1895.] ME. F. E. BEDDABD ON XEW EAETHWOEMS. 233 



with the genus, in the xiith segment. The testes iare large 

 and bushy ; there are only a single pair of them lying in segment x. 

 Opposite the testes are the conspicuous funnels of the sperm-ducts. 

 I could find neither testes nor funnels in segment xi., -where, 

 however, are a pair of large and racemose sperm-sacs. 



The spermiducal glands are plainly separable into a glan- 

 dular and a non-glandular portion. The latter is rather less 

 than one-half of the length of the former and very much more 

 slender. The entire gland is straight and occupies about four 

 segments. It opens in common with an opaque thick-walled sac 

 containing penial setae. This sac is not so long as, but much 

 stouter than, the muscular end of the spermiducal gland. The sac 

 coritained, in a specimen dissected by me, 8 penial setae on one side 

 of the body. Only two of these, however, appeared to be fully 

 mature. These were to be distinguished from the rest by the fact 

 that the implanted end was curved. In the others this end was 

 broadened out. In the former setae the free end of the seta 

 tapering gradually to the end was unornamented ; in another 

 specimen, however, these setae were faintly ornamented. I am 

 therefore disposed to think that the ornamentation upon the 

 immature setae is a mark of their immaturity, the spines being as 

 a rule worn off in the setae which happen to be in use. A curious 

 difference in the constitution of the two kinds of setaj was shown 

 by treating them with a strong solution of potash : when this 

 reagent was applied, the presumably immature setas became almost 

 invisible, while the others did not exhibit any changes. 



There is nothing worthy of comment concerning the ovaries 

 and their ducts. The spermathecae are a single pair lym<y in 

 segment viii. They are oval pouches, each with two symmetrically 

 arranged diverticula, in which alone there appeared to be sperm. 

 The spermathecae are precisely like those of Amnihodrilus hovei. 



In the gatherings from Punta Arenas and Uschuia, I found 

 specimens coexisting with the normal form which were shorter 

 (50 mm., 95 segments), and had a single median papilla upon 

 segment xvii. instead of a pair. One specimen, however, had the 

 two pairs of papillae characteristic of the typical variety ; hence I 

 do not separate them as species. 



Hah. St. 75, Magellan Straits, Punta Arenas. St. 140, 

 Uschuia, forest. St. 65, Magellan Straits, fresh water. St. 179,' 

 Navarin IsL, Porto Toro. St. 165, Puerto bridges. 



The resemblance between this species and Acanthodrihis bovei, 

 coupled with their occurrence in the same locality, is interesting. 

 This resemblance extends to internal characters. The spermathec^ 

 are similar in both, and in both the intestine begins unusually early, 

 the xviith being the more usual segment. I call attention in the 

 course of this paper to the likeness, more or less pronounced, 

 between other species of Mkroscolex and other species of Acmitho- 

 clrilus. 



Apart from these particidar likenesses, it is a curious and not 

 wholly intelligible fact that the bulk of the South-American 



