192 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE VII. 



Figs. 30-39 represent prostomia of different species of Polynoidae, all mag- 

 nified 19.5 diameters. 



Fig. 30. Polyno'e ( Lepidonotus ) squamata (L) Aud. et M.-Edw. 



Fig. 31. Polyno'e ( Halosydna) brevisetosa (Kinberg). 



Fig. 32. Polyno'e reticulata, sp. nov. 



Fig. 33. Polyno'e gig as, sp. nov. 



Fig. 34. Polyno'e pulchra, sp. nov. With tentacle and antennae. 



Fig. 35. Polyno'e (Halosydna) lordi (Baird). With tentacle and an- 

 tennae. 



Fig. 36. Polyno'e ( Halosydna) fragilis (Baird). Broken base of tentacle 

 in end view. 



F'g- 37- Harmotho'e imbricata ( L. ) Malmgren. The position of the ante- 

 rior pair of eyes, which are invisible from above, is indicated by dotted areas. 



Fig. 38. Harmotho'e hirsuta, sp. nov. 



Fig. ?9. Harmotho'e crassicirrata, sp. nov. 



Fig. 40. Second elytron from right side of Polyno'e brevisetosa, in its nor- 

 mal position. Lightly pigmented; young specimen; X 12.75. 



Fig. 40a. More magnified area of foregoing, showing cells, both pig- 

 mented and unpigmented, and one of the smaller mammilliform tubercles. 

 In glycerine. Viewed as a translucent object by transmitted light; X 300. 



Fig. 41. Second elytron from right side of Polyno'e reticulata. Young 

 specimen; X 17. 



Fig. 41a. More highly magnified area of the same, showing reticulate and 

 pitted upper surface. Most of the epithelial cells pigmented; X 300. 



Fig. 42. Second elytron from left side of Polyno'e gigas., in its normal 

 position. Epithelium of both sides pigmented; pigment of under side 

 duller; X 12.75. 



Fig. 42a. Highly magnified portion of upper surface of elytron of Polyno'e 

 gigas, showing two pigment spots and epithelial cells. A few stomata (?) be- 

 tween the latter; X 300. 



Fig. 43. Second elytron from left side of Polyno'e pulchra. Adult 

 specimen from mantle cavity of Lucapina crenulata; X 12.75. 



Fig. 43a. A few epithelial cells from pigmented, posterior border of the 

 same; X 300. 



Fig. 44. Second elytron of Polyno'e lordi (Baird). A nerve is clearly 

 indicated. Immaculate; X 12.75. 



Fig. 45. Second elytron from right side of Polyno'e fragilis (Baird), in 

 its normal position; nerves from the elytrophore indicated; x 19.5. 



