SUPPLEMENT, 1888. 811 



Page 723. Add 



Family— EHINODONTID^. . 



Spiricales minute : no nictitating membrane. Gill-openings wide. Two spineless dorsal fins, the 

 origin of the first somewhat in advance of the ventrals : the second small, placed nearly opposite the anal : 

 lower caudal lobe well developed. A keel along the side of the tail. A pit at the root of the caudal fin. 



Genus 1. — Rhisodon, Smith. 



Definition as in the family. Mouth and nostrils near the extremity of the snout. Teeth 

 sriiall and conical. Gill-rakers similar to those of the basking-shark of Northern seas. 



Geographical distribution. — Ceylon and Seychelles to the Cape of Good Hope. Specimens 

 are said to have exceeded fifty and even seventy feet in length. It is a harmless form. 



Rhikodon ttpicus. 



Smith, Illus. S. African Fish, pi. 2G ; Miiller and Heule, p. 77, t. xxxv, f. 2 (teeth) ; 

 Dumeril, Elasm. p. 428 ; Haly, Ann. and Mag. N. H. (5), xii, p. 48. 



Snout broad, flat, and short. Eyes — small. Upper jaw with a long labial fold. 

 Colours — brownish white dots and narrow transverse lines. 



Habitat. — One example recorded from the west coast of Ceylon. 



Page 725. Add 2. Gingltmostoma concoloe. 



Nehrius concolor, Riipp. N. W. Fische, p. 62, t. xvii, f. 2. 



Ginglymostoma concolor, Cantor, Mai. Fish. p. 395; Giinther, Catal. viii, p. 409; Klunz. 



Synopsis F. R. M. 1871, p. 672. 

 Ginglymostoma ruppellii, Bleeker, Verh. Bat. Gen. xxiv, Plagios. p. 91 ; Dumeril, Elasm. 

 p. 334. 



Snout short. The nasal cirrus nearly reaches tlie lower lip. Teeth — in three rows, 

 with one central and four or five lateral cusps, having serrated edges. Fins — dorsal, 

 pectoral, and anal fins with pointed angles. Second dorsal much smaller than the first, 

 and placed nearly opposite to but larger than the anal. Caudal fin one-third of the total 

 length. 



Habitat. — Red Sea, through those of India to the Malay Archipelago. 



Page 729. Add 4. Pristis pectinatus. 



Latham, Trans. Linn. Soc. 1794, ii, p. 278, pi. xxvi, f. 2 (snout) ; Bl. Schn. p. 351, pi. Ixx, 

 f. 1; Miill. and Henle, p. 109; Blyth, Journ. As. Soc. Beng. 1860, p. 36; Dumeril, 

 Elasmobranchs, p. 475; Giinther, Catal. viii, p. 437; Klunz. Synop. F. R. M. 1871, 

 p. 673. 

 Squalus scic, Lacep. i, p. 286, pi. viii. 



Rostrum nearly twice as wide at its base as at its termination, armed with from 24 to 

 27 pairs of teeth which are generally long and somewhat strong and not placed opposite 

 one another, while they may be directed somewhat posteriorly. Anteriorly the interspace 

 between each tooth equals about the width of their base, but among the most posterior 

 ones it becomes double that distance. Fins — first dorsal commences opposite the ventral, 

 the second dorsal about of equal size to the first. JN'o lower caudal lobe. Colours — 

 sandy-brown becoming lighter beneath. 



Habitat. — Red Sea, through the Indian Ocean. 



Page 732. Add Rhihobatus coLUMNiE. 



Bhinobatus (Syrrhina) columnce, Miiller and Henle, p. 113 : Dumeril, Elasm. p. 486. 



„ „ annulatus, Miill. and Hen. p. 116 : Smith, Illus. Zool. S. Afri. Pisces, 



pi. xvi : Dumeril, 1. c. p. 487. 



