Pacific coast oligoch^ta. 133 



Typhlosole small. 



Sperm-sacs in xi and xii. 



Sj^ermducts not thickened in the somites near the pores. 



Prostates are larger than in B. nana, but mostly confined to one somite each. 



Spermathecce in vii-viii and viii-ix. The two divisions are of equal size, and 

 globular; small tubercular diverticle pointing forwards. 



Nephridia in three distinct rows on either side of the median line. Nephri- 

 dium n nearest the ventral ganglion consists of two unequal parts, the most ventral 

 of which is the smallest. These two parts together are much larger than either of 

 the other two nephridia. The dorsal nephridia are far apart. 



detailed description. 



Body-wall and sense organs. We find the same zone of sense organs in the 

 body-walls as in B. nana. In B. palmicola this zone is found in all the somites, 

 while in B. nana I found none in somite i. 



The sense-organ zone with pellucid cubic colls is in this species larger than in 

 B. nana, and stands out most prominently on the upper side of the buccal cavity. 



Sejital glands. As has already been stated small septal glands are found in 

 somites ix and x or posterior to the gizzard. These glandular masses are quite small, 

 are situated in the anterior jiart of the somite, close to the intestine, but hardly pro- 

 jecting above the latter. I cannot find that they are in anyway connected with the 

 pharyngeal system of glands. 



Intestine, etc. The portion of the pharynx is not far forward. The region of 

 its epithelial columnar cells is thick and the discharge chambers of the pharyngeal 

 glands are tubular, instead of globular as in B. nana. The pharyngeal glandular 

 mass is less lobed than in B. nana. 



The region between somite i and pharynx is much longer in B. jjalmicola than 

 in nana. The specimen sectioned longitudinally showed the two gizzards as both sit- 

 uated in viii, and there was no septum separating them. If this character is constant 

 is undecided as I did not wish to sacrifice another specimen. The tubular intestine 

 is long and cylindrical and furnished with the regular three pairs of calciferous 

 diverticula in somites xv, xvi, xvii. No lime crystals in the posterior pair. The 

 sacculated intestine commences in xviii or xix. The typhlosole is smaller than in 

 B. nana, but owing to sand I could not definitely ascertain its location. 



Spermathecce. The four spermathecae are of the same form and size. The 

 contraction at the center is deep, dividing the organ in two equal, globular sacs, each 

 sac being confined to one somite; that is, the apical part is situated entirely in the 

 somite posterior to the pore. The basal part carries a short narrow cylindrical and 

 tubular diverticulum pointing forwards. The equality in size and the globular form 

 of the two parts of the spermatheca appears very constant and characteristic of the 

 species. 



Sperm-sacs are sac-like, not racemose. They are found in xi and xii, while 

 in B. nana they are placed in x and xi. 



