208 



Memoirs of the Indian Museum. 



[Vol.. I, 



Fig. 21. 



Octochcetus 



maindroni , 



f. typica. 



Penial setae like that of var. chaperi (see fig. 31), very tender, about 1*2 mm. 

 long and 10 /^ thick, somewhat bent only at the distal end. Distal 

 end somewhat flattened, but not broadened, with two rather sharp 

 side-edges, ending in a simple tip. Below the flattened portion the 

 seta is ornamented with very irregular, partly oblique, transverse rows 

 of large, rather slender teeth. 



Spermathecse (fig. 29) : Main pouch with an elongated sack- 

 shaped ampulla and a thinner, short duct. Into the distal end of 

 this duct opens a broad and very short diverticulum which nearly 

 encircles the duct. The diverticulum contains a number (about 7 ?) 

 of small seminal chambers, which externally are separated by very 

 slight to somewhat deep furrows or incisions. As the distal end of 

 the duct gets narrower in the region of the diverticulum, the latter 

 hardly projects above the general surface of the duct. The diverticu- 

 lum of the anterior spermathecse seems to be even more inconspicuous 

 than that of the posterior pair. Perhaps these spermathecse are not 

 yet quite mature. It is possible that at a more advanced stage they 

 may resemble more those of var. chaperi. 



I could not detect copulatory setse in the vicinity of the spermathecse, but I dare 

 not say that there are none. 



Hab.— South India, Gingi in South Arcot ; M. MAINDRON leg. (Mus. 

 Paris). 



VAR. CHAPERI, MICHI.SN. 



(Plate xiv, figs. 30, 31.) 



0. m., eh., MICHAElySEN, in Mt. Mus. Hamburg, xxiv, p. 169. 



A single unfortunately very badly-preserved specimen of an Octochcetus species I 

 regard as a variety of 0. maindroni. 



External Characters. — Dimensions : Length 50 mm., thickness 2^ — 3 mm., 

 number of segments ca. 130. 



Clitellum ring-shaped, occupying segments 13 — 17 (=5). 



Female pores at the anterior part of the 14th segment, somewhat closer 

 together than the lines of setse a. 



Copulatory organs : A large unpaired, median ventral, transversely oval papilla 

 on the i8th segment between the seminal furrows, a still broader unpaired, median ven- 

 tral cushion on the 13th segment. The latter laterally transgresses the lines of setse b. 



Spermathecse: Main pouch with elongated sack-shaped ampulla which opens 

 through a short narrow duct not sharply set off from the ampulla. Into the duct 

 opens a single large, nearly semi-globular, very short and narrow stalked diverticulum 

 nearly as thick as the ampulla. The diverticulum contains a great number of seminal 

 chambers which project a little above the surface, making the latter appear mam- 

 millated. 



Hab. — South India, Weyra Karur in the Madras Presidency; CHAPKR 

 leg., 1883. 



