108 PROCEEDINGS OF THE ACADEMY OF [1880. 



3. P. plebeia, Loven. Index Moll., 1846, p. 6.^ M. Atlanticum. 



4. P. doriformis (Quatref.). Phanerobrancbe doriforme. Moquin-Tandon 



(pseud. A. Fredol) Le monde de la mer., 1864, PI. XII, fig. 1. M. 

 Mediterraneum. 



5. P. eanteriata (Quatref.) Phanerobrancbe a chevrons. Moquin-Tandon 



(do) 1. c, pi. XII, f. 2. M. Mediterraneum. 



II. PALIO, Gray. 



Marge limbi frontalis tuberculatus. Folia branchialia bi- vel tri- 

 pinnata ; appendices dorsales (branchiales) niinores, complures. 

 Lamellae mandibulares simplices (sine processu superiori). 



6. P. Lessonii (d'Orb.). Pol. ocellata, A. et H. M. Atlanticum. 



7. P. pudica, Loven. Ind. Moll., 1846, p. 6. M. Atlanticum. 



8. P. pallida. Bgh.. n. sp. M. Pacificum. 



9. P. diibia, Sars. Bidr, til Soedyrenes. Naturh., 1829, p. 13. Tab. 3, 



fig. 5, 6. Loven, Ind. Moll., 1846, p. 6. M. Atlanticum sept. 



10. P. ? Cookii, Angas. Journ. de Conchyl., 3 S., IV, 1, 1864, p. 58 ; PI. V, 



f . 6. M. Pacificum. 



11. P. ? Capensis, Quoy et Gaim. Voy. de I'Uranie. Zool., 1824, p. 417 ; 



PI. 66, f. 4. M. Capense.2 



P. pallida, Bgh., n. sp. Plate XV, fig. 14 ; Plate XVI, fig. 1-9. 



Color flavescens. Branchia sexfoliata. 



Lamellie mandibulares fere ut in FoL Lessonii, sed magis elongatae. 

 Armatura lingualis fere ut in Pol. Lessonii; denies externi 5. 

 JIab. Oc. Pacificum septentr. 



Of this form Dall dredged a single individual in June, 18t3, at 

 Kyska Harbor (Aleutians), at the depth of ten fathoms on rocky 

 bottom. According to Dall, the color of the living animal was " yel- 

 lowish-white." 



The length of the animal preserved in spirits was 7.0 mm., with a 

 height of 4.0 and a breadth of 3.0 mm. ; the height of the branchial 

 leaves about 1.0 mm., also that of the rhinophoria ; the breadth of the 



1 "Viridifusca, sulpliureo maculata, papillis frontis 10, brancliiali 

 utrinque una postica majore ; 11 mm. Bohus," Loven. 



This, as well as the other new Polycera of Loven, has not since been 

 seen (Cf. G. O. Sars, Moll. reg. arct. Norv., 1878, p. 313). 



2 Of the three (not too naturally represented) "Polycerse " of A. Fredol 

 (Moquin-Tandon), the one (1. c. PI. XII, fig. 6) seems to be the Pel. 

 Lessonii, the other two (fig. 3, 4) belong undoubtedly to the genus 

 Thecacera. 



