66 CLASS XIV. 



chial fissures situated in the constricted neck behind the head, 

 approximate. Pectoral fins rhombic, produced anteriorly at the 

 sides of the head. Two dorsal fins above the tail. Anal fin none. 



Sp. Squatina vulgaris RiSSO, Squalus Squatina L., BLOCH Ichth. Tab. 116; 

 YAREELL Br. Fishes, II. p. 407; in the Mediterranean and North Sea. 

 Compare H. BOURSE WILLS Dissert, med. inaug., continent olservationes 

 anat. de Squatina Icevi. L. B. 1844, 8vo. 



PristiopTiorus MUELL. and HENLE. Head produced into a flat, 

 oblongo-triangular process serrated on each side. Two long cirri 

 below in middle of snout. Anal fin none. 



Sp. PristiopTiorus cirratus, Pristis cirratus LATH., Linn. Trans, n. PI. 26, 

 fig. 5, PI. 27, South Pacific, New Holland, Japan. 



Notwithstanding the external resemblance to Pristis this fish is a true 

 shark, with lateral branchial apertures, which are situated in front of the 

 pectoral fins, whilst in Pristis they are placed below them. 



Squalus L. (exclusive of some species). Body elongate, with 

 head produced into a snout above the mouth. Branchial apertures 

 at the sides, situated in front of the pectoral fins or above them. 

 Dorsal fins mostly two, the anterior placed nearly in the middle of 

 back before the ventral fins. 



A. Squall with anal Jin none. 



Scymnus Cuv. Temporal foramina. Teeth acuminate. Dorsal 

 fins two, unarmed, small or moderate, the first at the middle of 

 back or nearer the second. 



(Sub-genera : Echinorhinus BLAINV., Lcemargus and Scymnus 

 MUELL. and HENLE). 



Sp. Scymnus lickia BONAP., Squalus americanus GM., BONAP. Faun. Ital. in. 

 Tab. 142, Mediterranean Sea, Atlantic Ocean; Scymnus borealis FLEMING, 

 Scymnus micropterus VALENCIENNES, Nouv. Ann. du Mus. i. p. 454, PL 

 20, in the North Sea, &c. 



Spinax Cuv. (and Centrina ejusd.). Temporal foramina. Spine 

 in front of each dorsal fin, free or contained in the anterior part of 

 fin, exsert at the point. Teeth small, acuminate, crowded in several 

 rows. 



Sp. Squalus Acanthias L., BLOCH Ichth. Tab. 85, Skandinav. Fislcar. Tab. 

 46; the picked shark; this species is amongst the smaller sharks, and 

 seldom attains a length of 3 feet. 



