S4 THE PLAGIOSTOMIA. 



of the distance from the caudal. Ventrals rather short. Caudal fins small. 

 Scales small, tricuspid to granular, median cusp and keel strong, some larger 

 granules on each side near the median line of the back. 



Brownish with faint spots of darker, and with larger blotches or cross bands 

 on the back. 



Valparaiso ; Patagonia. 



Halaelurus natalensis. 



Scyllium natalense Redan, 1904, Ann. & mag. nat. hist., ser. 7, 14, p, 128. 

 Scyliorhinus natalensis Regan, 1908, Ann. & mag. nat. hist., ser. 8, 1, p. 461. 



Head broad, depressed; snout obtusely pointed. Mouth with labial folds 

 around the angle, extending on two fifths of the lower jaw and less than one fifth 

 on the upper. Teeth tricuspid, middle cusp longest. Dorsals subequal, length 

 of base about two fifths of their distance apart. Origin of first dorsal above 

 the posterior third of the bases of the ventrals ; origin of second dorsal in advance 

 of the hind end of the base of the anal. Base of the anal one and one half times 

 that of the second dorsal or five sixths of the distance from the subcaudal. 

 Hind margins of ventrals very oblique. 



Greyish; with broad dark-edged bands of brown across the back, and with 

 less distinct intermediates of brown marblings or reticulations. Top of head 

 reticulated; first band between the hinder parts of the eyes, convex on the back- 

 ward edge; the second a pair of oval patches at the level of the gill openings, 

 not quite meeting on the back ; third at the hinder parts of the pectorals ; fourth 

 in front of the dorsal, broken into three sections; fifth and seventh crossing the 

 bases of the dorsal fins; and several others appear on the tail toward the end. 

 There is a large blotch of brown on each of the pectorals and the ventrals and 

 on the upper portion of each dorsal. 



Length of the type about thirteen inches (325 mm.). 



Apparently a variety of H. quagga of Alcock. 



Coast of Natal. 



Halaelurus quagga. 



Scyllium quagga Alcock, 1899, Cat. deep-sea fishes Indian mus., p. 17; 1900, 111. zool. Investigator, 



pi. 27, f. 1. 

 Scyliorhinus quagga Regan, 1908, Ann. & mag. nat. hist., ser. 8, 1, p. 461. 



Head broad, depressed and bluntly acuminate at the end of the snout. 

 Anterior nasal valves widely separated, with a very short and inconspicuous 

 cirrus. Eyes large, length more than two thirds of that of the snout. Spiracles 



