1901.] OP THE GENUS BENHAMIA. 215 



numerous fine spiuelets 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 sjpermatliecce, again, are very like those of the last species. 

 The specimen being, however, in 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 Avhich 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 difl:erences which the 

 seven species show from each othei", since their distinctness will 

 be generally allowed. The points used serve to discriminate 

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



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



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

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



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



convex outwards. Papillse more numerous. Penial 

 setse with fine spinelets arranged in transverse 

 rings and covered by a cap-like structure. 



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



outwards. Calciferous glands in xv.-xvii. No 

 papillae. Sexual setse on vii. and viii. Duct of 

 spermatheca long. 



(4) Benhamia stamjJ'Jlii. A larger worm, 330 mm. by diameter of 



10 mm. No papillae, 



(5) Benhamia schlegeli. Larger worm, 350-750 mm. ; diameter 



15 mm. No papillso, Calciferous glands in xv.- 

 xvii. Last heai'ts in xiii. Penial setae "like an 

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



(6) Benhamia liberiensis. Larger worm, 350 mm., diameter 10 mm. 



Papillae diiferent in arrangement. Calciferous 

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



(7) Benhamia budgetti. Of similar size, but genital papillae different. 



Penial setae with few spinelets distally. 



The characters of these seven species may be compared with 

 those of the two new species Benhamia gambiana and Benhamia 

 michaelseni. 



