MUSEUM OF COMPARATIVE ZOOLOGY. 



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XIX. Acanthias americanus Storer. Fig. 1, entire side ; 2, half of lower, 3, half 



of upper, and 4, front view of head ; 5, side of tail ; 6, section of canal 

 at side of tail. 



XX. Somniosus carcharias Miiller ; Garm. Fig. 1, top, and 2, lower view of 



head. 

 XXI. Rhina squatina L. ; Dum. Fig. 1, top of head, with tubules ; 2, full 

 length, main tubes ; 3, front, and 4, lower view of head. 

 XXII. Pristiophorus cirratus Lath. ; M. & H. Fig. 1, top, and 2, lower view 

 of head. 



XXIII. Pristis pectinalus Latham. Fig. 1, top, and 2, lower view of anterior 



half of total length. 



XXIV. Rhinobatus planiceps Garman. Fig. 1, top, and 2, lower view. 

 XXV. Syrrhina brevirostris Miiller & Henle. Fig. 1, top, and 2, lower view. 



XXVI. Uraptera agassizii M. & II. Fig. 1, lower, and 2, upper view. 

 XXVII. Raia lazvis Mitchill. Upper surface, showing tubes and tubules. 

 XXVIII. Raia Icevis. Upper view, showing (1) the hyaline mucous ducts of the 

 " ampulla? of Lorenzini," and (2) the main tubes of the canal system. 

 XXIX. Raia lasvis. Fig. 1, lower, and 2, upper view of head. 

 XXX. Raia ocellata Mitch. Fig. 1, top, and 2, lower view of disk. 

 XXXI. Torpedo califomica Ayres. Upper view. 

 XXXII. Torpedo marmorata Risso. Upper view. 



XXXIII. Narcine brasiliensis Olf. ; Henle. Upper view. 



XXXIV. Potamotrygon motoro M. & H. ; Garm. Fig. 1, upper, 2, lower surface. 

 XXXV. Disceus strongylopterus Schomb. ; Garm. Fig. 1, upper, 2, lower surface. 



XXXVI. Urolophus halleri Cooper. Upper view. 

 XXXVII. Urolophus halleri. Lower view. 

 XXXVIII. Taniura lymma Cuv. ; M. & H. Fig. 1, upper, and 2, lower view. 

 XXXIX. Dasybatus nudus Gthr. ; Garm. Fig. 1, upper, and 2, lower view. 

 XL. Dasybatus dipterurus Jordan. Fig. 1, lower, and 2, upper view. 

 XLI. Dasybatus tuberculatus La C. ; Garm. Lower view. 

 XLI1. Dasybatus tuberculatus. Upper view. 

 XLIII. Fig. 1. Pteroplatea hirundo Lowe. Upper view. Fig. 2. Pteroplatea 



marmorata Cooper. Upper view. 

 XLIV. Pteroplatea valenciennii Dumeril. Upper surface. 

 XLV. Pteroplatea valenciennii. Fig. 1, upper, and 2, lower view. 

 XLVI. Myliobatis aquila L. ; Cuv. Upper surface. 

 XLVII. Myliobatis aquila. Fig. 1, lower surface, and 2, side of head. 

 XLVIII. Myliobatis freminvillii Lesueur. Fig. 1, upper, and 2, lower view. 

 XLIX. Aetobatis narinari Euph. ; M. & H. Fig. 1, upper, and 2, lower surface ; 

 3, lower view of end of pectoral ; 4, side and lower view of head ; 

 5, tail and hinder part of body. 

 L. Rhinoptera brasiliensis Miiller. Fig. 1, upper, and 2, lower view of disk ; 

 3, lower side of end of pectoral fin ; 4, side and lower view of head. 

 LI. Rhinoptera jussieui Cuv. ; Gthr. Fig. 1, upper, 2, lower, and 3, side and 



lower view of head. 

 LIL Dicerobatus ol/er si i M\i\ler ; Gthr. Fig. 1, upper surface ; 2, side of head. 

 LIII. Dicerobatus olfersii. Lower surface. 



