coe: nemerteans of west and noethwest coasts. 245 



56. Amphiporus nebulosus Coe. 



Proc. Wash. Acad. Sci., 3, p. 48, PL 4, fig. 1 ; PI. 8, fig. 6; PI. 11, 

 fig. 1 ; Harriman Alaska Expedition, 11, p. 48, 1904. 



PI. 22, figs. 157, 158 ; Text-figs. 3, 50. 



Body of moderate proportions, much flattened ; rhynchodaeum 

 opening subterminal. Length com- 

 monly 10 to 15 cm. ; ^-idth 5 mm. 



Color. — -Dull white or grayish, 

 often with a yellowish tinge, very 

 thickly mottled on dorsal surface 

 with confluent blotches and dots of 

 dark brown color ; A'entral surface 

 grayish, often ^nth tinge of yellow. 



Ocelli. — On each side of head 

 there are commonly 18 to 28 ocelli, 

 arranged in two irregular groups (PI. 

 22, fig. 157). On each antero-lateral 

 margin is a single row of 4 to 6 rather 

 large ocelli, which continues ]iosteri- 

 orly into an irregular, marginal group 

 of 8 to 12 smaller eyes; while an 

 irregular cluster of 7 to 10 small 

 ocelli lie just in front of brain and 

 deep in the tissues of the head. 



Proboscis. — Provided with usually 

 17 nerves. Central stylet very slen- 

 der, of about the same length as basis, 

 which is very broad and flattened pos- 

 teriorly (PI. 22, fig. 158; Text-fig. 50). 



Submnscidar glands enormously developed (Text-fig. 3), extend- 

 ing nearly the whole length of esophageal region. 



Intestinal caeca extend forward well toward the brain. 



Nephridia situated in anterior portion of esophageal region ; 

 there is a single pair of efferent ducts, opening ventro-laterally. 



Cerebral sense organs well developed, situated in front of brain. 



Reproductive organs. — Sexual products mature in July ; they 



Fig. 50. — Amyhiporus nebulosus. 

 Outline of stylet apparatus of pro- 

 boscis. 



