44 



THE VOYAGE OF H.M.S. CHALLENGER. 



anterior fold in its walls confers on tlio hydrothoca an aspect which, though not confined 

 to the present species, is Ijy no means common. Besides its terminal orifice, the mesial 

 nematophore is provided with a very distinct lateral orifice, close to the point at which 

 it ceases to be adnate to the hydrotheca. 



In the specimen from which the drawings in the plate hnd been made, no gonangia 

 were developed on the phylactocarps. The collection, however, contains another specimen 

 in which they are present, and hero they wore always found singly on the intor- 



Fio. 2. — Pliylaetooarp of Lylocarpxts speclabili'!. 



a. Proximal iuternotle carrying a liydrotlieca. 



h. Second internoile carrying a gonangium. 



c. Representative of the mesial ueniatojiliore of this internoile. 



d. Eepresentative of lateral nematophore. 



e. Continuation of the phylactocarp beyond the gonangium,-l)earing iuternode. 



/,/• Representatives of the Literal neraatophores belonging to the interuodes of this continuation, 

 g. Gonangium. 

 h. Gonophore. 



node which immediately succeeded the proximal or hydrotheca-ljearing internode of the 

 rachis. The phylactocarps which thus carried gonangia had also undergone a peculiar 

 modification, which consisted partly in an enlargement both in length and width of 

 the gonangium-bearing internode, the solitary gonangium being borne by a rounded 

 prominence which lay between the two lateral spines of the internode, while in 

 this internode there also existed a small mesial spine, by which the gonangium Avas sub- 

 tended, and which did not exist in the others. Further, the whole of the more 



