NEW SPECIES OP PEEICH^TA. 



211 



glands at the side of the " spermiducal gland," but these are 

 isolated and open by several independent pores around the male 



ram of a lougitudinal section of the glandulo-miiscular sac of P. Arturi. 



a, a'. The anterior and posterior glands, lined by glandular epithelium. 



b. Duct of gland leading to the "atrium " (e). d. The end of the protruded 

 penis, cut longitudinally to show tbe two ducts. /. The duct of the 

 spermiducal gland, ff. The sperm-duct. c. External pore, common to 

 / and ff. 



pore. In several other species, e. g. P. aspergillu7n and P. her- 

 mudensis, glands of smaller size similarly open by small isolated 

 pores in this region ; but I do not recall any other species of 

 the genus with a " glandulo-muscular " apparatus like that of 

 P. Arturi. 



The copulatory apparatus amongst Earthworms is very varied, 

 and among those organs which serve as a " penis," that of 

 Eudrilus appears to bear most resemblance to that of the present 

 worm ; in it a small tongue-shaped papilla, traversed by the 

 sperm-duct, lies, when at rest, in a subspherical muscular sac, 

 as described and figured by Perrier and Beddard and Horst. 

 Beddard has suggested that this papilla or " penis " is capable 

 of protrusion when the muscular sac is everted. Perrier* has 

 figured it protruded, and it is so in a specimen in my possession. 

 It is not only very much smaller than the penis in P. Arturi, 

 but its mode of protrusion is evidently quite different, being 

 due to the contraction of the wall of the atrium, and not to the 

 unfolding or straightening of a part of itself. And in other 



* Nouv. Arch. Mus. Paris, 1872, pi. 2. fig. 28. 

 LINN. JOUEN. — ZOOLOGY, VOL. SXVI. 15 



