NO. 13 COE : REVISION OF THE NEMERTEAN FAUNA 297 



Reproduction. Sexual products are mature in summer in northern 

 localities and as early as February and March in southern California. 

 The females ovulate several times during the season, producing relatively 

 few, large, opaque, grayish green ova at each ovulation. The mature 

 ovum is more than % the diameter of the body in small individuals. Fer- 

 tilization takes place at time of ovulation. Development is rapid, the 

 free-swimming larva leaving the egg within 24-48 hours. The ciliated 

 ovoid larva is provided with a long anterior flagellum. Two or 3 days 

 later the larva becomes elongated and wormlike and then settles to the 

 bottom. A single pair of ocelli first appears on the anterolateral margins 

 of the brain, followed by a second pair of much smaller ocelli slightly 

 behind the brain. 



Genus AMPHIPORUS Ehrenberg 



This genus appears to be represented on the North Pacific coast by at 

 least 17 species, although the generic status of A. gelatinosus is in doubt 

 and there is some question about the specific distinction of A. pacificus and 

 A. rubellus. Only one of these 17 species has been reported from other 

 parts of the world. 



Key to Species 



1. Body very gelatinous, with an enormous development of body 

 parenchyma. Body short and broad ; ocelli large, 30 or more on 

 each side of head ; cerebral sense organs extremely small, situated 

 in front of brain A. gelatinosus 



1. Body contains only a moderate amount of parenchyma ... 2 



2. Body very slender; white or lightly tinted with red or yellow, 

 without spots 3 



2. Body not very slender ; color red, brown, purplish, orange, deep 

 yellow, or spotted 5 



3. Blood vessels bright red ; stylet basis very slender ; ocelli in single 

 row on each side of head cruentatus 



3. Blood vessels not red ; stylet basis truncate conical or pear 

 shaped; ocelli in several irregular rows or groups 4 



4. With 2 or 3 pouches of accessory stylets .... imparispinosus 



4. With 6-12 pouches of accessory stylets formidabilis 



5. Central stylet not more than half as long as basis 6 



5. Central stylet nearly as long as basis or longer 7 



