pelvics and extending, interrupted by anal fin, 

 nearly to lower caudal fin. 



Teeth similar in upper and lower jaws (fig. 9), 

 principal ones with three or five cusps, central 

 cusp of each tooth much the longest, three to five 

 series functional. Dorsolateral denticles (fig. 

 7F) for the most part imbricate, three pointed, 

 the central posteriorly directed point much the 

 longest, ventral denticles leaf-shaped, with a sin- 

 gle point. 



Vertebrae (in 36 specimens) 132 to 142, raono- 

 spondylous vertebrae 29 to 35. 



Type species oviparous, eggshells (fig. 19) with 

 rather thick walls, their surfaces striated longi- 

 tudinally, opaque, about 44 mm. by 14 mm., not 

 including tendrils developed at the four corners. 



Claspers of adult males of type species long, 

 extending well beyond tips of pelvics, their tips 

 tapered, without hooks; clasper siphons very 

 large, long, extending under skin of belly as far 

 forward as axils of pectorals. 



Livers relatively small, occupying only the an- 

 terior half of body cavity in adults. 



General pattern of seven dorsal saddles of 

 darker color showing at least in young; sometimes 

 obscure in adults in the type species. 



The genus is named for William C. Schroeder, 

 whose careful and pioneering work with Henry 

 B. Bigelow on cartilaginous fishes contributed 



greatly to a renewal of interest in problems relat- 

 ing to this important group of marine animals. 



Schroederichthys maculatus new species 



Figures 4, 5, 7, 0, 16, 17, and 19; tables 1, 5, and 6. 



Rolotype.— Adult male 328 mm. total length, USNM 

 185556, collected in shrimp trawl at R/V Orraon 

 station 1870, August 21, 1957, from about 410 m. ; lat. 

 16°39' N., long. 82°29' W., in the Caribbean sea NNW 

 of Cape Graeias a Dios. Honduras. 



Paratype. — An adult female 335 mm. in total length, 

 taken in the same haul with the holotype. 



Diagnosis. — Schroederichthys maculatus is 

 readily distinguished from sharks of all other gen- 

 era by the proportionately greater length of the 

 tail region. It differs from the other species of 

 Schroederichthys described in this paper in color, 

 in the shape of the nasal flap, which in S. macu- 

 latus is triangular with a somewhat bilobed distal 

 margin as compared to the narrower, longer flap 

 with a simple rounded tip of the other species. 

 The color differences are so great between the two 

 species of Schroederichthys that other differences 

 are of comparatively little interest for practical 

 identification of the two forms. S. maculatus has 

 a color pattern almost identical with that of Scyli- 

 orhinus torrei Howell-Rivero. The dorsal sur- 

 faces are tan or light brown with round, ovoid, or 

 irregularly shaped white or cream-colored spots 

 about 1 to 3 mm. in diameter scattered over the 

 dorsal surfaces except on the surfaces of the dorsal 



I 



—  — -*m — . — __ — 



Figure 16. — A, Schroederichtliys maculatus new species, drawn from the type, USNM 185556, a 328-mm. 

 adult male; B, Schroederichthys lenuis new species, drawn from the type, USNM 188052, a 230-mm. 

 immature male. 



REVIEW OF WESTERN ATLANTIC CAT SHARKS 605 



795-35S 0—66 6 



