3T6 POLYCERID^. 



Rhinophores laminated, retractile. Foot narrow. Oral aper- 

 ture armed. Odontophore with numerous minute spines, none 

 median. 



KALiNGA, Aid. and Hanc, 1864. Body oval, subprismatic. 

 Margin of mantle most developed in front, where there is a row 

 of close-set papillated processes extending over the head ; a few, 

 similar processes are upon the sides of the back. Rhinophores 

 laminated. Oral tentacles flattened. Branchiae non-retractile, 

 placed separately in a circle at some distance around the anal 

 opening. Odontophore broad, with numerous rather distant 

 rows of tricuspid spines. No jaws or collar.' Distr. — G. ornata^ 

 A. and H. Coromandel Coast. 



Triopa, Johnston, 1838. 



Syn. — Tritonia, Lam., 1801. Themisto, Oken (part), 1815. 

 Euplocamus, Philippi, 1836 (part). Cadophora, G-ray, 1840. 



Diatr. — 9 sp. Universal. T. claviger^ Miill. (xc, 3). 



Body more or less depressed ; mantle small, covering the head, 

 the margin with linear subclavate or branched appendages ; 

 rhinophores laminated ; oral tentacles cylindrical or ovoid ; 

 branchiae few, non-retractile. Odontophore broad, with numerous 

 plates, the two or three inner ones with large spines, none 

 central. 



Triopa was instituted by Johnston for the Doris clavigera of 

 Miiller. Messrs. Alder and Hancock proposed to retain as well 

 the genus Euplocamus for E. croceus, Philippi. The differences 

 between the two genera, however, appear to be more of degree 

 than kind, and serve better for distinguishing sections of one 

 genus; moreover the latter name is in general use for a genus of 

 insects as well as for a genus of birds. Euplocamus originally 

 took in the Idalise. Oken's Themisto included Polycera quadri- 

 liyieata and Triopa clavigera. 



LATERiBRANCHi^A, Stcams. Animal like Triopa, with a single 

 series of gills on each side, central or subcentral and opposite. 

 L. f estiva, Stearns. California. 



Triopella, Sars. 



Distr. — T. incisa^ Sars. Norway. 



Distinct from Triopa by the broad mantle, which is bilobed 

 behind, and has two longitudinal ridges on the back ; radula like 

 that of ^girus. 



Triopha, Bergh, 1880. 



Di^tr. — T. Garpenteri, Stearns. W. Coast of America. 



Distinguished from Triopa by nodose or shortly ramose dorsal 

 appendages and ear-shaped lower tentacles ; five tripinnate 

 branchial plumes ; mouth with two strong horny plates. Radula 

 with 3-4 lateral and 10-11 external (uncinal) plates on each 

 side. 



