566 OLIGOCHAETA 



in FIT. Calciferous glands in XF, XFI, XFII, first pair the smallest, last pair largest. 

 Intestine commences in XIX, liit the typhlosole does not begin lefore XXI ; it attains its 

 full size in XXIII ; from the twenty-eighth segment onwards there are two lateral 

 typhlosolar folds in addition to the median fold. The pharynx is enveloped in a sac 

 v)hich is possibly the first dissepiment ; otherwise that dividing FIl/FIII is the first ; 

 none of the septa are greatly thickened. Mucous gland present. In X, XI, XII are 

 dilated hearts. One pair of sperm-sacs in XI. Spermathecae with a single small 

 diverticulum. Penial setae two to each sac and of a different form j the longer with 

 about eight denticulations on the free extremity ; the shorter is swollen at the extremity 

 and has no denticulations. Hab. — Fenezuela, Mexico (Ude). 



(lo) Benhamia mexicana, Rosa. 

 B. mexicana, RosA, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 394. 

 Definition. Length, 30 mm.; breadth, % mm.; number of segments, I2Q. No pit 



in shin. Clitellum, XIII-XXI, less developed ventrally, but there is no definite median 

 area. Prostomium completely divides buccal segment (?). Setae paired, those of dorsal pair 

 a little further apart tha?i, ventral. Dorsal pores commence III/IF. Gizzards in Fill 

 and IX; calciferous glands in XF, XFI, XFII. Penial setae small, and without 

 ornamentation. Spermathecae with a single small diverticulum. Hab. — Durango, Mexico. 

 If it be really true that the prostomium is continued on to the buccal segment 



by grooves which divide the latter completely, there is no doubt about the very 



marked difference of this from other species. 



(11) Benhamia godeffroyi, Michaelsen. 

 B. Godeffroyi, Michaelsen, JB. Hamb. wiss. Anst. vii, 1890, p. 55. 



Definition. Length, 90 mm.; breadth, a^mm.; number of segments, 174. Anterior part 

 of body apparently pigmented. Clitellum saddle-shaped, {XIII) XIF-XIX. Prostomium 

 prolonged about half way over buccal segment. Setae strictly paired. Spermiducal glands 

 of XFII more developed than those of XIX; penial setae slender, the extremity ornamented 

 ' with numerotis irregular unequally formed notches, which produce a knotty appearance.' 

 Spermathecae without free diverticula, but apparently with rudimentary diverticula attached 

 to the stalk of the pouch. Posterior pair more strongly developed than anterior pair. 

 Eah.—IIayti (?). 

 There is some doubt as to the habitat of this species. According to the labelling 



of the specimens "when received at the Hamburg Museum from the Godeffroy Collection, 



