1895.] MB. r. B. BBDDABD ON KTEW EAETHWORMS. 235 



sac of penial setae. At the external orifice it widens out into a sac 

 o£ which the epithelium is more glandular on the ventral surface, 

 being here composed of tall non-staining cells ; from this sac a 

 tube lined with a precisely similar epithelium leads to the exterior. 



Hah. St. 140, Uschuia, forest. 



The most singular feature in the internal organization of this 

 worm is the ovaries : these are positively of enormous size. They 

 are quite as large as the sperm-sacs of the same worm, and occupy 

 a considerable amount of the ccelomic cavity of their segment (the 

 xiiith). Not only are the ovaries themselves thus unusually large — 

 the ova share in the increased size, but although they ai-e very 

 much larger than the ova of the common Earthworms of this 

 country, they do not approach in any way the ova of the aquatic 

 Oligochaeta : that is to say, they have not got a great amount of 

 yolk deposited within them — no more, in fact, is present than in 

 other Earthworms. So large are the ova that they are not merely 

 visible to the unarmed eye — this is possible even in the common 

 Allohhophora — but they suggest parasitic Gregarines, with which I 

 was disposed to identify the ova until they were submitted to 

 microscopic examination. 



The spermathecse are in the ixth segment, as is almost invariably 

 the case with this genus. A stalked diverticulum opens in common 

 with an oval pouch ; the diverticulum has a mulberry-shaped 

 outline, and appears, as in other worms, to be the only receptacle of 

 the sperm. 



The minute structure of this diverticulum is also different from 

 that of the pouch : when sections are taken through the periphery 

 it presents the appearance of a compound tubular gland, the tubes 

 being separated from each other by interstitial tissue. The whole 

 diverticulum in fact consists of a much-folded epithelium. 



(6) Microscolex corralensis, n. sp. 



Of this apparently new form I only found a single species in a 

 copious gathering from Corral, Valdivia. 



Its length is 40 mm., the diameter 4 mm. ; the number of 

 segments a little over 70. In the preserved state this worm is a 

 pale greyish brown, the clitelUim being pinky brown. 



The prostomium is continued by furrows over the entire buccal 

 segment : these furrows converge posteriorly but do not meet. 



The clitellum occupies segments xiii.-xvii., the posterior part of 

 xiii. and the anterior part of xvii. not being invaded by glandular 

 substance. On xii. and xiv. alone the clitellum is complete ; on 

 the remaining segments it only reaches the ventral pair of setae. 



The setae are strictly paired from end to end of the body. On 

 the segments immediately in front of and behind the xviith (which 

 bears the male pores) the ventral pairs diverge from each owing to 

 the tension caused by the rather lateral position of the male pores. 



There are dorsal pores, but I am unable to fix the exact segment 

 in which they commence. 



Sopie of the segments in the neighbourhood of the spermathecee. 



