58 COXTRIBUTIOXS TO NORTH AMERICAN ICHTHYOLOGY IV. 
“ Family VI. — SCYLLIID^. 
‘■‘■[The Boussettes.) 
“Sharks with two dorsal lias, without spines, the first above or be- 
hind the veutrals. Anal fin present, usually below the second dorsal; 
caudal fin rather long, with or without a basal lobe. Tail not keeled. 
Spiracles present, is'o nictitating membrane. Last gill-opening above 
the root of the pectorals. Month nsifally broad, with small teeth, sev- 
eral series being in function. Teeth with a median cusp, and 1 to 4 
small ones on each side. Usually a distinct furrow at the angle of the 
month. Nostrils near the month, sometimes confluent with it, some- 
times provided with cirri. Oviparous. Coloration often variegated. 
The egg cases quadrate, with i)rehensile tubes at the angles.* Sharks 
of the warm seas. Genera 8 or 9 ; species about 30. 
^‘{Scylliidw, Giintlier, viii, 400-414.) 
“ - Nostrils confluent with the month ; caudal bent upwards, with basal lobe. [Gin- 
qhjmostomatina}.') . 
‘ ‘ a Teeth in both jaws in many series, each with a strong median cusp, and one or 
two smaller cusps on each side ; nasal cirri present Ginglyjiostoma, 13. 
“ ** Nostrils not continent with the mouth ; eandal not bent upwards. [Scijlliina;.) 
“ 6. Nostrils separated by an isthmus ; no nasal cirri ; tail not serrated. 
^ ftrVTTTrTAT. (h). 
“ 13 .— CUNGaiVinOSTOMA Miiller & Henle.” (See page 18.) 
“ 13 (Z>).— SC¥L.A.IUIfI Cuvier. 
“ (Cuvier Rcgne Animal ed. 2, 1829 : type Scyllium cahdus Cuv. =Sqnaliis stcllaris Gmel.) 
“ Body rather stout. Head more or less short and broad, the snout 
low and blunt. Month rather large. Teeth small, sharp, tricuspid, in 
about four rows. Labial fold small or obsolete. Nostrils not confiiient 
with the month, separated by a broad isthmus from each other, each 
with a free flap and no cirrus. Spiracle moderate, close behind the 
eye. First dorsal beginning over veutrals ; second dorsal nearly over 
anal. Tail slender, not much bent upwards. Spotted. Warmer parts 
of the Atlantic and Pacific. As here understood, distinguished from 
Scyniorhinus Blainville, 181G [S. canicnlus L.), by the separate nasal 
valves. [(TxuUiov, a shark from to tear.) 
“*Head verj’^ broad and dej)rcssed, broader than long. {Cej)haloscylUum\ Gill.) 
* In Ecierodontidce the egg-cases are witliout tentacles and spirally twisted. Except 
the Scylliidw and Iletcrodontidcp, our sharks arc all ovoviviparous. 
t Gill, Ann. Lye. Nat. Hist. N. Y. 1801, 412 : type Scyllium laticeps Dum^ril. (/ce^aA^, 
head; u/vvAAtov, Scyllium.) 
