70 MONOGRAPH OF THE FRESH WATEK HI. 



The numbers 8', 73* and 73 b we have added to the series; 72 is called ropnttemporal by Professor 

 Owen. 



n .< neural spines. n' neuro-caudal plate. 



n interneural spines. h' hrema-caudal plate. 



<Jn denno-neural spines. </// caudo-dermo-ncural spines. 



h s haemal spines. pi pleurapophysis. 



/ // intcrh!emal spines. 



dh dermo-haeinal spines. 



a represents the tenth vertebra, with its pleurapophyscs and pelvic appendages below. 

 is an anterior thoracic vertebra, 

 j is a group of five vertebras, two pelvic and three caudal. 



t belong likewise to the caudal region. 



Fig. G 9. Skull of Coitus viscosm; Fig. 6 from above; Fig. 7 from below; Fig. 8 in profile; and Fig. 



9 from behind. 

 Fig. 10 13. Skull of Coitus Franklinii; Fig. 10 from above; Fig. 11 from below; Fig. 12 in profile; 



and Fig. 13 from behind. 

 Fig. 14 17. Skull of Cdifux M'lTsonn; Fig. 14 front above; Fig. 15 from below; Fig. 1G in profile; 



and Fig. 17 from behind. 

 Fig. 18 21. Skull of C. Richardsonii ; Fig. 18 from above; Fig. 19 from below; Fig. 20 in profile; 



and Fig. 21 from behind. 

 Fig. 22 25. Skull of 7V/./A<//.-/.s Thompson!! ; Fig. 22 from above; Fig. 23 from below; Fi L '. 'Jl in 



profile ; and Fig. 25 from behind. 

 Fig. 26 2!). Skull of Acanthocottvs rmjinianus ; Fig. 20 from above; Fig. 27 from below; Fig. 2S in 



profile ; and Fig. 29 from behind. 

 Fig. 30 32. Vertebrae of Acanth>''-/tn* ,-i'r>/iin'anits; Fig. 30, thoracic, with its pair of pleurapophyscs or 



ribs; Fig. 31, pelvic, with its pair of pelvic- appendages; Fijr. :!'2, caudal. 

 Fig. 33 35. Enccphalon of AnnitbH-ottux rfi-i/iiiiinnix; Fir. :;:; tr.nii above; Fijr. :U from below; and 



Fig. 35 in profile. 

 Fig. 36 38. Encephalon of Triylopsis Thomptonii, twice the natural size ; Fig. 36 from above ; Fig. 37 



from below ; and Fig. 38 in profile. 

 Fig. 39 H. Eneephalon of Coitus gracili*, twice the natural size; Fig. 39 from above; Fig. 40 from 



below; and Fig. 41 in profile (under the name of ('. </"/,ini,/-s on the plate). 

 Fig. 42. An imperfect sketch of the encephalon of C. goJttoirfes, twice the natural .size, seen from abo-\e 



(under the name of C. </i-<i<-ilix on the plate). 

 Fig. 43 45. Encephalon of C. viscoms, twice the natural size; Fig. 43 from above; Fig. 44 from below ; 



and Fig. 45 in profile. 

 Fig. 46 48. Kiiccphalon of A,;i,,ili,H-;ti<i* i;i,-;,il,;i!f; Fig. 46 from above; Fii.'. 17 from below; and 



Fig. 48 in profile. 



