174 THE PLAGIOSTOMIA. 



.produced and angular and have a concave indentation on the outer edge, though 

 they cannot be described as denticulate. Gill openings narrow, greatest width 

 two thirds of the length of the orbit. Fins all concave on the hind margin and 

 rounded on the outer angle. Pectorals rather small, applied to the side not 

 reaching the middle of the dorsal base, width about two thirds of the length, 

 inner angle about 90°, broadly rounded. Origin of the dorsal above the inner 

 angle of the pectoral, height about three fourths of the length of the base, base 

 length equal half the distance from the second dorsal, end of fin reaching a 

 vertical from the ventrals. Base of second dorsal nearly equal that of the first, 

 fin about half as large, middle of base above the origin of the anal. Anal ex- 

 tending about half the length of the orbit farther back than the second dorsal, 

 length of base two thirds of its distance from the caudal. Caudal nearly one 

 fifth of the total length; subcaudal lobe weak. 



Total length 23|, snout to abdominal pores 11, snout to fifth gill opening 

 4:1, snout to mouth 1^, and caudal 4| inches. 



Grey with scattered small spots of black; lower surfaces white; fins darker, 

 subcaudal blackish toward lower edges. 



Tliis species has a longer snout, smaller eyes, a smaller mouth, smaller, less 

 pointed pectorals, smaller dorsals and narrower gill openings than G. mustelus; 

 its teeth are more deeply indented, its dorsal farther back and it has black spots 

 instead of white. Compared with G. laevis the snout is longer, the mouth smaller, 

 the teeth are not angularly notched, are without the denticles, the eyes and gill 

 openings are smaller, the pectorals are shorter and less produced in the outer 

 angle, less broad in the inner and the fins are not tipped with black. 



Measurements from a specimen taken at Nice, France, by Col. Theodore 

 Lyman. 



Galeoehinus lunulatus. 



Mustelus lunulatus Jordan & Gilbert, 1882, Proc. U. S. mus., 5, p. 108; Jord. & Everm., 1896, Bull. 



47, U. S. Mus., p. 28; Gilbert & Starks, 1904, Mem. Cal. acad. sci., 4, p. 5, pi. 1, f. 1. 

 Galeus lunulatus Jordan, 1895, Proc. Cal. acad. sci., ser. 2, 5, p. 382. 



Body elongate, slender; head rather narrow; snout long, about one and 

 one third times the width of the mouth, broadly rounded to a blunted point. 

 Nostrils near the mouth, entirely in the posterior half of the snout; anterior valve 

 with a short broadly rounded lobe. Eye large, length of orbit two fifths of the 

 preoral length, that is, equal to the width of the largest gill opening. Mouth 

 rather small, length more than half the width; labial folds short, less than half 

 as long as a jaw, lower longer and extending farther forward. Teeth small, with 



