U9 

 8. Tliecacera, Fle.m. 



Alder aad Hang., Mouogr. part VI. 1854:. fam. 1. gen. 5; part Vll. 1855. pag. 44. 

 fam. 1. pl. 21a, pl. 46 supplem. fig. 18 — ^19. 



Coi'pus limacif or mc, fere laeve, limbo frontali angusto, laevi vel tuberculato; 

 rhinophoria vagiuis obliquis fortitei" prominentibus retractilia, clavo perfoliato; 

 brancHa paucifoliata, foliolis tripinnatis, in quoque latere dorsi appendix lobiformis 

 extrabranchialis singula vel appendices complures, tuberculiformes ; tentaeula vlx ulla. 

 Margo anterior podarii angulis productis. 



Lamellae mandibulares fere ut in Polyceris (propriis). Radula non lata; 

 rhachis nuda ; plcuris non multidentatis, dentibus laterallbus iiiajoribus duobns inaequali- 

 bus et dentibus externis conipluribus. 



Glans penis? 



1. Th. pennigera (Mtg.). 



M. atlant. 



2. Th. virescens, Ald. et HanC. 

 M. atlant. 



3. Th. capitata, A. et H. 

 M. atlant. 



4. Th. sp. (Darwin') '). 



M. pacific. (Chomos-Archip.). 



9. Poljcerella, Verrill. 



A. E. Verrill, notice of recent addit. to the marine invertebr. of the northeastern 

 coast of America, part IL Proc. of Un. Stat. Xat. Mus. III. 1881. 

 pag. 386—388. 

 — , catal. of marine Moll. Trans, of the Connecticut Ac. V, 2. 1882. 



pag. 548. 



Forma corporis fere ut in Polyceris, sed dorsum papilliger um; rhino- 

 phoria non retractilia, clavo s i m p 1 i c i : branchia paucifoliata, foliolis simpliciter 

 pinnatis ; tentaeula vix ulla ; margo anterior podarii angulis productis. 



Lamellae mandibulares fere ut in Polyceris. Eadula augusta; rhachis nuda; pleurae 

 tridentatae, deute laterali majori et dentibus externis duobus simplicibus hamatis. 

 Glans penis armata. 



1. P. Emertoni, Verrill. 

 M. atlant. occ. 



1) VergL Alder and Hancock, \. c. part VI. 1S54. fam. 1. gen. ö. 



Ferner sind noch zwei von Moqüin-Tasdon (A. Fbedol, le monde de la mor. 1864. pL XII. Fig. 3—1) dargestellte 

 ^Polveeren' wahrscheinlich Thecaceren. 



