408 PROCEEDINGS OF THE NATIONAL WV&EUM. vol.38. 



7. Family El TI N< »s« >M 1 1 >.F. 



28. < tenus Ectinosoma. 



39. E. curticorne Boeck, Wick ford, and Charlestown Pond, Rhode Island, 



summer (Williams) ; brackish pond, Woods Hole, July. 



40. E. normani Thompson and Scott, Charlestown Pond, summer (Williams), 

 s. Family PELT1 Dl IBM. 



29. Genus Alteutha. 



41. A.depressa Baird, Sheepshead Bay, New York, September; Woods Hole, 



August. 

 9. Family TEGASTID^J. 



30. Genus Parategastes. 



42. /'. sphsericus (Claus), Wickford and Charlestown Pond, Rhode Island 



(Williams), 

 in. Family IDYIID.F. 



31. < renus Idya. 



13. I.furcata (Baird), Narragansetl Bay, Bpring, common (Williams); Little 

 Earbor, Woods Hole, July. 

 11. Family 'rilAl.KSTItlli.lv 



32. Genus Thalestris. 



44. T. gibba (Kroyer), Woods Hole, December, "Surface net" (Vinal N. 



Edwards). 



33. Genus Halithalestris. 



45. Tl.croni (Kroyer), Grampus station 528, July; also station 627, July; Cape 



Cod. 



34. Genus Dactylopusia. 



46. D. thisboides (Clans), Little Harbor, Woods Hole, July. 



47. D. vulgaris Sars, Wickford and Charlestown Pond, Rhode Island, Juiy 



(Williams); Woods Hole, common. 

 L2. Family DIOSACCID^J. 



35. < renus Diosaccus. 



18. /'. tenuicornis (Claus), < !harlestown Pond. Rhode Island, July (William- . 

 Eel Pond, Woods Hole, August. 

 L3. Family LAOPHONTID.E. 

 i renus Laophonte. 



49. /.. longicaudata Boeck, Woods Hole, July. 

 11. Family LICHOMOLGID^J. 



37. Genus lAchomolgus. 



50. L. fucicolus Brady, Wickford and Charlestown Pond, Rhode Island 



i Williams i; Buzzard's Bay, July . 



51. /.. adherens Williams, Wickford, Rhode Island, under stones, between 



tides | Williams). 



52. L. major Williams, Wickford, Rhode Island, mantle cavities of Mya, 



Vi nus, and Mactra (William* i. 

 L5. Family T.\< II 1 1>IIL\E. 



38. < renus Tachidius. 



53. '/'. brevicornis (Muller), Charlestown Pond, Rhode Island i Williams); 



Jamaica l'o\ . New York, June. 



54. T. littoralis Poppe, upper Narragansetl Bay, Maj and April (Williams). 

 Hi. Family <>\< .FIP.F 



< [enus Oncxa. 



ista Philippi, Gulf Stream 60 miles south of Marthas Vineyard, July 

 (Wheel 



