NEMERTEANS 117 



teriorly behind dorsal ganglia ; canals open in front of ventral 

 commissure. Differs from all the preceding species in small- 

 ness of rhynchocoel, which is enclosed in a thick muscular sheath 

 in which longitudinal and circular muscles are interwoven. 

 No intestinal csecum ; circular muscle-layer quite thick. 



The species is known only from the above description, and is 

 truly remarkable because of the absence of the intestinal caecum. 

 No specimens or slides showing any such peculiarity were con- 

 tained in Griffin's collections, however, when they were turned 

 over to the writer. 



11. Linens striatus Griffin. Puget Sound. Color notes and 

 drawings lost by shipwreck. " Color brownish red on dorsum, 

 sharply marked off laterally from the much lighter ventral por- 

 tion. Dorsum marked by numerous creamy white transverse 

 bands which cease at demarcation-line between the dorsal and 

 ventral coloring. Tip of head brilliant red. Length probably 

 not over 4 cm." Nephridia have numerous efferent ducts. 



These characters resemble those of very small individuals of 

 Af. verrilli in many respects, and the two species may possibly 

 be identical. Perhaps Griffin's form is more closely similar to 

 Stimpson's Cerebratulus impressus (= Micrura tmpressa) from 

 Bering Strait. 



12. Cerebratulus marginatus Renier. Puget Sound. 



13. Z-/wssp.? Puget Sound. Smoky black with greenish 

 tinge dorsally, grayish brown ventrally. Probably = Lineus 

 viridis (Fabr.) Johnston, which is recorded from southern Alaska 

 (Coe, loc. cit., p. 65). 



14. Cerebratulus sp. ? A very large, dark species with flesh- 

 colored margins ; fragments measuring nearly 20 mm. in diam- 

 eter after preservation. No locality given, but the species is in 

 all probability C. herculeus Coe, which is also recorded from 

 southern Alaska. 



Careful comparison of Griffin's notes, drawings, and material 

 indicates that eight of the twelve above-named species were new 

 at time of publication. Five of the eight must be retained in 

 place of five of my own names, as stated above. Two other 

 new species {Amphiporus brunneus and A. drcpanophoroides) 

 cannot be referred to any forms which have come into my 



