THE SHORE FISHES OF PERU 115 



The specimens are all immature and vary only from about 53 to 59 

 mm. (46 to 51 mm. to base of caudal) in length. The Galdpagos 

 specimens consist of two lots, one of five specimens taken "at anchor- 

 age," near Charles Island, by the Pinchot Expedition to the South 

 Seas, and another of two specimens also taken "at anchorage," at 

 Marchena (Bindloe) Island, by W. L. Schmitt. The Colombian 

 specimen too was collected by Dr. Schmitt, and was caught in Octavia 

 Bay, "in 2 fathoms." 



Although the specimens are all scaleless, and void of general pig- 

 mentation, and the intestine is not fully invaginated, the fins are well 

 developed, and the teeth are arranged about as usual in the genus. 

 If the development of the young is similar to that of S. joetens (Lin- 

 naeus), of which a series is before me, the body in the inomature 

 specimens herein described will increase in proportionate depth, the 

 head will diminish slightly in length, the proportions of the eye and 

 snout will remain about the same, and the width of the interorbital 

 will increase rather greatly. If a similar development should take 

 place the species represented by the young forming the basis for this 

 account would always be characterized by a short head, large eye, 

 short snout, and a broad interorbital. 



Figure 25. — Synodus marchenae, new species. From the type, 58 mm. long, Marchena 

 Island, Galapagos (U.S.N.M. No. 120171). 



The lot of five specimens taken by the Pinchot Expedition were 

 recorded as S. japonicus (see reference to Fowler above), a widely 

 distributed species in the South Seas. However, they cannot be of 

 that species as a specimen from Rose Island, only 57 mm. long, already 

 is completely scaled and fully pigmented, and furthermore it and 

 larger ones differ in several proportions, although the number of fin 

 rays and cross bands on the back is correct. ^S*. lacertinus Gilbert, 

 recorded from Panama Bay, also agrees in the number of fin rays, 

 but it too becomes adult at a much smaller size, a specimen 58 mm, 

 long being completely scaled and fuUy pigmented. At that size S. 

 lacertinus has a much larger head (3.8 in length), larger mouth (pre- 

 maxillary 1.6 in head), and a much narrower interorbital (12.5 in 

 head). 



As the specimens at hand do not seem to be identifiable with any 

 known species, I propose for them the name S. marchenae after the 

 island where the specimen selected as the type (U.S.N.M. No. 120171) 



