THE HYDROIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 65 



Locality. — " Growing on a sponge, Port Stanley, Falkland Islands. 3rd February 

 1904." 



Previous records are from Port Louis and Port Albemarle, Falkland Islands (Jader- 

 HOLM, 1905); Southern Tierra del Fuego, and Island Picton in the neighbouring 

 archipelago (Hartlaub, 1905). 



Plumularia ecJiimdata, Lamarck, 1836. 



in addition to a previously mentioned occurrence at Cape Town, a second locality, 

 also in Cape Colony, has to be recorded, namely, Saldanha Bay. The specimens from 

 this place, while rather smaller in size than the Cape Town examples, are similar in 

 minute structure, except that in the former the hydrotheca-bearing internodes are rather 

 shorter, and the hydrothecse therefore more congested, than in the latter. 



The gonangia are elongate oval, considerably longer in proportion to their diameter 

 than those figured by Hinck.s (1868, pi. Ixv., fig. 26), and possessing shorter and 

 more regularly arranged spines. They stand out from the median aspect of the stem 

 in a densely packed row. 



Locality. — Shore, Houtjes Bay, Saldanha Bay, Cape Colony. 19th May 1904. 



Plurmdaria lageyiifera, var. septifera, Torrey, 1902. 



Whereas typical specimens of P. lagenifera are al)out three inches long, are some- 

 times branched, and grow in flexuous clumps, the specimens which I have referred to 

 Torrey's variety are short (only 7 mm. high), never branched, and are markedly rigid 

 in habit. The detailed structure is that of a compressed P. lagenifera, where the inter- 

 nodes have become shorter and comparatively stouter, while the internal septa have 

 become more distinct. In conjunction with the general shortening it has come 

 about that in the intermediate internodes there is generally but one septum, 

 although our specimens differ from those described by Torrey — where " no intermediate 

 internode has more than one septal ridge " — in that, in several, there are traces of a 

 second ridge on the distal side of the nematophore, while in at least one case the second 

 ridge is quite pronounced. Torrey is equally emphatic that '' there is never more than 

 one internode between thecate internodes," but I have observed a case in which two 

 successive athecate internodes occurred, the distal being much the shorter and lacking 

 a nematophore. There was no evidence that this duplication was due to abnormal 

 growth, such as regeneration. These variations, however, only show more clearly the 

 relationship between this form and P. lagenifera type, and confirm Tokrey's placing of 

 it as a variety of that species. 



In one point the Scotia specimens differ both from the type and from the variety, 

 for they show no trace of a nematophore on any internode " on side opposite branch 

 [i.e. hydroclade] and immediately distal to the proximal septum." 



(ROY. SOC. EDIN. TRANS,, VOL. XLVIL, ST.) 



