222 Mn. F. E. BEDDAKD OX KEW EATlTHWOHirS. [MuP. 19, 



(11) Acanthodrilus corralensis, n. sp. 



Of this species there was ouly a single individual. 



It is tolerably' large, measuring 103 mm. in length by 5 mm. iu 

 diameter ; number of segments 145. 



The colour is very much that of Acanthodrilus picbis ; and it 

 also resembles that species in the fact that the prostomiuni only 

 extends over about one halt of the buccal segment. 



On the other hand, Acanthodrilus corralensis differs from 

 A. pictv.s in that the sette are strictly paired from end to end of 

 the body, being only to a very slight extent separated at the 

 posterior end of the body. In this region the body has a roughly 

 quadrangular section, the setfe being implanted at the angles. The 

 symmetry of the iigure, however, is broken, ouing to the two 

 ventral pairs being closer together than the two dorsal. 



The clitellum occupies segments xiJi.-xvii. and is complete. 



The dorsal pores commence at any rate in the clitellar region. 



Xone of the intersegmental septa are especially thick. Those 

 separating segments x./xiii. are rather stouter than the others. 



The gizzard lies anteriorly to the first pair of spermathecje, but 

 I am not able to fix its segment with precision. In the xivth and 

 xvth segQients, parricularly in the latter, the oesophagus is enlarged 

 and highly vascular, its lining membrane being folded. 



The last pair of hearts are in segment xii. 



The testes and sperm-duct funnels are one pair only in seg- 

 ment X. The racemose sperm-sacs are in ix. and xi. 



The spermiducal glands are like those of a few other species 

 of the genus in that the anterior pair are distinctly larger than the 

 posterior. 



The penial setse, of which there were two in the bundle that I 

 examined (the posterior on the left side), are crooked at the end 

 like a crosier. The ends of the set* have numerous denticulate 

 ridges. The setae resemble, in fact, very closely the penial setse 

 of A. pictvs. 



The spermatheciP are not very large ; each is an oval sac, to the 

 duct of which is fixed the very slender duct of the appendix, 

 widening out above into an oval sac. The diverticuluru of the 

 Spermatheca is about half the size of the pouch. 



Hah. St. •17, Corral, " "Wald, unter Steinen."' 



(12) Acanthodrilus simulans, n. sp. 



This species was found in a large gathering of worms from 

 Corral in company with the last species and with a considerable 

 number of examples of Microscolex spatidifer. The external 

 characters of A. simulans are so like those of the last-named 

 species that they were at first passed over accidentally. It is the 

 colour which is so strilcingly like. In the specimens of M. sj^atu- 

 lifer from this locality the colour of the dorsal surface -was a 

 reddish brown instead of the more usual violet. Precisely the same 

 colour was found in the Acanthodrilus. As this species is also 



