112 PROCEEDINGS OF THE ACADEMY OF [1880. 



TEIOPHA, Bergh, n. gen. 



Forma corporis fere ut in Triopis, sicut quoque margo fronta- 

 lis ; margo dorsalis appendicibus nonnullis nodosis vel breve 

 ramosis. Tentacula eompresso-poculiformes (auriformia) ; rhino- 

 phoria retractilia, clavo perfoliato. Branchia quinqnefoliata, 

 foliis tripinnatis. 



Os lamellis dnabus fortioribus e baculis rainutis eompositis 

 armatum. Lingua rbachide dentibus spuriis (4); pleuris denti- 

 bus lateralibus 3-4 (corpore processu alaiformi et hamo ap- 

 planato instractis) et serie dentium externorum (10-11) armatis. 



Prostata ? 



This interesting form, that forms a link between Polycera 

 and Triopa on one side, and the Euplocami on the other, ap- 

 proaches more nearly to the latter than to the former. 



In the exterior, the Trioph(E^ resemble the Trio'pce^ but still 

 differ in some points sufflcienth'. The appendices of the back 

 are more composite ; the tentacles seem different from those of 

 the Triop<e (which have them folded lengthwise and obtuse at 

 the end; see for comparison, PL XV, fig. 12); they are com- 

 pressed cup-shaped or auriculate. The gill contains five leaves. 

 Whilst the Triojoce want an armature of the true mouth, ^ the 

 Triojphce are provided with two strong plates (composed of 

 densely set staffs). Whilst the rhachis of the tongue in the 

 TriopcB is naked, the Trio2:)hce show four false plates, ("bosses" of 

 Dall, simple thickenings of the base membrane of the radula), 

 here ; instead of the two peculiarly formed lateral plates on the 

 pleural in the Triopa^ the Triophm have three or four lateral 

 plates (with a wing-like process of the bod}^ and a depressed 

 hook) ; with, on the outside of these, a series of (ten to eleven) 

 uncinal plates, nearly as in the Triopce. After all, the Triophce 

 are closely allied to the Colgce^* and essentiall}^ differ from these 



^ Having at first and rather superficially examined the exterior, I first 

 regarded the animal as a Triopa, and called it so [s. part I, p. 138 (73), 

 and the Plates (XIV, XV)]. 



^ See for comparison PI. XIII, fig. 19. 



^ See for comparison PI. XIV, fig. 31, 22. 



* The diagnosis of the Colgce would be : 



Forma corporis fere ut in Triopis. Vaginae rhinophoriales calyciformes 

 obliquse ; rhinophoria retractilia, clavo perfoliato. Tentacula auriformia. 



