IMILLIPEDS OF FAMILY LYSIOPETALIDAE LOOMIS 



Figure 18. — Species of Heptium 



Or-e. Heptium scamillatum : a. Lateral view of gonopod ; h, lateral view of apex of sono- 

 pod ; c, outline of poriferous carina from near middle of body ; d, segments 17 and 

 18, showing transition to full number of dorsal crests ; e, anterior view of seventh 

 legs of male (outer joints of one leg not drawn). 



f-j. H. carinellum : f. Outline of poriferous carina near middle of body ; g, lateral view 

 of gonopod ; h, anterior view of eighth leg of male, showing the eight distinct 

 joints ; i, anterior view of reduced seventh legs of male, showing difference in size 

 and structure of coxal spines and the full number of eight joints of the leg ; /, 

 anterior view of one of reduced seventh legs of male showing greatly produced 

 coxal spine and a total of only seven distinct leg joints. 

 k. Diagrammatic sketch of segments 4, 5, and 6 of the American species of Lysiopeta- 

 lidae, showing the dorsal primary crests and the transition of the setae from 

 their anterior to their posterior ends, 

 (e, h, i, and j are. drawn to same scale.) 



