678 Bashford Dean Meynorial Volume 



Authors agree that in H. quoyn the origin of the first dorsal is well behind the root of 

 the pectoral. Garman states that the dorsal fins are of moderate size, with convex hind 

 margins; the base of the anal fin is two-thirds its length distant from the caudal; and the 

 anterior gilhopening is more than twice as "vvade" as the hindmost. Freminville states 

 that the skin is entirely shagreened, is colored a ruddy-brown and is everywhere strewn 

 with dark'brov^m spots, generally round. Concerning the coloration of H. quoyi Garman 

 (1913) writes: 



Back rusty-brown, yellow below, -^^th scattered spots of black, from mere specks to 

 spots as large as the orbit or larger, over the entire body and fins. Ckimmonly the spots show 

 a tendency toward grouping in twos and fours ; in [some] cases they are more confluent. On 

 some [specimens] there are five or six rather indefinite transverse bands of darker separated by 

 spaces of equal width; a band crosses the nape, another hes in front and a third behind the 

 first dorsal, one in front and one behind the second dorsal and one in front of the caudal. 

 A darker area extends from each orbit across the cheek. 



It remains to record some observations on two specimens of H. quoyi, from the col- 

 lections of the American Museum of Natural History, which I have been permitted to 

 examine. The larger specimen is a female about 527 mm. (20.75 inches) long, measured 

 after 20 years' immersion in alcohol. It is probably adult or nearly adult. This specimen 

 u^s collected on January 5, 1920, by Dr. R. C. Murphy, on the Lobos de Afuera Island 

 (ofi^ the coast of Peru) where it v,"as u-ashed ashore in a dying condition. The other 

 specimen is a male only 372 mm. (14.6 inches; long, and evidently very young. It was 

 taken on June 9, 1925, by Dr. R. C. Murphy at Albemarle Island of the Galapagos group, 

 from the stomach of a Tiger Shark (Galeocerdo). It seems in good condition after 15 

 years" preservation in alcohol. Concerning these specimens it is necessary to consider 

 here only a few external characters, particularly those relating to the form of the body. 

 Certain details, including additional measurements, are left for a later section of the present 

 article entitled "Comparisons of H. quoyi and H. francisci''\ 



In the absence of pubHshed drauTngs of either dorsal or ventral views of H. quoyi 

 one is immediately impressed, upon examining these specimens, by the breadth of the 

 head and by the flatness of the ventral surfaces of both head and body. The outline of 

 the entire body, viewed from above, is quite tadpole-like. In the adult female the head 

 is much broader, proportionally, than in the young male. The head height of the young 

 male is greater, proportionally, than the head height of the adult female. In both speci- 

 mens the body height is greatest immediately in front of the first dorsal fin, where it 

 exceeds the height of the head sufiiciently to give the fish a humpbacked appearance. In 

 its middle third, the supraorbital ridge is low and broad. In both specimens, this portion 

 is merely a told of the skm not supported by the endoskeleton. In both specimens, the 

 external spiracular openings are small, measuring from 2 to 3 mm. in their larger diameters. 

 The first gill-sht is about twice, the length of the fifth. The origin oi the first dorsal is well 

 behind the posterior end of the pectoral base. The base of the anal fin is about three-fourths 

 its length from the caudal. 



