EISEN 



the same size about one and a half to two and a half times as wide 

 as the diameter of the ventral nerve cord. They are wing-like and do 

 not bend over the ganglion but stand out laterally. In the anterior 

 somites from XI to II, cross-sections show that the large dark stain- 

 ing cells, which form an integral part of the ganglion, and which do 

 not project outside of the ganglionic lining, send down ducts through 

 the body-wall and through the epidermis in exactly the same manner as 

 do the ventral glands posterior to the clitellum. The only difference 

 seems to be that the anterior cells in question are smaller and fewer in 

 number and confined to a much smaller space. Posterior to the cli- 

 tellum the area perforated by the ducts is equal to about one-half the 

 length of the somite, while in the anterior somites the area is perhaps 



only one-fifth of the 



length of the somite. 

 There is probably no 

 great functional differ- 

 ence between the two 

 sets of cells. 



Lumbricillus annu- 

 latus from Orca. 

 The specimens from 

 Orca differ in a few 

 slight particulars from 

 those from Metlakatla. 



FIG. 52. Lumbricillus annnlatus. 



The spermathecae are slightly longer and without any trace of an inner 

 chamber for the reception of the spermatozoa. The color is pure 

 milky white. The prostomium is more rugose and somewhat more 

 pointed than in the specimens from Metlakatla. In other respects 

 the specimens from the two localities resemble each other. 



The size and shape of the glands lining the duct of the spermathecae 

 vary almost indefinitely. In some specimens the agglomerations are 

 small and far from each other, in other specimens they are large and 

 crowd one another. 



LUMBRICILLUS RITTERI sp. nov. 



pi. xui, figs. 5-9; text-figs. 53 and 54. 



Definition. Length 25 mm. or less, width 2.5 mm. or less. 

 Somites about 60. Prostomium rounded and short. Somite II 

 narrow. Setae typical : ventral, 9, 8, 9, 9, 8, 8, 8, 8, 7, 7, o (XII) , 

 5> 5 5> 5> 5> 7> 5 5 etc - > other specimen : ventral, 5, 5, 5, 5, 6, 6, 6, 5, 

 6, 7, o (XII), 5, 5, 5, 4, 4, 5, 5, 6, 5, etc. ; lateral, 5, 5, 5, 5, 6, 6, 6, 



