FISHES OF FAMILY BLENNIIDAE 19 



Musgravius Whitley, 1961, Proc. Roy. Zool. Soe. New South Wales, 1958-1959, 

 p. 177 (type-species: Pescadorichthys (Musgravius) laudandus Whitley, 1961, 

 by original designation and monotypy) . 



Nemophis Kaup, 1858, Proc. Zool. Soc. London, 1858, pt. 26, p. 168 (type- 

 species: N. lessoni Kaup, 1858, =Xiphasia setifer Swainson, 1838, by mono- 

 typy). 



Oncesthes Jordan and Hubbs, 1925, Mem. Carnegie Mus., vol. 10, no. 2, p. 319 

 (type-species: Petroscirtes fluctuans Weber, 1909, by original designation and 

 monotypy) . 



Ostreoblennius Whitley, 1930, Mem. Queensland Mus., vol. 10, no. 1 (type- 

 species: Petroscirtes (Ostreoblennius) steadi Whitley, 1930, by monotypy). 



Petroscirtes Rtippell, 1830, Atlas Reise nordlichen Africa, vol. 1, Zoology, pt. 16 

 (type-species: P. mitratus Rtippell, 1830, by monotypy ; frequently misspelled 

 "Petroskirtes" in the literature). 



Plagiotremus Gill, 1865, Ann. Lye. Nat. Hist. New York, vol. 8, p. 138 (type- 

 species: P. spilistius Gill, 1865, by monotypy). 



Runula Jordan and BoUman, 1890, Proc. U.S. Nat. Mus., vol. 12, p. 171 (type- 

 species: R. azalea Jordan and BoUman, 1890, by original designation and 

 monotypy) . 



Xiphasia Swainson, 1839, Classiiication of fishes, amphibians, and reptiles, vol. 

 2, p. 259 (type-species: X. setifer Swainson, 1839, by monotypy, based on 

 Russell, 1803, no. 39). 



Xiphogadus Giinther, 1862, Catalogue of the fishes of the British Museum, vol. 

 4, p. 374 (type-species: Xiphasia setifer Swainson, 1839, by monotypy; a 

 junior objective synonym of Xiphasia Swainson, 1839) . 



Osteology of Entomacrodus nigricans 

 Head Region 



Median ethmoid (fig. 1). — The median ethmoid has a flat anterior 

 face and is paddle-shaped, tapering dorsally. The dorsalmost margins 

 of the bone are bounded laterally by the anteroventralmost extensions 

 of each frontal; most of the remaining margins are bounded by the 

 lateral ethmoids; the ventrolateralmost margins impinge on the 

 vomer. The posterior face of the ethmoid forms the anterior surface 

 of a large cupshaped cavity at the internal anterior end of the skull 

 (anterior myodome). The lateral margins of the cavity are bounded 

 by thickened mesial projections of the lateral ethmoids, and the 

 ventral margin is bounded by the dorsal surface of the vomer. Ven- 

 trally the median ethmoid joins the small plugshaped ethmoid car- 

 tilage, which inserts in a deep depression in the anterior surface of 

 the vomer. 



Lateral ethmoid (figs. 1-4, 7). — ^Each lateral ethmoid joins dorsally 

 and externally the anterolateral siuface of its respective frontal, 

 ventrally the ethmoid, and posteroventrally and mesially the lateral 

 ethmoid of the opposite side. Anteriorly the lateral ethmoids are 

 f anshaped, each with a large foramen for the oKactory tract opening 

 close to the surface joining the frontal. The ventral surface of the 



