalus (divided umbilicus), S. fissiventralis (the whole of the abdomen 

 divided), S.fissispinalis or spina bifida (division of the spinal column). 



