176 



albidus Henle), and Fridericia (agilis Smith, tcncra and firuia Smith 

 and Welch, agricola Moore, and sinia, oconccnsis, and doiiglascnsis 

 n. spp.). 



For convenience these genera will be considered separately, and in 

 the order named. 



Hcnlca urhancnsis and H. moderata have penial bulbs of the liim- 

 bricillid type as defined by Eisen (see p. 174), and exhibit no peculiar- 

 ity of structure calling for alteration in his conclusions. 



Eisen makes the following statement ('05, p. 90) concerning the 

 character of the penial bulb in Marionina: "Penial bulb without in- 

 terior muscular strands There are two sets of glandular cells 



opening in the bulb. One set opens into the lower part of the sperm- 

 duct, while the other opens onto the base around the pore." Accord- 

 ing to his investigations, both M. alaskcc and M. americana conform 

 to this description. 



Studies on M. forbcscr have shown that while the bulb is like 

 Eisen's lumbricillid type in being a single compact structure invested 

 in a musculature wdiich does not penetrate into the interior, it does 

 not have two distinct sets of cells as required by his description of the 

 genus. Instead, the cells are all of one kind and all apparently open 

 on to the surface of the bulb. None could be found which emptied 

 into the sperm duct. Michaelsen ('05b, pi. I) figures the penial bulb 

 of 71/. falclandica, and although it can not be determined whether any 

 of the cells open into the sperm duct, all of the cells in the bulb appear 

 to be of the same kind. The bulb is, however, of the compact lumbri- 

 cillid type. 



Benham ('05, p. 294, pi. XIV, fig. 9) describes and figures the 

 penial bulb of M. antipoduiu, which is a very small organ composed 

 of similar cells through which the sperm duct penetrates. Opening 

 into the dorsal surface is a conspicuous accessory gland which lies 

 entirely outside the bulb and is much larger than the latter. Michael- 

 sen ('05a) described the penial bulb in M. zverthi as a small organ en- 

 tirely concealed in the body wall and possessing an accessory (pros- 

 tate) gland which extends into the body cavity. 



Since, then, in both M. antipodinn and M. wcrthi the penial bulb 

 has an accessory gland, it becomes necessary to modify the definition 

 of the subfamily Liinihricillincc to include this character. Further- 

 more, it can no longer be said that the bulb in Marionina has uni- 

 formly two sets of cells within it. 



Studies on Limibricillus rntilus and L. insidaris show that in both 

 species the structure of the penial bulb conforms to the general lum- 

 bricillid type as defined by Eisen and calls for no special comment in 



