68 BULLETIN 18 8, UNITED STATES NATIONAL MUSEUM 



February-March 1927, and subsequently presented to the Siamese 

 Bureau of Fisheries. 



Both of these examples were unmistakably referable to this species, 

 having, among other characters, the origin of the dorsal fin immedi- 

 ately opposite the anal opening and the angle of the mouth extending 

 well behind the eye, 



A third and only other known specimen from Thailand is recorded 

 by Fowler (1939) ; it was 63 cm. long and collected September 21, 

 1936, at Krabi, in Peninsular Thailand. 



Family MURAENESOCIDAE : Eels 



Genus MURAENESOX McClelland 



Muraenesox McClelland, Calcutta Journ. Nar. Hist., vol. 4, p. 408, 1843. (Type, 

 Muraenesox tricuspidata McClelland.) 



MURAENESOX CINEREUS (Forsk&l) 



Muraena cinerea FobskAl, 1775, pp. 10, 22 (Arabia). 



While this widely dispersed eel of the Pacific and Indian Oceans is 

 common in the coastal waters of Thailand, it may also be found at 

 times, but apparently very rarely, in the lower courses of the large 

 rivers in water that is perfectly fresh, as in the Menam Chao Phya 

 as far up as Nontaburi, some miles above Bangkok. Von Martens 

 (1876) reported the fish from Bangkok, but his was a market specimen. 

 Fowler (1939, p. 43), under the name Muroenesox arabictts, lists a 

 specimen 80.5 cm. long from Krabi in Peninsular Siam but does not 

 indicate whether from salt or fresh water, 



A name borne by this fish around the head of the Gulf of Siam is 

 pla manglcorn (dragon fish). 



Family OPHICHTHYIDAE: Snake Eels 



Genus PISOODONOPHIS Kaup 



PisoodonopMs Kaup, Catalogue of the apodal fish in the collection of the British 

 Museum, p. 15, 1856. (Type, Pisoodonophis cancrivorus Richardson.) 



PISOODONOPHIS BORO (Hamilton) 



Ophisurus horo Hamilton, 1822, pp. 20, 363 (estuaries of the Ganges near Cal- 

 cutta). 

 Pifioodonophis loro Hora, 1923b, p. 173 (Nontaburi).— Smith, 1930, p. 57 (Siam). 

 Pisodonophis l)oro Fowleb, 1935a, p. 96 (Bangkok). 



Wliile this is a marine species, it has the regular habit throughout 

 its wide range (East Indies, China, Indo-China, Thailand, and India) 

 of entering brackish and fresh water and ascending streams. In 

 Thailand it is the common eel of the Menam Chao Phya Basin and 



