i 



2. UEMIGALEUS. 375 



a. Stuft'ed, 4',i inches long. From the Collection of the Zoological 



Society. — One of the tyjncal specimens. 



b. Stuffed, 2-i inches long. Calcutta. 



35. Carcharias oxyrhynchus. 



Carcharias (Prionodon) oxyrhynchus, MM. ^- Jlenle, p. 41, pi. lo; 



I}umei'il, JElasmobr. p. .3oC!. 

 Isogomphodou oxjrrhynchus, Gill, Ann. Lye. Nat. Hint. New York, 



vii. p. 410 (name only). 



Snout very much elongate, pointed, narro\y ; the distance between 

 the mouth and extremity of the snout is about twice the distance 

 between the nostrils. A short labial fold on the upper and lower 

 jaws, proceeding from the angle of the month. Teeth small, ^^ 

 erect, rather slenderer in the lower jaw than in the upper ; only the 

 upper teeth show a very fine serrature near the apex. Pectoral fin 

 very large and broad, extending beyond the dorsal, which commences 

 vertically above the root of the pectoral. The second dorsal and 

 anal subequal in size and form, only about half the size of the first 

 dorsal. Eye small ; gill-openings of moderate width. 



Atlantic coasts of Tropical South America. 

 a. StuiFcd, 43 inches long. 



2. HEMIGALEUS. 



Hemigaleus, Bleek, Verh. Bat. Gen. xxiv. Play. p. 45. 

 Hemigaleus et Chsenogaleus, Gill. 



The first dorsal fin opposite to the space between the pectorals and 

 ventrals, without spine. Caudal fin with a single notch. A pit on 

 the tail, above and below, before the commencement of the caudal 

 fin. Membrana nictitans present. A minute pore -like sjnracle* 

 behind the eye. Mouth crescent-shaped, with labial folds. Only 

 the teeth of the upper jaw with dcnticulations. 



East-Indian archipelago. 



The two species of this genus may easily be confounded with those 

 referred to " Hypoprion,''' to which, indeed, they are most closely 

 allied, although referred to different families in some of the recent 

 artificial arrangements. They may be distinguished, more ca.sily than 

 by the presence or absence of the rudimentary spiracle, by the greater 

 develojiment of the labial folds, which in Hypoprion are reduced to 

 an extremely short impression at the angle of the mouth. 



1. Hemigaleus microstoma. 



Bleek. Verh. Bat. Gen. xxiv. PUk/. p. 4(), pi. 2. lig. 9 ; DiimerU, JElasmobr. 

 p. 392. 



Spiracle minute, not larger than other pores. Length of the 

 praeoral portion of the snout rather more than the width of tiio mouth. 



* I could not convince luysell' tliat the canal communicates with the pharjriii. 



