1. DITREMA. 247 



does not extend to the vertical from the front margin of the eye. 

 Lips rather thick, the fold of the lower being interrupted in the 

 middle. Caudal deeply forked. 



a. Adult. San Francisco. From the Boston Museum. 

 5. Ditrema toxotes. 



Rhacochilus ioiiotes,Aqass.Am.Journ. 1854, p. 367, &nAProc.Bost. Soc. 

 Nat. Hist. 1861, p. 130 ; Girard, Proc. Acad. Nat. Sc. Philad. 1856, 

 p. 136, and U.S. Pacif. P.P. E.vp. x. Fishes, p. 188. pi. 40. 



Pachylabrus variegatus, Gibbons, Proc. Ac. Nat. Sc. Philad. 1854, p. 126. 



D. ii. A. ^. L. lat. 73. L. transv. 11/21. 



The dorsal spines slightly increase in length posteriorly, but are 

 considerably lower than the anterior rays. Scales on the cheek in 

 six or seven series. The height of the body is contained t\vice and 

 two-fifths in the total length (without caudal). Jaws subequal an- 

 teriorly ; lips thick, the fold of the lower continuous round the jaw. 



a. Adult. San Francisco. From the Boston Museum. 

 6. Litrema furcatum, 



Phanerodon furcatus, Girard, Proc. Acad. Nat. Sc. Philad. 1854, p. 153 ; 

 1855, p. 322, and U.S. Pacif. P.P. Exp. x. Fishes, p. 184. pi. 34. 

 figs. 1-5. 



^- ^- ^- k- ^- 1^*- 6^- ^- transv. 5/14. 

 The dorsal spines increase in length posteriorly, the last being not 

 much shorter than the fii-st ray. Scales on the cheek in three series. 

 The height of the body is two-fifths of the total length (without 

 caudal). Jaws equal in length anteriorly ; the fold of the lower lip 

 is interrupted in the middle. 



a. Adult. San Francisco. From the Boston Museum. 



7. Ditrema caryi. 



Embiotoca (iwy\,Agass. Am. Juurn. xvi. 1853, p. 389; xvii. 1854, p. 366. 

 Holconotus gibbonsi, Calif. Acad. Nat. Sc. in Proc. Acad. Nat. Sc. Philad. 



1854, p. 121. 

 Hypsurus caiyi, Agass. Proc. Post. Soc. Nat. Hist. 1861, p. 133. 



D.^^. A.^. L. lat. 71. L. transv. 7/18. 



The middle dorsal spines are a little longer than the posterior, and 

 shorter than the anterior rays. Scales on the cheek in three series. 

 The height of the body is 'two-fifths of the total length (without 

 caudal). Upper jaw a little longer than the lower. Lips rather 

 thick, the fold of the lower being interrupted in the middle. The 

 maxiUary does not extend to the vertical from the front margin of 

 the orbit. 



a. Adult. San Francisco. From the Boston Museum. 



