288 ' ENDEAVOUR " SCIENTIFIC RESULTS. 



Sertularella lata, Levinsen, Vidensk. Medd. fra den naturh. 

 Foren, 64, 1913, p. 312. 



Not Sertularella lata, Billard, Arch, de Zool. exp. et gen., 

 (4), vii., 1907, p. 346, fig. 4. 



I have referred to this species in Part I under its original 

 name of Thuiaria lata, but for the reasons already stated I 

 now class it under the genus Sertularella. 



With regard to its specific affinities much confusion exists. 

 A number of hydroids have been referred to the species by 

 different observers, some of which may possibly be rightly 

 placed, while others have the gonangia so unlike those of 

 S. lata in every particular that it is difficult to understand 

 why they should have been associated with it. Apparently 

 there are two species 1 (at least) closely resembling each 

 other in the trophosome, but differing widely in the form of 

 the gonangia. No fertile specimens of S. lata have been 

 observed except a single one from Port Phillip, Victoria, 

 collected by the late Mr. J. Bracebridge Wilson. 



The following list includes the forms which have been 

 regarded by other observers as specifically identical with 

 S. lata : 



Sertularia tridentata, Lamouroux, Hist. Polyp. Cor. Flex., 

 1816, p. 187. 



Thuiaria diaphana, Busk, Allman, Jo urn. Linn. Soc., Zool., 

 xix., 1885, p. 145, pi. xviii., figs. 1-3. 



Thuiaria hyalina, Allman, Rep. Sci. Results " Challenger " 

 Exped., Zool., xxiii., Hydroida, pt. II., 1888, p. 69, 

 pi. xxxiii., fig. 2-2a. 



Sertularella lata, Nutting, Amer. Hydr., II., Sertulariadse, 

 1904, p. 85, pi. xviii., fig. 10 ; Id., Nutting, Bull. U.S. 

 Fish. Comm., 1905, p. 948. 



Sertularella Torreyi, Nutting, Bull. U.S. Fish Comm., 1905, 

 p. 949, pi. iv., fig. 4, pi. xi., figs. 2-3. 



Sertularella lata, Billard, Arch, de Zool. exp. et gen., (4), 

 vii., 1907, p. 346, fig. 4. 



Sertularella speciosa, Congdon, Proc. Amer. Acad. of Arts 

 and Sci., xlii., 1907, p. 476, figs. 24-28. 



1 . Another species having similar hydrothecae is Thecocladium ftabflhnn, 

 Allman. Billard' s figure of this species (Ann. Sci. Nat., Zool., (9), xi., 1910, p. 

 12) really more resembles S. lata than does his figure of " Sertularella lata." 

 (Arch, de Zool. exp. et gen., (4), vii., 1907, p. 346), and would indeed serve 

 admirably for S. lata except for the peculiarity of the pinnae springing from 

 hydrothecae. 



