EVERTEBRATA 481 



two other species of bee (B. muscorum and B. sylvarum), but it 

 remained for Sir John Lubbock to demonstrate that this 

 parasite not only infests these insects, but also Bombus lucorum, 

 B. lapidarius, B. pratorum, B. subterraneus, and Apathus 

 vestalis. I possess specimens from Vespa vulgaris and F. rufa. 

 Sir J. Lubbock and Mr. Cole have separately given full 

 anatomical descriptions of the worm. According to Lubbock 

 the so-called female is about an inch in length, of a whitish 

 color, and " in thickness, being bluntly pointed at either 

 extremity. Spharularia is everywhere covered by small warts 

 or button-like projections, in all numbering about 800. The 

 warts are transparent, each, according to Lubbock, project- 

 ing from y^o" to T o 6 5o " above the general surface of the integu- 

 ment. There is neither mouth, oesophagus, intestine, nor 



FIG. 85. Sphaemlar'ia bombi. Showing the supposed male in situ. After Lubbock. 



anus ; but in their place a large fatty mass or corpus adiposum. 

 Sir J. Lubbock remarks that this peculiar organ "is homo- 

 logous, not with the whole intestinal canal of nematodes, but 

 only with the intestine ; and we find, in fact, that in Grordius 

 the oesophagus is very short, and opens at once into the 

 anterior end of the corpus adiposum ; so that to pass from this 

 genus to Sph&rularia it would be necessary to shorten the 

 oesophagus a little more, and then the wall of the corpus 

 adiposum would be immediately attached to that of the body. 

 So far, therefore, as concerns the corpus adiposum and the 



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