1901.] OF THE GENUS BE>"HAMIA. 215 



numerous fine spinelets which are four or five rows in the optical 

 diameter of the seta. The arrangement, however, is not a regular 

 one. These spinelets are precisely those of B. gambiana, but a 

 much larger part of the seta is beset with them. 



The gpermathecat, again, are very like those of the last species. 

 The specimen being, however, iu a rather better state of pre- 

 servation as regards these organs, their form could be more 

 accurately ascertained. Each pouch is roughly globular and is 

 nearly sessile upon the body-wall, a short and thick duct putting 

 it into communication with the exterior. There were no visible 

 diverticula. 



It will be, I trust, obvious from the foregoing descriptions that 

 the two species with which I am concerned in the present com- 

 munication are distinct from any of those which have been 

 previously described by myself or others. As, however, the seven 

 West-African species to which I have referred on p. 210 are so 

 extremely like each other and like B. gambiana and B. michaelseni, 

 I append a brief series of statements of the chief characters in 

 which they diverge from those treated of in the present paper. 

 I have not been anxious to emphasize the differences which the 

 seven species show from each other, since their distinctness will 

 be generally allowed. The points used serve to discriminate 

 B. budgetti, B. gambiana, and B. miehadseni from any of those. 



(1) Benhamia buttikoferi. A larger and thicker worm. 230- 



320 mm. by 10 mm. Clitellum xiii.-xix. Last 

 hearts in xiii. Sperm-sacs in xii. only. 



(2) Benhamia horsti. Of similar size, but seminal gutter strongly 



convex outwards. Papilla} more numerous. Penial 

 setae with fine spinelets arranged in transverse 

 rings and covered by a cap-like structure. 



(3) BenJiamia beddardi. Of similar size, but seminal gutter convex 



outwards. Calciferous glands in xv.-xvii. No 

 papilla?. Sexual setae on vii. and viii. Duct of 

 spermatheca long. 



(4) Benhamia stampflii. A larger worm, 330 mm. by diameter of 



10 mm. No papilla?. 



(5) Benhamia schlegeU. Larger worm, 350-750 mm. : diameter 



15 mm. No papilla?, Calciferous glands in xv.- 

 xvii. Last hearts in xiii. Penial seta' "like an 

 elephant's tusk " in form, 4 mm. long. 



(iii J'„ nhamia libt ri nsis. Larger worm, 350 mm., diameter 10 mm. 

 Papilla different in arrangement. Calciferous 

 glands in xv.-xvii. Penial Beta dilated at end. 



(7i Benhamia budgetti. Of similar size, but genital papilla.- different* 

 Penial seta? with few spinelets distally. 



The characters of these seven species may be compared with 

 those of tin* two new species Benhamia gambiana and Benhamia 

 michoi Iseni. 



