REPORT ON THE SIPHONOPHOR^E. 213 



uvaria .'). Kolliker (4) aud the following observers, who described in the years 1853 

 to 1863 the Mediterranean Apolemia uvaria (called Agalma punctata by Vogt, 6), 

 supposed that these two species were identical. But a comparison of both has convinced 

 me that they belong to different genera. The internodes of the long tubular siphosome 

 are naked in the Mediterranean Apolemia uvaria, whilst they are densely covered with 

 bracts in the North Atlantic Apolemopsis uviformis (or Apolemia lesueuria) ; the corms are 

 dioecious in the former, monoecious in the latter. I retain, therefore, the name Apolemia 

 uvaria, now generally accepted for the Mediterranean form, for this type of the genus, 

 the gigantic corm of which attains a length of two or three metres and more. Compare 

 the descriptions of the corm by Vogt (6), Gegenbaur (7), and Leuckart (8), of the necto- 

 phores by Kolliker (4), and of the gonophores by Claus (35). 



Genus 406. Apolemopsis, 1 Brandt, 1835. 



Apolemupsit, Brandt, Prodromus, 25, p. 36. 



Definition. — Apolemidse with a biserial nectosome, composed of two opposite series 

 of nectophores. Internodes of the siphosome densely covered with bracts. Cormidia 

 polygastric and monoclinic, each with several siphons and cystous, and with two separate 

 gonodendra, a male and a female. Corms monoecious. 



The genus Apolemopsis was established by Brandt (25) for an Apolemid, which 

 Mertens had observed in the Tropical Pacific, near the Caroline Islands. Comparing his 

 accurately drawn figures with the splendid pictures which Lesueur had given in 1813 of 

 his North Atlantic Stephanomia uviformis, I suppose that these two similar forms may 

 be distinguished as two species of one genus. This genus, for which I retain Brandt's 

 name Apolemopsis, seems to differ from the true Apolemia (uvaria) in two essential 

 characters. The entire siphosome of Apolemopsis is densely covered with innumerable 

 bracts, as in Agalmopsis, whilst in Apolemia the long internodes between the cormidia 

 are naked, as in the Diphyidaj. The corms of the former are monoecious, those 

 of the latter dioecious. Each siphon possesses in Apolemopsis four liver-ridges (as in 

 Dicymba), in Apolemia six. A further careful comparison, however, of the two 

 genera, as well as of the different species belonging to them, is necessary by future 

 observers. 



Family XIII. Acalmidj, Brandt, 1835. 



Agalmidx, Brandt, Prodromus, &c, 1835, 25, p. 34. 

 Steplianomidx, Huxley, Oceanic Hydrozoa, 1859, pp. 70, 72. 



Definition. — Physonectae polygastricae, with a long tubular stem of the siphosome, 

 bearing numerous siphons, palpons, and bracts, each siphon provided with a branched 



1 Apolemopsis = Similar to Apolemia. 



