94 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



67. A. occidental is, SI), nov. Off Washington; 40 to 97 fms. 



68. A. ruhellus, sp. nov. Oft' San Pedro, California; 20 to .50 fms. 



69. A. Jiarescens, si>. now Coast of California. 



70. A. leptacanthus, sp. nov. Off' San Pedro, California; 20 to 50 fms. 



71. .1 ./)(/(• /^s•. sp. nov. Southern California. 



72. .1. hnnmeus Griffin, Puget Sound. 



73. A. <lr('prmnj>hornirIe.<t Griffin. Puget Sound. 



7-4. DrejMiiophorns ritteri, sp. nov. Off southern California; 50 to 150 

 fms. 



75. Tetrastemnia sit/uifer Coe. San Pedro, California. 



76. T. nigrifrons Coe. Monterey Bay. California. 



77. T. hicnlor Coe. Kadiak. Alaska. 



78. T. aherrans Coe. Paciffe coast of Alaska. 



79. T. alhiduin, sp. nov. Coast of California. 



80. T. hilineatum Coe. San Diego, California. 



81. T. (luadrilineatum Coe. San Pedro, California. 



82. T. (Oerstedia) dorsale (Abildgaard). Monterey Bay, California; 

 northern coasts of Europe ; Mediterranean Sea ; east coast of United 

 States. 



83. T. (Oersted id) reticulatwn Coe. San Pedro, California. 



84. T. caecum Coe. Kadiak, Alaska. 



84a. Stichostemma , sp. Fresh water pools, Washington. See p. 91. 



85. Pkinktnnemertes agassizii Woodworth. Surface in equatorial regions 

 between 79° and 90° \< . Long. 



Bdeli.onemertea. 



86. Malacohdella sp. Pacific Grove, California. 



When not otherwise particularly noted, all of the species enumer- 

 ated haA e l)een collected on the shore between tides, on piles of 

 wharves, or dredged from shallow water near the shore. They 

 should not be considered as strictly littoral forms, however, for most 

 of them probably range from between tides to a depth of 50 fathoms 

 or more. 



Keys to Groups and Species'. 



For convenience in determination, the species at present known 

 from the west and northwest coasts of iSorth America, from Panama 

 to the Bering Sea and Arctic Ocean, may be arranged in the follow- 

 ing analytical table, based mainly on superficial and easily distinguish- 

 able characters. 



