ACANTHODRILUS SCHLEGELII. 105 



as the glands described by Beddard in Pleurochaeta ') 

 and Typhaeus "). 



Segmental organs have not been observed , as is the case 

 in the species described by Perrier ; Ray Lankester however 

 has represented them in a diagrammatic section of A. kergue- 

 lenensis , without mentioning them in his paper with a single 

 word. In my specimen I found only in the 16th, 17th and 

 19th segment on the middle of each ring a transverse series of 

 slender glandular tubes ; highly magnified these tubes pre- 

 sent a strong resemblance with true segmental organs , 

 being likewise composed of several morphologically different 

 parts. 



Hab. Liberia. 



2. Acanthodrilus Bilttikoferii, nov. spec. 



The other specimen differs from the foregoing in so 

 many characters, that I must consider it as belonging to 

 another species. 



It measures 320 m.m. in length. There is a distinct cli- 

 tellum, extendig from the 13th to the 19th segment. 

 These segments are glandular , thickened , except on the 

 ventral side of the 17th, 18th and 19th ring, over an 

 oblong area , divided by a groove in two portions. The 

 setae are arranged in four double series; in the anterior 

 portion of the body the pairs of bristles are placed rather 

 closely near each other , but in the posterior portion they 

 are separated by about the double distance , the lateral 

 pairs being so placed not on the ventral but on the late- 

 ral side of the body. It the 1 7th and 19th segments the 

 medial pair of bristles is modified in penial setae; conse- 

 quently in our species the penial setae are situated within 

 the clitellum , whereas in A. obtusus and A. ungulatus they 

 are placed behind , and therefore Acanthodrilus is regarded 

 by Perrier as one of the Postclitelline Lumbricoids. In 



1) Transact. Royal Society of Edinburgh. Vol. XXX, 1883, p. 481. 



2) Annals and Magazine of Nat. History. Oct. 1883, p. 219. 



Notes froin tlie Leyden Miuseum, Vol. VI. 



