258 Memoir Sears Foundation for Marine Research 



78.9, 78.4; pectoral 22.7, 22.O5 pelvics 49.0, 45. 4j anal 68.5, 65.7. 



Intersface between: ist and 2nd dorsals 17.7, i7-i; 2nd dorsal and caudal 8.7, 



8.4; anal and caudal S-(>y 4-6. 



Distance from origin to origin of: pectoral and pelvics 26.9, 24.5 ; pelvics and anal 



19.2, 20.4. 



General form much as in canis. Dermal denticles more loosely spaced, with notice- 

 ably weaker sculpture, usually with only 2 ridges, and these as a rule confined to the ante- 

 rior basal half of the blades, the latter so transparent that the outlines of the pedicels are 

 visible from outside. 



Head more flattened above than in canis and relatively much longer, its length to 

 origin of pectoral about equal to distance from rear base of ist dorsal to midbase of 2nd 

 dorsal. Snout in front of mouth a little more than V2 as long as pectoral (considerably 

 shorter than that in other western Atlantic species), more narrowly ovate than in canis. 

 Eye relatively small, its horizontal diameter only about V4 to Vs as long as snout in front 

 of mouth. Spiracle a little less than Y2 as long as horizontal diameter of eye. Third gill 

 opening a very little longer than horizontal diameter of eye, the 4th about over origin of 

 pectoral. Anterior margin of nostril with a well marked rounded lobe. Mouth a little less 

 than V2> or about 45%, as high as broad. Upper labial furrow about 70% as long as dis- 

 tance between nostrils, the lower furrow about % as long as upper. 



Teeth nearly symmetrical, with evenly convex cutting edges. 



First dorsal about as long at base as along anterior margin, the posterior margin only 

 very weakly concave (much less so than in canis or norrisi), its origin a little posterior to 

 axil of pectoral, the midpoint of base about midway between origin of pelvics and axil 

 of pectoral. Interspace between ist and 2nd dorsals about as long as from snout to ist gill 

 opening. Second dorsal between % and % as long as ist at base and about % as high, its 

 origin about midway between tips of pelvics and origin of anal. Caudal with lower anterior 

 corner considerably more obtuse than a right angle, not expanded as a definite lobe. Anal 

 about % as long at base as 2nd dorsal, its origin about under midpoint of base of latter. 

 Pectoral a little less than %, or about 60%, as long as head, with nearly straight distal 

 margin and very broadly rounded inner corner, the distal margin only a little shorter 

 (about 75-90%) than outer margin. 



Color. Described^" as "back brown with narrow transverse bands of darker, separated 

 by spaces of about equal width: one or a pair crossing the orbits, one across the spiracles, 

 one on the nape, four between the nape and the dorsal, four or five on the base of the 

 dorsal, six between the dorsals, three on the base of the second dorsal, and two or three 

 between it and the caudal. A yellow spot in front of each eye above each orbit. Fins dark 

 with narrow edgings lighter. Lower surfaces whitish. On a larger individual pairs of bands 

 are more or less confluent and all are more indefinite, indicating a probable loss of the 



36. Garman (Mem. Harv. Mus. comp. Zool., 515, 1913 : 173), perhaps from field notes from the "Thayer" Expedi- 

 tion on which the specimens were collected. 



