PHYSOPHORA HYDROSTATICA. 



293 



Physophora hydrostatica Foeskal. 

 Plate 16. 



Physsophora hydrostatica ForskAl, 1775, p. 114; 1776, tab. 33, fig. e., Modeer, 1789, p. 280; Gmelin, 

 1790, p. 3159; Eschscholtz, '29, p. 145; Gegenbaur, '60, p. 382, taf. 30; Glaus, '60, p. 295. 

 taf. 25-27; Chun, '97b, taf. 2, taf. 3, fig. 3-6; Schneider, '98, p. 126; Len.s and Van Riemsdijk, 

 :08, p. 86, pi. 16, fig. 120-122. 



Physophora muzonema P£ron and LfeuEUR, '07, p. 43, taf. 29, fig. 4; Costa, '36, p. 7-12, taf. 3. 



Physophora nicea Griffith, '21, pi. 5, fig. 3. 



Physophora forskdl QuOY and Gaimard, '24, p. 583, pi. 87, fig. 6. 



Physophora disticha Lesson, '26. pi. 16, fig. 3; '30, p. 49. 



Rhizophysa discoidea QuoY and Gaimard, '27, p. 179, pi. 5, B, fig. 1-3. 



Discolabe mediterranca E.schscholtz, '29, p. 156. 



Rhodophysa discoidea Blainville, '30, p. 112, '34, p. 123. 



Physophora discoidea QuoY and Gaimard, '34, p. 59, pi. 1, fig. 22-24. 



Physophora ambigua Brandt, '35, p. 32, 



Physophora rosacea Della Chiaje, '42, tab. 33, fig. 2. 



Physophora telrasticha Phillippi, '43, p. 58, taf. 5. 



Physophora glandijera Sars, '50, p. 158. 



Physophora vesiculosa Sars, '50, p. 159. 



Physophora philippi Kolliker, '53, p. 19, taf. 5. 



Stephanospira insigiiis Gegenbaur, '60, p. 67, taf. 33, fig. 53-56. 



Physophora magnifica Haeckel, '69a, p. 36, taf. 3; Chun, '88, p. 32. 



Physophora borealis Sars, '77, p. 32, taf. 5, taf. 6, fig. 1-8. 



Discolabe mediterranea Haeckel, '88b, p. 263 (non Eschscholtz). 



Station 4663 300 fathoms to surface 1 specimen 

 " 4676 " " " " " " 



i i 4.707 ' * " ' ' " ' ' ' ' 



7 mm. in length. 

 40 mm. " " 

 12 mm. " " 



" 4709 " " " " " " 16 mm. " ". 



" 4713 " " " " •• " 22 mm. " " 



also 

 10°14'N. 96°28'W. 200 " " " " " 15 mm. " " 



Fragmentary and much contracted in alcohol. 



The anatomy of this species has been so carefully studied that repetition is 

 unnecessary here, further than to note that I have examined the excretory pore 

 of the pneumatophore to determine whether it opens into the pericystic cavity 

 (gastrovascular space) as Chun has described it, or into the cavity of the air sac 

 as Schneider ('98) has maintained. In both cases, the actual conditions, which 

 are readily demonstrated by gross dissections of such large pneumatophores 

 as those of Physophora, as well as by sections, support Chun's statement. To 

 make comparison with Atlantic specimens easy for other students, a series of 

 photographs illustrating the more important external features of the Pacific 

 individuals are reproduced (Plate 16). 



