120 BIOLOGICAL SURVEY OF 



Orthopyxis L. Agassiz 

 O. CALicuLATA (Hiiicks). (Nuttiiig, 1915, p. 64, pi. 15, fig. 1.) 

 Attached to other hydroids, depth 20 to 58 feet. Stations: 

 D 12, 70. 



Clytia Lamonroux 



C. cylindrica (L. Agassiz). (Nutting, 1915, p. 58, pi. 12, 

 figs. 6-7.) Chiefly found attached to other hydroids, from 

 low water to 150 feet. Stations : D 18, 37, 39, 44, 52, 56, 60, 

 75,83; S12, 14. 



C. BicoPHOEA (L. Agassiz). (Nutting, 1915, p. 56, pi. 12, 

 figs. 1-3.) Habitat similar to the preceding, shore to 239 feet. 

 Stations : D 32, 34, 36, 56, 130 ; S 14. 



Obeli A Peron and Lesueur 



In the absence of the gonosomes the species of this genus 

 are difficult to distinguish, as the trophosomes are quite vari- 

 able, and, in many species, very similar. 



0. DicHOTOMA (Linne). (Nutting, 1915, p. 80, pi. 20, fig. 7.) 

 Attached to a variety of solid objects, from shore to 47 feet ; 

 a common species where found. Mature in July. ^Medusae 

 found at S 24, June 25, 1927. Stations: D 3, 4," 10; S 4, 11, 

 12, 14, 24. 



0. GENicuLATA (Limic). Nutting, 1915, p. 73, pi. 18, figs. 

 1-5.) Uusually noted as attached to algae, shore to 60 feet. 

 Stations: D 3, 55, 103; S 12, 14, 24. 



0. LONGissiMA (Pallas). (Nutting, 1915, p. 85, pi. 23, figs. 

 1-3.) In similar situations to the preceding, from shore to 

 220 feet. Gonosomes were abundant about the end of June, 

 1927. -Stations: D 15, 24, 39, 44, 51, 94; S 4, 14, 24, 28, 29. 



0. coMMissuRALis McCrady. (Nutting, 1915, p. 83, pi. 21, 

 figs. 1-5.) Attached to shells and Laminar la, shore to 156 

 feet. Stations : D 18, 52 ; S 14, 24. 



0. GRACILIS (Calkins). (Fig. 30.) (Nutting, 1915, p. 78, 

 pi. 19, figs. 2-4.) Taken with other species to a depth of 

 330 feet. This is the first record of the species from the 

 Atlantic coast. It was described from Puget Sound. Sta- 

 tions : D67; S14, 31. 



