FRESH-WATER FISHES OF SIAM, OR THAILAND 433 



dispar is included, although their figure, showing noteworthy en- 

 largement of only the sixth ray, is considered by Mohr as representing 

 Z. hrevirostris. The two forms are otherwise very similar, both hav- 

 ing some of the dorsal rays in the male thickened and lengthened, 

 and both having the upper jaw and the ratio of its length to the length 

 of the lower jaw essentially the same. 



The specific name hrevirostris is not available for the zenarchopterid 

 fish so called by Giinther, Mohr, and others. The name Hemirham- 

 phus hrevirostris given by Giinther (1886, vol. 6, p. 274) to a new 

 species was a pure homonym for Hemirainphiis hrevirostris Cuvier 

 and Valenciennes (1829, vol. 2, p. 286, footnote), based on the descrip- 

 tion and plate published by Eussell (1803, p. 61, fig. 177). Russell 

 erroneously identified his fish, the Jcuddera of the Coromandel natives, 

 with the American species Esox hrasiliensis Linnaeus.'^ 



For the fish thus left without a valid name, the name gilli is now pro- 

 posed, in memory of Dr. Theodore Gill, who established the genus 

 Zenarchopterus in 1863. 



Z. gilli bears the same vernacular name {pla hatwng heo) as Z. 

 ectuntio. No distinctive information has been recorded regarding its 

 abundance, habits, and size. 



ZENARCHOPTERUS DUNCKERI Mohr 



Zenarchopterus dunckeri Mohb, 1926a, p. 257 (New Guinea, New Pomerania, New 

 Mecklenburg, Amboina). — Fowlee, 1987, p. 214, fig. 192 (Rayong). 



The inclusion of this species in the Thailand fauna is based on a 

 notice by Fowler of eight specimens, 7.5 to 14 cm. long, taken at Rayong, 

 a fishing town on the coast of Southeastern Thailand. The fish is 

 known otherwise from New Guinea, the Bismarck Archipelago, and 

 the Dutch East Indies. According to Mohr, who described this fish 

 in 1926, the club-shaped fourth dorsal ray in the male is greatly en- 

 larged and elongated and may touch the back posteriorly to the fin, 

 and the sixth anal ray is enlarged and thickened and may be two to 

 three times as long as the adjoining rays. 



A maximum length of 17.5 cm. is reported for New Guinea. 



ZENARCHOPTERUS PAPPENHEIMI Mohr 



Zenarchopterus pappenheimi Mohr, 1926a, p. 258, 1 fig. (Bangkok). 



This species was based on specimens, found in some Berlin Museum, 

 that had been collected in Bangkok at a time and by a person not indi- 

 cated in the specific description. The material consisted of three males, 

 16 to 16.8 cm. long. A male, 19.3 cm. long, collected in the Andaman 



'Singularly enough in Cuvier and Valenciennes (1846, vol. 19, p. 32), Cuvier's Hemi- 

 ramphus hrevirostris was rejected, partly because the specific name was inappropriate, 

 and a new species, Hemiramphus russellij was described, based on Russell's kuddera and 

 his plate as cited by Cuvier. 



