1854.] 155 



SALMONID.*:. 



43. Argentina pretiosa, G. The body is gracefully elongated, compressed? 

 fusiform in its outline, six inches and one-third in total length, in which the head 

 enters for a little less than the fifth. The eye is large and circular, and its hori- 

 zontal diameter is contained a little over four times in the length of side of head. 

 The posterior extremity of upper maxillary extends to a vertical line which 

 would pass in advance of the pupil. The origin of dorsal fin is a little nearer 

 the tip of lower jaw than to the base of caudal fin. The adipose is situated op- 

 posite the posterior fourth of anal. The caudal is forked. Trie origin of ventrals 

 is placed a little behind the vertical line of anterior margin of dorsal ; the fins 

 are well developed. The pectorals are a little more slender and longer than the 

 ventrals. 



J) 11. A 13. C 10. 1. 9. 8. 1. 8. V 8. P 1-16. 



Scales of medium size. Upper region of head and back yellowish; outlines of 

 scales marked by minute blackish dots. Sides of head and middle of flanks 

 silvery, shining ; lower part of flanks and belly dull yellowish. 



From Presidio, Cal. 



PLEURONECTID^.. 



44. Flkusonectes maculosus, G. Body elongated, subelliptical ; dorsal and 

 ventral outline forming most regular curves into which the head immerges ante- 

 riorly with but a very slight depression above the eyes. The peduncle of the 

 tail is slightly contracted immediately behind the posterior margin of both the 

 dorsal and anal fins, which terminate evenly. From this point to the base of 

 caudal fin, the caudal region assume a dove tail shape. The caudal fin itself is 

 undulated posteriorly, the external and central rays being slightly longer than 

 the intermediate ones. The total length of the fish is about seven inches and a 

 b,alf, in which length the head enters four times and one third. The lower jaw 

 is the longest. The posterior extremity of upper maxillary reaches a vertical 

 line which would pass behind the posterior rim of the orbit. The eyes, placed 

 on the right side, are of medium size, elliptical, and their horizontal diameter is 

 contained about five times and a half in the length of the side of head. The 

 origin of dorsal is opposite the anterior rim of the orbit ; that of the anal is in 

 advance of the base of pectorals, as also the insertion of the ventrals, which are 

 short and broad. 



D 68. A 52. C 3. 1. 7. 6. 1. 2. V 6. P 1-10. 



Scales quite small, extending over the head and opercular apparatus. Anterior 

 arch of lateral line representing the section of a cupola in miniature. 



Ground color reddish brown, with numerous scattered spots of a much deeper 

 hup. 



From San Diego, Cal. 



45. Platichthysrugosus, Grd. Proc. Acad. Nat. Sc. Philad. vii. 1854, p 139* 

 Out of five immature specimens, two have the eyes situated on the right side, 



otherwise similar in every respect to those in which these organs are placed 

 upon the left. 



From Presidio, Cal. 



46. Parophrys vett;lvs, Grd. Proc. Acad. Nat. Sc. Philad. vii. 1854, p. 140. 

 From Presidio, Cal. 



47. Psettichthys sordidus, Grd. Proc. Acad. Nat. Sc. Philad. vii. 1854, p. 142. 

 Specimens, smaller than those formerly described, exhibit upon their body and 



fins irregular small black spots, in addition to the color elsewhere alluded to. 

 From Presidio, Cal. 



DISCOBOLI. 



48. Lepadogaster reticulatus, G. Head broad, semielliptical when viewed 

 from above; upper surface declive towards thesideSj as well as towards anterior 

 extremity. It forms nearly the third of the entire length, which, in ihe speci- 

 men described, is about three inches and a half. Its inferior surface is dattened. 



