41 8 FAUNA HAWAII ENSIS 



and Molokai. I have seen in the second collection forwarded to me additional speci- 

 mens from Mauna Loa. I can thus improve somewhat upon my original description of 

 this species. It is a smallish slender worm measuring up to loo mm. in length with a 

 diameter of about 3 mm. The number of segments is curiously constant in the indivi- 

 duals which I selected for counting. In two the number was 105, in a third 104. The 

 lengths of these specimens varied somewhat — from 82 through 98 to 100 mm. It is 

 interesting to note the constancy of the number of segments. The differences in length 

 are of course not sufficient to be of importance and are to be accounted for by the 

 different degrees of contraction of the individuals. 



The dorsal pores commence between segments 11, 12, and are visible upon the 

 clitellum. 



The setae of a given series of segments number as follows : i. 21 ; 5. 33 ; 12. 52 ; 

 16. 53. The setae of the first two segments are small ; those of the ne.xt four are 

 stronger, after which segments they again diminish in size. 



The clitellum is sharply marked off from the segments adjacent to it and both 

 commences and ends with its own proper segments. I could not discover any setae 

 upon it. 



Neither could I find anywhere upon the body of the worms genital papillae. The 

 male pores are upon the usual segment ; they are slightly expanded transversely and 

 have therefore an eye-like outline. They are fairly conspicuous ; in one case the end 

 of the spermiducal gland duct was protruded for a little way. The two pores are 

 separated by 18 setae. 



There are three fairly stout intersegmental septa in front of the gizzard which are 

 bound to each other by numerous muscular threads in the usual way ; after the gizzard 

 come two strong septa to the anterior of which the gizzard itself is bound at its posterior 

 end by at least five muscular straps. In a specimen from Lanai septum 8/9 was 

 present but thin. 



The gizzard has the usual position that it has in this genus. The intestinal caeca 

 are present, but are small and simple ; they occupy not more than two segments. 



The last of the "hearts" is in segment 13. 



The two pairs of sperm sacs are in segments 11, 12 ; the sperm reservoirs as also 

 usual in segments 10, 11 ; of the latter the anterior pair are sometimes larger than the 

 posterior 



The spermiducal glands are much incised and occupy not more than three 

 segments. Their muscular duct is longish and curved and is unprovided with a 

 terminal copulatory dilatation. As to the form of the spermiducal glands it is often 

 possible to use their characteristics as apparently valid specific distinctions. But it is 

 necessary to be accurate in their delineation and cautious as to laying too much stress 

 upon certain features in distinguishing species, as is shown by the present species. In 

 most of those which I examined the gland had a somewhat ear-like form, the lower 



