204 AMERICAN JOURNAL 



REMARKS ON NUDIBRANCHIATA INHABITING THE 



PACIFIC ISLANDS, WITH DESCRIPTIONS OF 



TWO NEW GENERA. 



BY W. HAEPER TEASE. 



Genus GONIOBRANCHUS, Pease. 



Description. — Corpus, depressum, oblongo-ovale, subgelati- 

 nosum ; pes elongatum, postice ultra pallium extensum ; ten- 

 taculas cervicales, retractilis, laminatis ; branchiis simplicis, 

 linearibus, elongato-lanceolatis, quadrangularis, transverse 

 laminatis, retractilis, interdum bifurcatis. 



Remarks. — The chief peculiarity of this genus is the form 

 of its branchiae; they are simple, linear, of an elongate lance- 

 olate shape, and quadrangular, usually slightly compressed, so 

 that two sides are rather wider ; those sides are finely and 

 delicately laminated. The branchiae are united at their base, 

 and on one species bifurcate. To this genus should be referred 

 Doris vibrata, Pse., propinquata, Pse., and pncta, Pse., Proc. 

 Zool. Soc, 1860; also Doris pulchra, Pse., Proc. Zool. Soc, 

 1861. The branchiae of the first three were described as being- 

 ciliated on their edges. On close examination of larger spe- 

 cies, the cilia? prove to be the extension of the laminae beyond 

 the edges; consequently those descriptions should be corrected 

 to read "laminated," instead of "ciliated." 



We add two new species as follows : — 



GONIOBRANCHUS ALBOMACULATUS, Pse. 



Description. — Animal elongate oval, convexly depressed ; 

 mantle rounded at either end, rather the widest at the middle, 

 upper surface covered with depressed tubercles of irregular 

 shape and size, and of a whitish color. Margins of the mantle 

 thin and slightly gashed, anteriorly slightly dilated when in 

 motion ; cervical tentacles, arising from short, swollen bases, 

 are large, elongate, cylindrical, tapering to acute tips, some- 

 what obliquely, delicately laminated ; labial tentacles cylindri- 

 cal, finger-shaped, rather long; branchiae suberect, six or 

 seven in number, rather large, retractile into a tubular cavity, 

 lamince fine and close ; vent central, consisting of a short coni- 



