1 S-J THE VOYAGE OF H.M.S. CHALLENGER. 



Subfamily Vogtid^e. 



Genus 35. Vogtia, 1 Kolliker, 1854. 

 Vogtia, Kolliker, Schwimmpolypen von Messina, p. 37. 



Definition. — Polypkyidae with pentagonal prismatic nectophores, the ostium of which 

 is provided with five prominent apophyses. (Cormidia monoclinic. Gonophores attached 

 to the base of the siphons.) 



The genus Vogtia, established by Kolliker for the Mediterranean Vogtia pentacantha, 

 differs from the two preceding genera mainly in the prismatic form of the pentagonal 

 nectophores. Since this difference is similar to that between Diphyes and Praya, it 

 perhaps justifies the distinction of two subfamilies : Vogtidas (derived from Diphyidas) 

 with pentagonal exumbrella of the prismatic nectophores, and Hippopodidse (derived 

 from Prayidae) with an edgeless exumbrella of the rounded nectophores. Probably the 

 general composition of the nectosome as well as of the siphosome in Vogtia is similar to that 

 in Hippopodius. But neither the first description of Kolliker (4), nor the supplementary 

 remarks of Claus (35), and Keferstein and Ehlers (33), are sufficient to give a full idea of 

 its anatomy. The last named authors have described a second species, Vogtia spinosa, 

 from the coast of Brazil (33, p. 24). Similar to this are some scattered nectophores, 

 which I found in the Challenger collection, taken in the South Atlantic (Station 326) ; 

 they are here described as Vogtia kblliheri. 



Vogtia kollikeri, n. sp. (PI. XXIX. figs. 9-14). 



Habitat.— Station 326, South Atlantic; March 3, 1876; lat. 37° 3' S., long. 

 44° 17' W. Surface. 



Nectophores (fig. 9, lateral view, right side ; fig. 10, oblique lateral view, half dorsal, 

 half right side ; fig. 11, basal view of a younger, fig 12, of an older nectophore; fig. 13, 

 ventral view; fig. 14, dorsal view). — The nectocalyces have a cartilaginous consistence, 

 vitreous aspect, and the general form of a flat pentagonal prism. The largest nectophore 

 has a length of 6 mm., a height of 10 mm., and a breadth of 16 mm. The two large 

 terminal faces of the prism are nearly parallel and pentagonal, an inferior (and abaxial) 

 basal face, and a superior (or axial) apical face ; this latter contains the broad ventral or 

 axial groove, bounded by the two lateral wings. The five lateral faces of the prism are two 

 paired dorsal, two paired ventro-lateral and an odd medio-ventral face ; this latter is the 

 smallest face and deeply bisected. 



The basal face of the nectophore (fig. 11, of a younger, fig. 12, of an older specimen) 

 contains in its middle part, nearer the axial side, the ostium of the uectosac (w) ; it is 



1 Vogtia, named in honour of Carl Vogt. 



