THE PLUMULARin.E. 



87 



? GATTYA Allman. 1 

 Gallya ALI.MAX, .Tonrn. Linn. Soc., Zool., 1885, XIX, p. 155. 



Trophosome. Hydrocaulus consisting of hydrocladia which spring from a creeping stolou or 

 from one another through the intervention of a jointed peduncle, and are divided into distinct 

 internodes, each iuteruode carrying a hydrotheca. Hydrotliecie with dentate margin; mesial 

 nematophores fixed, not adnate to the hydrotheca; lateral nematophores movable. 



Gonoxome Gouaugia destitute of special protective apparatus. 



Professor Allmau regards this genus as belonging to the Eleutberoplea, although it has marked 

 relations with the Statoplea in having a fixed mesial uematophore and hydrothecal teeth. The 

 peduuculated liydrocladia constitute a feature which I believe to be unique among the Pluiuularidte, 

 the peduncle consisting of several short internodes devoid of hydrocladia. 



GATTYA HUMILIS Allman. 



(Plate XVII, figs. 10, 11.) 

 Gattya Iiumilia ALLMAN, Jouru. Linn. Soc., 1885, XIX, p. 156, pi. xxiv. 



Jfrophosome. 2 Hydrocladia borne along the length of a creeping tubular stolon, from which 

 each springs by a cylindrical jointed peduncle, occasionally sending oft' a branch which springs 

 in a similar way from the hydrocladium which carries it; iuteruodes of hydrocladia separated 

 from one another by very distinct joints. Hydrotheca- boat-shaped, adnate to the internode by 

 the whole epicauline wall; aperture with a strong tooth on either side and another in front; no 

 iutrathecal ridge; mesial neinatophore short, with a wide cup shaped termination, separated by a 

 short interval from the hydrotheca; lateral nematophores trumpet-shaped, supported on short 

 styloid processes which are given oft' on a level with the hydrothecal margin. 



(ionosome. Gonangia pyriform with a broad truncated summit, springing each by a narrow 

 jointed peduncle from the side of an internode close to the posterior wall of the hydrotheca. 



Locality. Unknown. 



I include this remarkable form here, although it is not known to be an American species. It 

 was found by Professor Allinau among the species collected by Miss Gatty, many of which came 

 from America. The figure given with the original description represents 0. ItumiUs as growing on 

 an alga, apparently. 



The species is of such unusual interest from a morphological standpoint that it is desirable to 

 include it here for the purpose of calling the attention of American students so that they may be on 

 the lookout for it. 



Distribution of the American yeneru of Statoplean PlwmularidcE. 



1 The interrogation mark preceding the name of this gemis is placed there to ;all attention to the fact that it is 

 not known to he American. 



-Original description quoted entire. 



