1892.] SPECIES OF EARTHWORMS. 67^ 



The dorsal pores commeuce between xi./xii. 



The gizzard measures 8 mm. in length, and appears at first sight 

 to occupy about four or five segments ; it really corresponds^ to 

 segment v., which is increased in size at the expense of neighbouring 

 segments for its reception. The calciferous glands are in xv. and 

 xvi. ; they have the appearance of being merely dilatations upon 

 the course of the oesophagus, which is the case with the other 

 species of this genus. 



The intestine begins in xviii., but the typhlosole (which is very 

 prominent) does not begin before segment xx. ; it ends at about 60 

 segments before the end of the body. 



The first septum is in front of the gizzard. After the gizzard are 

 six stout septa, and, following these, are two which are rather more 

 developed than the rest, but not as strong as those which precede 

 them. The nephridia are diffuse, and there is a particularly dense 

 mass of tubes in the anterior segments, which seem to represent the 

 mucous gland of Octochcs/us multiporus^. 



The dorsal vessel is double, and there are three pairs of hearts 

 in x.-xii. 



All the gonads are attached to the front wall of their segments. 



The spermatothecae (in viii., ix.) have a minute clump of diver- 

 ticula, presenting the appearance of a solid body, about the size of a 

 pin's head. 



There are no penial setse. 



Hab. New Zealand. 



This species is evidently perfectly distinct from the last ; it is, 

 however, clearly referable to the same genus, if this genus be 

 admitted. The diffuse nephridia, double dorsal vessel, separate 

 setse, absence of penial setse, and anterior position of gizzard cause 

 it to resemble the three other species which I refer to the genus 

 OctochcBtus. It differs from O. multiporus and from O. tliomasi in 

 the following points : — 



(1) The prominence of the atrial pores as seen from the outside. 



(2) The position of the gizzard in segment v., and its limitation 

 to this segment. 



(3) The presence of two pairs of calciferous glands in xv., xvi. ; 

 in this the present species resembles 0. antarcticus. 



(4) The existence of only three pairs of hearts instead of four. 



(5) Six thickened septa instead of seven. 



(6) The attachment of the gonads to the front wall of their 

 segments ; in this character 0. huttoni resembles 0. antarcticus. 



The next species which I describe is referable to the genus 

 Acanthodrilus (s. s.). 



3. Acanthodrilus smithi, n. sp. 



I have been able to examine, though the kindness of Mr. W. W. 

 Smith, some seven examples of this new species of ^canMocZnYws; 

 the general appearance of the worm is very different from that of 



' I did not ascertain whether these opened into the buccal cavity as in 

 0. multiporus. 



