234 DESCRIPTrONS OF EARTHWORMS. 



extending over nearly six segments. In segment 17, 18 

 and ] 9 on each side of the ventral nerve-cord a longitu- 

 dinal glandular thickening is visible , corresponding with 

 the external papillae. 



Though we know several PgnV/iaeto-species , which pos- 

 sess four pairs of spermathecae , our specimens could not 

 be identified with one of them ; therefore this new species 

 may be called after Mr. Vorderman, who collected them. 

 P. vordermanni is without doubt closely allied to P. feae 

 Rosa ^), — modiglianii Rosa ^), — vaillanti Beddard ^), — 

 indica Horst *) , and — posthuma Vaill. ( — a (finis Perrier) , 

 especially to the two last named species. However in P. 

 posthuma , according to the description and figures of Vail- 

 lant ^), Perrier ^) and Beddard '), the spermatheca is a pear- 

 shaped pouch with a small , short diverticulum and there 

 is only a pair of papillae upon segment 17 and 19. P. 

 indica has a much smaller number of setae in a row (42 

 to 48) , and possesses no papillae at all , as likely is the 

 case in P. vaillanti and P. feae. P. modiglianii from 

 Nias differs , according to Rosa's description , by having 

 only two small papillae on the internal side of each papilla 

 bearing the male pore. 



Perichaeta sluiteri, n. sp. 



We possess four specimens of this Perichaeta ; the hn^ih. 

 of the largest of them is 190 mm., the number of its 

 segments amounting to 135. The colour is yellowish brown , 



1) Perichetidi di Birmania; Ann. del Museo Civ. di St. Nat. di Genova, Ser. 

 2, Vol. VI (1888), p. 161. 



2) Lombrichi raccolti nell' isola Nias; the same Journal Ser. 2, Vol. VI [ 

 (1889), p. 1. 



3) Worms of the genus Perichaeta; Proceed. Zool. Soc. London, 1890, p. 52. 



4) Midden-Sumatra, DI. IV, Natuurl. Historie, 12e Afd. Vermes, p. 3. — 

 Notes from the Leyden Museum, Vol. V (1883), p. 182. 



5) Ann. Sc. Nat. Zoölogie, 5e Ser. Ï. 10 (1868), p. 228. 



6) Nouv. Arch, du Muséum, T. VII, p. 106. 



7) Ann. and Mag. Nat.-Hist. 1886, p. 93. 



^otes from the Leyden Museum, Vo!. >Lil. 



