936 CONTRIBUTIONS TO NORTQ AMERICAN ICHTHYOLOGY IV. 



The character of "lower pharyngeals united" has little importance 

 ill this group. In Gerres jylumieri, as in nearly- all the species examined 

 by us, the bones are not at all co-ossified, altho^,»gh very close together. 



Page 58G. '■'■ Ditrema molaceum^^ Button, from New Zealand, is a Scoin 

 broid fish, and not an Embiotocoid. 



Page 590. The genus Holconotus Agassiz should be recognized for 

 those species of Amphisticlms which have the lower lip without frenum, 

 and Brachyistius Gill for those of Micrometnis, which have the frenuiv.. 

 No. 930 should stand as — 

 930. II. ar^eiiteus (Gibbons) J. & G. 



Page 600. Instead of Tautoga read : 



316,— HIATULA Lac^pMe. 



(Lac^pede, Hist. Nat. Poiss. ii, 523, IHOO: type Lahrus Matula L.=Hiatula gardeni 

 Lac.) (Latin, hiatus, a gap.) 



Instead of Tautoga onifis read : 

 942. M. OBiitBS (L.) J. & G. 



Page 600, Add to the synonymy of M. oiiitis — 



(Lahnis hiatula L. Syst. Nat.: Lahrus hiatuhi Gmelin, Syst. Nat. 1287, 1788: Hiatula 

 tjardeniaiia Lacepede, Hist. Nat. Poiss. ii., 523, 1800; the genus and species, based on a 

 specimen of Tautog wliicli bad in some way lost the anal fin ; this specimen seems 

 to have been sent from Charleston by Dr. Garden to Linnaeus. If MicrojHerus and 

 other generic names, based on abnormal or mutilated specimens, be adopted, we must 

 substitute Hiatula for Tautoga.) 



Page 602. Instead of aa, etc., read: 



318 (/'). — TKOCHOCOPUS Giinther. 

 (Giinther, Cat. Fish. Brit. Mns. iv, 100, 18G2: type Trochocopus opercularis Gthr.) 

 This group is distinguished from Harpe by the smaller scales (Lat. 1. 

 45 to 65), which scarcely encroach on the bases of the soft dorsal and 

 anal. In the present; classification of the Lahndce, this groa[) may be 

 recognized as a distinct genus, altbough diftering from Ilarpe in no re 

 spect of iin])ortance. Species few. {r/xj/o-^ a running; xw-/^, oar.) 



945. T. pBuScRBer (Ayres) Garman. 



Page CAYS. l*^or Pla-tyglofisus grandisqiianm and P. humeralis lead: 

 947 (94§). P. B»ivitt^tus (Hloch) Gthr. 



This species seems to be widely distributed, and varies considerably 

 with age and sex. The following is a description of the young {'■^flore- 

 iiliii^''), supposed by us at first to belong to a different species: 



Olive-brown; a greenish stripe along side of back; a dark-brown 

 lateral band from gill-opening to middle of caudal, on level of eye; a 



