226 WILLIAM BLAXLAND BENHAM. 
I. Perichetz without papille. 
a. With one pair of spermathece. 
P. quadragenaria, from the East Indies.—Length 210 
mm., breadth 4 mm. The sete are about 40 to each so- 
mite. The spermathece are only two in number, in the 
somite vir; their aperture is in the anterior part of this 
somite, and each consists of a globular sac in somite vir, and 
narrow coiled appendage with enlarged extremity in the so- 
mite VII. 
P. elongata, from Peru.—Length 355 mm., breadth 4 mm. 
The number of sete is not mentioned. The spermathece 
are only two in number; their pores are between somites Iv 
and v, but whether they lie in the somite iv or in Vv is not 
stated. They consist each of a single sac, and have no acces- 
sory parts. 
6. With more than two pairs of spermathece. 
P. Houlleti, from Calcutta and Cochin China, is very fully 
described. Length 1 dem. 
There are forty-five to fifty sete round each somite. 
There are three pairs of spermathece, lying in somites vir, 
vill, and 1x, and opening on the anterior edges of these 
somites. Each consists of three parts; a large ovoid sac, with 
a coiled tube opening into its duct, lying in the somites 
named; whilst a very much smaller sac, also opening at the 
same point, lies in the preceding somite in each case. 
[P. cingulata, Sch. will come in here.] 
II. Perichetz with papille. 
a. With two pairs of spermathece. 
P. aspergillum (habitat unknown).—Length 370 mm., 
breadth 10 mm. There are about eighty sete round each so- 
mite. The spermathece are in two pairs, in somites vIII 
and 1x, with their pores in the anterior region. Lach is a 
simple, large, and somewhat globular sac; but there are nu- 
merous smaller sacs round it, each having a separate pore; 
some lying in the same somite as the spermathece, others in 
the somite in front. So that, both in front and behind each 
