652 MR. R. H, BURNE ON THE ANATOMY OF THE [May 25, 



In Hij^i^oglossus and Pleuronectes both sacs are present and 

 well developed on both sides of the face. In Rhovibus the 

 lachiymal sac is absent on the blind side, and in Arnoglossus on 

 both sides. In the Sole the lachrymal sac is more developed 

 than the ethmoidal, and is present on both sides, being particularly 

 large on the blind side, the ethmoidal sac, or rather an indication 

 of it, occvirring only on the ocular side. 



SCLEROPAREI. 

 TRIGLIDiE. 



Trigla Mrimido. 



The nostrils lie in an area of soft skin surrounded by scutes, 

 high up on the face, slightly more than halfway from the eye to 

 the point of the snout. The anterior nostril is a small round 

 aj)erture surrounded by a low tubular lip. The posterior is 

 separated from it by a bridge some few millimetres in breadth, 

 and has the form of a vertical slit valved against inflow by special 

 membranous flaps attached to the inner surface of each of its lips. 



The olfactory chamber occupies the usual position with regard 

 to the bones of the face, being lodged in a hollow between the 

 maxillary process of the palatine in front and the eth mo-lachrymal 

 articulation. It contains a clearly defined oval rosette consisting 

 of from thirty to forty laminfe with gently convex free borders 

 arranged as usual around a linear axis. 



Above and below the rosette the nasal cavity is extended 

 to form a pair of accessory sacs, which have the position and 

 arrangement common to the lachrymal and ethmoid sacs of other 

 Acanthopterygians. The lachrymal sac spreads out into the 

 hatchet- shape presented by that of Capros, reaching in front to 

 the maxilla, and backwards upon the jaw muscles. Both sacs 

 are compressed by the bones of the jaws as the mouth is closed. 



CYCLOPTERIDiE. 



Cyclojyterits luvijms. 



The olfactory organ is in every way more extensive than 

 that of Trigla. The nostrils lie very high up on the head, the 

 anterior slightly in front of the eye above the level of its 

 upper border, the posterior some considerable distance further 

 back about halfway between the anterior border of the eye and 

 the dorsal mid-line of the head. Both nostrils are circular, 

 the anterior slightly the larger of the two, and situated at the 

 end of a short conical tube ; the posterior a mere pin-hole, valved 

 against ingress by the thinness of its slightly protuberant lips. 



The olfactory cavity is occupied by a circular rosette, consisting 

 of about fifteen feeble laminse radiating from a central boss, which 

 lies directly below the anterior nostril. The hinder part of the 

 chamber is prolonged backwards as a smooth tubular passage 

 to the posterior nostril (cf. Mullus, Solea), and above and below 



