NEW SPECIES or PERTCH^TA. 219 



sacs ; and in the absence of a muscular bulb to the duct of the 

 spermiducal gland. 



P. trinitatis, Bedd., has a clitellum like that of P. Floioeri ; 

 but the " loose " character of the spermiducal gland and the 

 shape of the spermatheca, as well as other characters, serve to 

 distinguish the two. 



P. eoa, Eosa, agrees in many points, but the spermiducal 

 gland has a muscular bulb, and is otherwise different; so too is 

 the spermatheca. 



P. Floweri agrees m many points with P. enganensis, but differs 

 in the chseta-formula, character of csecum, spermatheca. 



P. hosschce reminds one of the present worm in its general 

 external characters, but there are three pairs of sperm-sacs ; the 

 spermiducal gland is different, and the spermathecal diverticulum 

 is only half as long as the main sac. 



The other species with four pairs of spermathecae are mostly 

 characterized by more definite peculiar features, serving to maris 

 them off from the present worm. 



PeEICHJETA MADELTNiE, n. Sp. 



This handsome worm was collected by Mr. Everett on Mt. 

 Kina Balu, Borneo, but it does not appear to be identical with 

 any of those described by Beddard*from the same locality. 



The worm (of which I only received a single specimen, which 

 was not fully mature) measures 135 x6 mm,, and consists of 110 

 segments. 



The plan of colouring is similar to that of P. pulcJira^ Mich., 

 P. zebra, Benham, and many other species from this part of the 

 world, in having alternate rings of dark and light colour. In 

 the present instance the darker bands, on removal of the cuticle 

 are rich chocolate-brown ; the light chaetal bands are dead 

 bluish white, without any yellowish tone. 



The dark bauds, widest dorsally, extend right across the 

 ventral surface as narrow streaks of lighter brown. 



At the hinder 18 segments of the worm, as is again very 

 frequently the case, the dark bands are so wide as to meet, 

 sending narrow outgrowths between the individual chetae and 

 almost obliterating the white bands ; on the ventral surface of 

 this region the dark bands are wide, so that the " tail " is darker 

 than the anterior end. The prostomium is margined by white, 

 * Ann. & Mag. Nat. Hist. (6) xvi. 1895, p. 69. 



