228 Memoir Sears Foundation for Marine Research 



Size. No information is available as to the length to which this species may grow. 

 The specimen at hand does not contain eggs. 



Developmental Stages. Not known; see frojundorum, p. 224. 



Range. Known only from the specimen recorded above, taken off the north coast of 

 Cuba. The depth of capture, combined with the uniformly dark coloration, suggests that 

 this is a deep-water species. 



Synonym and Reference: 



Afristurus riveri Bigelow and Schroeder, Proc. New Engl. zool. CL, 2j, 1944: 23, pi. 7 (descr, ill., type loc. 

 off the north coast of Cuba, "Atlantis" Sta. 2993, 580 fathoms). 



Family PSEUDOTRIAKIDAE 

 False Cat Sharks 



Characters. Two dorsal fins, the ist as long as caudal,^ or longer, the rear end 

 of its base over or a little anterior to origin of pelvics ; 2nd dorsal as high as ist or higher; 

 caudal less than ^/4 of total length, not lunate, its lower anterior corner not expanded as a 

 definite lobe, its axis but little raised; caudal peduncle not flattened dorso-ventrally or 

 expanded laterally, without precaudal pits above or below; sides of trunk without longi- 

 tudinal dermal ridges; snout not greatly elongate; jaws not widely protrusible; gill open- 

 ings very short, 5th over origin of pectoral; gill arches without rakers and not intercon- 

 nected by a sieve of modified denticles; nostril entirely separate from mouth, its anterior 

 margin without barbel; spiracles present; lower eyelid without nictitating membrane, but 

 with a well marked longitudinal fold; teeth small, numerous, with larger median and 

 smaller lateral cusps, 6 to 13 series functional; head of normal shape, not widely expanded 

 laterally; rostral cartilages 3, united terminally; radials of pectoral mostly on metapter- 

 ygium, those on meso- and propterygia fused; mesopterygium and propterygium much 

 smaller than metapterygium." Development ovoviviparous. 



Genera. One genus only. 



Genus Pseudotriakis Brito Capello, 1867 



Pseudotriakis Brito Capello, J. Sci. math. phys. nat. Lisboa, i (2), 1867: 315, 321 ; type species, P. microdon 

 Brito Capello, Setubal, Portugal. 



Generic Characters. Those of the family. 



Range. Both sides of North Atlantic, in deep water; Japan. 



Sfecies. Only two species known. 



1. The very long first dorsal is the most striking character of this family. 



2. For detailed account and illustrations of the skeleton, see Jacquet (Bull. Inst, oceanogr. Monaco, 3d, 1905). 



