Castle. — Rhynchobdellidae. 



PLATE 8. 



Fig. 32. G. parasitica, var. plana. Dorsal view of liead end of an individual from 

 Havana, Illinois, in which the division between rings 2 and 3 was not 

 evident. Stippling shows position of yellow pigment in a median vitta 

 and (on left side) in metameric marginal spots. From an alcoholic 

 specimen. X 41. 



Fig. 33. G. parasitica, var. rugosa. Dorsal view of head end of an individual from 

 Cambridge, Mass., showing the usual annulation of somites i.-iii. From 

 an alcoholic specimen. Enlarged. 



Fig. 34. G. stagnalis. Dorsal view of posterior end of body. Enlarged. 



Fig. 35. G. heteroclita. Dorsal view of head end of a living animal, showing most 

 common position of eyes. Enlarged. 



Fig. 36. A dorsal view of the head end of the individual represented in Figure 

 38. The anterior ring of somite vi. is seen to contain traces of a trans- 

 verse pigment line. Drawn from the living animal. Enlarged. 



Fig. 37. G. par-asitica, var. plana. Dorsal view of posterior end of body of the 

 individual shown in Figure 32. Marginal ligiit spots indicated by 

 stippling. X 24. 



Fig. 38. G. heteroclita. Dorsal view of a living animal, showing the general form 

 of the body at rest, and the color pattern sometimes present on the 

 dorsal surface. The rings are not indicated, but the numerals are 

 placed opposite and serve to designate those rings in which the 

 pigment is found (the anterior rings of their respective somites). 

 Enlarged. 



