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APPENDIX. 



The following Appendix contains descriptions of a few species, which were 

 omitted to be noticed in their proper places ; and further remarks with respect to 

 some, which will be found in the body of the work. 



Family.— PERCIM1. 

 1. Aphritis undulatus. Jen. 



Plate XXIX. fig. 1. 

 A. elongatus : lateribus supra pallide olivaceis, fasciis transversis abbreviatis, 

 lineisque longitudinaliter undantibus, nigris ; lateribus infra argenteis : pinnis dor- 

 salibus et caudali punctatis; pinnis, reliquis, et lined lalerali, albidis. 



B. 6; D. 8—25; A. 1/22 ; C. 14, et 6 brevioribus ; P. 22 ; V. 1/5. 

 Long. unc. 3. lin. 1. 



Form. — Elongated ; the depth about one-sixth of the entire length ; the thickness two-thirds of the 

 depth. Head four-and-a-half times in the length. Profile falling very gradually at first, but 

 more rapidly in advance of the eyes, causing the snout to appear rather obtuse. Mouth small: 

 maxillary slender, hardly reaching to a vertical line from the anterior margin of the orbit : 

 upper jaw slightly longer than the lower, and very protractile. Teeth very minute, forming a 

 narrow velutine band : a patch on the chevron of the vomer scarcely visible, but capable of 

 being very distinctly felt ; none apparent on the palatines. Eye one-fourth the length of the 

 head, and distant one diameter from the end of the snout ; the interocular space rather less 

 than the diameter. Snout slightly indented, or furrowed out in front of the eyes. A series 

 of impressions on the lower jaw, and along the limb of the preopercle, but much less obvious 

 than in the next species, and not distinctly porous. Preopercle with the ascending margin 

 vertical, the angle at bottom rounded; the limb broad and distinctly marked, with the 

 boundary line between it and the cheek slightly elevated into a ridge. The opercle, with its 

 membrane, produced backwards in an angle, the subopercle being visible beneath. The 

 branchial membrane six-rayed, and fastened to the isthmus underneath, the aperture com- 

 mencing beneath the ascending margin of the preopercle. 



Lateral line commencing at the upper angle of the gill-opening, and following the curvature 

 of the back at one-fourth of the depth, and preserving this direction throughout its course, not 

 2 



