ZOOL.— Vol. II.] EISEN—OLIGOCH/ETA. 20I 



The spermathecal pores are found on the anterior face of 

 the somite, about half-way between the setae and the bottom 

 of the intersegmental grooves. The glandular prostate 

 contains two layers of cells. 



Septa. — The septa do not strictly correspond to the inter- 

 segmental grooves, but start out almost from the centre of 

 the somites. 



The septal glands are very diminutive in somites IV to 

 VII and in X, They are attached to the blood vessels. 

 The suprapharyngeal glands are of medium size. 



The brain is situated in somite II. 



The tubular intestine and the anterior segments of the 

 sacculated intestine are furnished with chloragogen cells. 

 Similar cells also surround the dorsal vessel. Sections 

 show that the most anterior dorsal pore is between somites 

 VII and VIII. 



The nephridia commence in somite IV. Their structure 

 has not been studied, but it appears to be similar to that of 

 the nephridia of the other species, that is meganephridia, 

 resembling those of Diplocardia Keyesi. 



The dorsal vessel is double. In XI and XII it is narrow 

 and tubular; in XIII to XVI it is much wider. 



Color. — As far as could be judged from specimens pre- 

 served in formalin, the color is pale flesh without any trace 

 of pigment. 



The species is named for Mr. Albert Koebele, Horticul- 

 tural Entomologist of the Hawaiian Government, to whom 

 I am greatly indebted for a number of most interesting spe- 

 cies which he collected in Mexico. 



Trigaster Benham. 



Definition. — Setae paired, eight in each somite. Clitellum long or short. 

 Gizzards two or three. Nephridia plectonephric. Spermathecse two pairs, 

 in VIII and IX, with or without diverticle. No diverticles of the intestine. 

 Prostates two pairs, open in the somites anterior and posterior to the male 

 pores, which are in XVIII. Penial setse present or absent. Sperm-ducts 

 are completely hidden in the muscular layer of the body-wall. 



