HYDROIDS FROM THE BERMUDAS. 



261 



occurrence, from off the Bermudas, thirty fathoms, widens the 

 geographical range considerably northwards. 



Aglaophenia cylindrata, Versluys, 1899. 

 There is little to distinguish the trophosome of this species 

 from that of A. rhynchocarpa, Allman, and indeed, were it not 

 for the rather marked differences in the corbulae — that of the 

 former having been described by Jaderholm,* that of the latter 

 by Allmanf and Nuttingt — one would be tempted to regard the 

 two designations as synonymous. In the examples growing 

 over C. insignis, corbulae are unfortunately absent, and in identi- 

 fying them with A. cylindrata I have relied upon the different 

 proportions of the hydrotheca, the less marked concavity of the 

 anterior profile, and upon the fact that in every point the 1 Chal- 

 lenger ' specimens agree with the minute and careful description 

 and figures of Versluys. There is considerable diversity in the 

 shape assumed by the chitinous distal end of the hydrothecal 

 keel. 



Dimensions : — Length of colony up to 20 mm. Stem inter- 

 nodes: length, 0*29-0 * 34 mm.; diameter, 0*15-0'22 mm. Hydro- 

 theca : length, 0*24-0;27 mm. ; diameter at mouth, 0*14 mm. ; 

 proportion of adnate part of mesial sarcotheca to length of hydro- 

 theca, less than one-third. 



The species has hitherto been found only in the Antilles : 

 from Testigos Islands (Versluys), and from Anguilla (Jaderholm). 

 Tlie present record, " off Bermudas, thirty fathoms," is much 

 further north. 



These species were climbing on the specimens described by 

 Allman in 1888 as Campanularia insignis. Dr. Billard, having 

 examined the type specimens of this species in the British 

 Museum, declares that they do not differ from C.juncea (Lyto- 

 scyphus juncea) of the same author, both of these being synonyms 

 of Esper's species, Lytoscyphus fruticosu8.§ 



* Jaderholm, E., 'Arkivfor Zool., utg. af Kgl. Svenska Vetenskapsakad.' 

 1903, p. 297, pi. xiv. fig. 2. 



f Allman, J. G., 1877, 'Mem. Mus. Comp. Zoo. Harvard,' vol. v. No. 2, 

 p. 40, pi. xxiii. fig. 8. 



t Nutting, C. C.,1900, " American Hydroids. Parti. The Plumularidse,** 

 p. 90 (Spec. Bull. Smithson. Inst. Washington). 



§ Billard, A., " Sur les Haleciidcz, Campanulariidce,Qt Sertidariidcc du 

 Challenger" (Comptes rendus Acad. Sc. Paris, Dec. 14th, 1908, p. 1). 



