358 MR. 0. TATE REGAN ON SHARKS [Apr. 28, 



at the end of the base of both dorsals and the anal, one on the 

 anterior part of the lower caudal lobe. 

 Waigion. 



1. (210 mm.) tj'pe of the species. Waigiou. Dr. P. Bleaker. 



7. Chiloscyllium. 



Chiloscyllium Miill. & Henle, Arch. f. Natui-gesch. 1837, i. 

 p. 395, and Plagiost. p. 17 (1841) ; Glinth. Cat. Fish. viii. p. 410 

 (1870). 



Hemiscyllium Miill. & Henle, Arch. f. Naturgesch. 1838, i. 

 p. 83, and Plagiost. p. 16. 



Synchismibs Gill, Ann. Lye. N. York, 1861, p. 413. 



Head obtuse; body elongate, subcylindrical. Mouth trans- 

 verse ; teeth small, pointed, usually with one or two pairs of 

 small accessory cusps ; lower lip not divided by a symphysial 

 groove. Nasal valves separate, each with a cirrus. Eye small ; 

 no longitudinal fold below the eye. Spiracles moderately large, 

 below the level of the eyes, and usually extending forward beneath 

 them. Gill-openings of moderate width ; last three above the 

 base of pectoral ; last two very close together. Dorsal fins sub- 

 equal, the first above or behind the pelvics, the second in advance 

 of the anal, which is continuous at the base with the lower caudal 

 lobe. Caudal of moderate length ; axis not directed upwai-ds ; 

 lower lobe notched posteiiorly. Pectorals broad, with straight or 

 convex edges and rounded angles. 



Seven species from the Indo-Pacific. 



Synojosis of the Species. 



I. Mouth nearer to the end of the snout than to the vertical 

 from the eyes , origin of first dorsal behind the base of 

 pelvics ; dorsal fins with concave free edges. 



A. A large ocellus above the pectoral fin. 



Base of first dorsal f to J its distance from the second ; body 



with scattered rounded dark spots 1. ocellatum. 



Base of first dorsal f its distance from the second ; body with 



numerous close-set dark spots 2. trispeculare. 



B. No ocellus above the pectoral fin 3. freycineti. 



II. Mouth nearer to the vertical from the eyes than to the end 

 of the snout ; fold of the lower lip continuous. 



A. Origin of first dorsal above the anterior part of base of 



pelvics; dorsal fins with concave free edges 4. ptmctatum. 



B. Origin of first dorsal above the posterior end of base of 



pelvics ; dorsal fins with straight or convex free edges. 



1. A single more or less distinct median dorsal keel. 

 Anal as deep as lower caudal lobe, its length f to § that of the 



latter in front of the notch ; no white or pale spots 5. griseum. 



Anal usually deeper than lower caudal lobe, its length from 

 less than f to nearly f that of the latter in front of the 

 notch; body with round or oval white or pale spots 6. plagiosum. 



2. Three dorsal keels 7. indicum 



