PUGET SOUND NEMERTEANS. 203 



dant as to produce a decussation similar to C. siipcrba. The 

 variation of this structure would appear to show that but little 

 reliance can be placed upon it for specific determinations. A 

 layer of longitudinal muscle fibres separates the oesophagus from 

 the circular muscles of the rhynchocoelom as in C. rubiciinda. 

 Cephalic organs consist of a paired ciliated tube which pene- 

 trates the epithelium to end blindly next the basal membrane. 

 Nephridia consist of branching tubules, portions of which bulge 

 more or less into the lateral vessels. They open at their pos- 

 terior extremity by a pore above the side organs, /. c.^ in trans- 

 verse band 5. 



Habitat and Distribution. Dredged in Kilisut Harbor op- 

 posite Port Townsend, in from 3 to 4 fathoms, also taken under 

 bark of wharf-piles in its tough hyaline tube, as well as in the 

 sand between tides. Likewise taken in and about Sitka Harbor, 

 Alaska. 



This worm grows to a great length ; some incomplete frag- 

 ments when fully extended were over a meter in length. 



2. Carinella rubra n. sp. 



? C. miniata Hubrecht.^ 



Color in life a uniform bright red. In alcohol the pigment 

 quickly washes out, leaving the worm a dull gray. The mature 

 worm reaches an enormous length, some of the smaller indi- 

 viduals (incomplete) measuring over 140 cms., while the largest 

 observed must have been at least two meters in length. 



Internal Anatomy. Well developed glands fill the head 

 (differences from C. polyinorpJid). Cephalic organs are epithe- 

 lial pits which do not reach the basal membrane. Dorsal and 

 ventral decussation of circular muscles absent or very weak. 



Habitat and Distribution. Taken in sand and silt between 

 tides at Puget Sound (Bremerton), Kilisut Harbor, and Sitka, 

 Alaska. 



' Biirger ('95) figures a red species (C. uiiniata Hubrecht) which may possi- 

 bly be identical with this species, but since no sections were obtained its identity 

 with C. rubra can be but a matter of conjecture. In color, size and form of head 

 they differ not a little. In form and size C. rubra more nearly resembles C. poly- 

 iHorp/ia. 



