210 



GRIFFIN. 



9. Amphiporus imparispinosus n. sp. 



Length in alcohol, 40—45 mm. Breadth, 1-2 mm. 



Color. 



white. 



Fig. 19. Amphipor- 

 us itnparispinosu^ 

 n. sp. 



'Camera lucida, from 

 living worm un- 

 der influence of 

 chloral hydrate 

 and compressed 

 under cover slip. 



Head in extension hemispherical, broader than body. 

 Eyes numerous (23 ± on each side), distrib- 

 uted in two elongated concentric groups along 

 antero- lateral to lateral margin of head, not ex- 

 tending behind brain as in Zygonnnertes vircs- 

 ccns ( Verrill) (fig. 1 9). Body widest anteriorly, 

 tapering off to a slender posterior extremity. 

 Internal Anatomy. Mouth opens into 

 rhynchodeum. Cephalic gland not prominent. 

 Cephalic commissure^ above proboscis-pore. 

 Cephalic organs in front of brain, dorso-lateral 

 to ventral ganglia, opposite mouth ; the canals 

 open ventrally just behind 

 proboscis-pore. Nephridia 

 commence behind brain 

 and open to exterior by 

 numerous efferent ducts, just dorsal to 

 nerve-cords. Nephridia cease just behind 2d 

 or 3d pair of gonads. Intestinal caeca extend 

 to brain. Apparently no integumentary 

 glands in body. Rhynchocoelom does not 

 extend quite to posterior extremity. Central 

 stylet as long as basal portion, latter con- 

 stricted in middle (fig. 20). Three marginal- 

 stylet-pockets, each containing two stylets. 

 This species is apparently to be distin- 

 guished from A. dttbiiis Hubrecht, by its 

 numerous eyes and paler color, and from 

 A. Grccmnamii Montgomery, by its larger 

 size, greater number of eyes and distribu- 

 tion of eyes and color of body. 



Habitat and Distribution. On piles 

 and stones. Port Townsend and Sitka. 



•Ri 



Fig. 20. Amphiporus i))i- 

 paripiiiosus n. sp. 



Stylet region of proboscis. 

 Camera lucida from to- 

 tal preparation. Rs. 

 reservoir. 



^ By cephalic commissure is here meant that connecting the blood vessels an- 



.teriorly. 



