Fishes of the Western North Atlantic 279 



symphysis small, symmetrical, erect, the next 9 to 12 increasingly oblique with nearly 

 straight inner margins but outer margins deeply notched, with 3 to 4 strong denticles 

 near basej those toward corners of upper jaw decreasing successively in size, broader 

 relative to height, and with cusps and denticles less prominent, the outermost 2 or 3 

 low, evenly rounded, and the outermost of all minute j first 6 lower teeth erect, with 

 slender cusps and broad bases, without denticles, the next 5 to 6 increasingly oblique, 

 their bases denticulate on the outer side as in upper teeth, the cusps decreasing in rela- 

 tive length in successive teeth, the outermost 5 lower teeth low and evenly rounded, the 

 outermost of all hemispherical, minute j i to 3 rows functional in upper jaw at symphysis, 

 I row along sides of jaw, and 2 to 3 rows at corners of mouth; 2 to 4 rows functional at 

 symphysis of lower jaw, i to 2 rows along sides of jaw, and 2 to 3 rows near corners. 



Origin of ist dorsal about opposite inner corner of pectoral, the midpoint of its 

 base only about % as far from axil of pectoral as from origin of pelvics, its anterior 

 margin only very slightly convex, apex subacute, rear margin deeply concave, free 

 rear tip slender and about Vs as long as the base, its vertical height about as great as 

 distance from eye to and gill slit. Second dorsal similar to ist, but only a little more 

 than % as long at base and not more than Yo as large in area, its origin a little anterior to 

 origin of anal. Caudal with narrowly rounded tip, well marked subterminal notch, its 

 terminal sector nearly V3 the length of fin, the lower anterior corner forming an arcuate 

 sharp-tipped lobe directed rearward, about 40% as long as upper lobe, each measured from 

 its respective precaudal pit. Anal similar to 2nd dorsal, but only a little more than % 

 as long at base. Pelvics (in female) a little smaller than anal in area, with nearly straight 

 anterior margins, moderately concave distal margins, narrowly rounded apices and 

 subacute tips. Pectoral about 70% as long as head, only about as large in area as ist dorsal, 

 and very characteristic in shape,* with moderately convex outer margin which is increas- 

 ingly so toward tip, deeply concave distal margin, nearly straight inner margin, and nar- 

 rowly pointed tip. 



Color. Described as grayish brown in life, paler below, the fins dark with pale hinder 

 margins; after many years in alcohol the type is mouse-gray above and of a paler shade of 

 the same below. 



Size. The fact that a female of the closely allied West African species, 1,380 mm. 

 (about 54 inches) long, contained embryos, suggests that this Shark does not reach a 

 large size. 



Developmental Stages. It is not known whether or not a placental connection is de- 

 veloped between embryo and mother; the embryos have not been described. 



Habits. Nothing is known of its habits, but its teeth suggest a diet of fish or squid. 



Range. So far known orJy from the type specimen taken oflF the coast of southern 

 New England. All that is known of its origin is that Garman° obtained it, apparently in a 



4. Hence the specific name fectoralis. 



5. Garman, Bull. Mus. comp. Zool. Harv., ^6, 1906: 203. 



