op coxcriOLOGY. 205 



cal tube ; foot elongate oblong, transversely fissured in front ; 

 genital organs on the right side, a short distance posterior to 

 the cervical tentacles. Color orange-yellow, margin bright 

 violet, shading off into the ground color, tubercles whitish, 

 cervical tentacles, branchiar, and under surface cream white. 

 Length 2 inches. 



GONTOBRANCHUS RETICULATUS, Pse. — t. 1-i, fig. 1. 



Description. — Animal oblong- oval, mantle depressly convex, 

 widest at the middle, similarly rounded at either extremity ; 

 margins thin, entirely covering the foot, the upper surface 

 covered with remote, indistinct, small, depressed tubercles; 

 cervical tentacles small, oblong-ovate, obliquely laminate and 

 retractile into simple cavities ; labial tentacles cylindrical, 

 tapering; branchiae small, suberect, twelve in number, two or 

 three bifurcate, retractile iuto a simple cavity ; vent consisting 

 of a simple, slightly prominent orifice. Color cream- white, 

 upper surface of the mantle minutely reticulated with brick- 

 red lines, margined with orange and a white submarginal 

 narrow band; tentacles brown, edges of the laminar pare 

 white ; labial tentacles tipped with orange ; branchiar cherry- 

 red, under surface watery white ; mantle and foot margined 

 with orange. 



Length 2 \ inches. 



Genus STENODORIS, Pease. 



Description. — Corpus elongatum, angustum, non palliatum, 

 antice cuspidatum, postice compressum, attenuatum, posteriorc 

 tentacular utrinque oblique incisum, dorso rotundate convexo; 

 branchiar parvis, plurnosar, bipinnatis, subretractilis, postice in 

 linea media dorsi anum circumdantes; tentacular cervicales, 

 anteriore, vix compressis, ovatis, oblique lamellatis, subretrac- 

 tilis ; pes angustus, elongatus, antice truncatus, ora utrinque 

 lobata ; oculis distinctis, ad basin tentacular. 



This genus is of very simple form ; the body is soft, nar- 

 row, elongate, tapering to a point anteriorly, posteriorly com- 

 pressed and elongate, no mantle or lateral fissure ; testacies 

 far anterior, a short distance behind them the body is deeply 

 incised on either side, thus forming a cephalic disk; they are 

 closely approximating, of an ovate form, obliquely lamellated 

 and subretractile into simple orifices ; branchiae small, sub- 

 retractile, bipinnate, posterior to the middle, surrounding the 

 vent ; mouth between the locomotive and cephalic disks and 

 provided with a pair of lobes ; foot truncate in front, extend- 

 ing to the posterior end of cephalic disk ; eyes appear to be 

 immersed in the bases of the tentacles. 



