6o 



see two deeply emarginate lobes which slightly overlap each other. Comparing Sars' tigures 

 (PL 7, fig. 16) one sees the great resemblance that exists between S.\rs' specimens and ours. 

 The nectosac is e.xtremely muscular; it has the shape of a Phrygian cap; its top is rounded; 

 ventrally it is somewhat enlarged, so is the gelatinous substance on that side. The canals in the 

 nectcsac have the same course as in Galeolaria qtiadrivalvis, that is to say the lateral canals 

 are connected through a small side-canal to the ventral one; this occurs in the posterior third 

 part of the nectosac. The somatocy.st is small (about ^c, of tl^e whole length of the nectophore), 

 it is rounded, of nearly the same breadth over its whole length ; in those nectophores where it 

 is more developed, it gets more or less the shape of the somatocyst of Galeolaria qttadrivalvis. 



The stem and its appendages are all broken off and contracted ; where some appendages 

 were left, we onh' found a few buds of which one would be the future inferior nectophore. 



In Sars' material the inferior nectophore had probably become detached and a new 

 young one was being developed, as is shown by his .sketches. Gegenbaur 60 describes and 

 figures one; it appears that posteriorly the ventral facet is elongated into two lobes. 



Our material also contained loose inferior nectophores, but it was difficult to determine to 

 which species they had belonged. Those which have a necto.sac whose canals run like those in 

 the inferior nectophores of Galeolaria qttadrivalvis, might have belonged to Galeolaria biloba, 

 as Gegenbaur also describes this in his specimens, and in the other species Galeolaria Innicata, 

 cofioidea and inflata the canals run as in ordinary inferior nectophores of Diphyopsinae. They 

 resemble those of Huxley's Galeolaria Jiliformis. Huxley wrongly identified this inferior necto- 

 phore with Galeolaria quadrivalvis, but the nectosac does not show the characteristic narrowings. 

 His specimen is closely connected with the inferior nectophores of our material and as his 

 specimen was caught in the Indian ocean it may be that it too belongs to Galeolaria biloba. 



As to our inferior nectophores belonging to Galeolaria monoica nothing positive can be 

 .said as Chun's description does not contain any detail concerning the course of the canals in 

 the inferior nectophore. 



37. Galeolaria monoica Ch. PI. IX, figg. 76, j-j. 



= Epibulia monoica Ch. 88. 

 = Galeolaria monoica Ch. 97 rt. 



Stat. 168. Anchorage Nortli of Sabuda-island. Cat. 97 E. (i). fonnald. 47o- One sui)ciior necto- 

 phore, length 1 1 mm. 



Stat. 172. Gisser; anchorage between this island and Ceram Laut. Crt/. 42 F. (2). fonnald. 4°/^. 

 One superior nectophore, length 1 1 mm. 



Chun's short and incomplete description of Galeolaria monoica given in 1888 permitted 

 us to recognize two characteristics of the species namely the e.xtraordinarily small size of the 

 somatocyst and the complicated structure of the teeth surrounding the velum in two badly 

 preserved superior nectophores of the Siboga material. 



The size of the somatocyst is comparatively e.xceedingly small, (PI. IX, fig. 76 _L y,,,, of 

 the whole length of the nectophore measured from top to the base of the somatocyst) that is 

 to say nearly invisible, and we suppose therefore that Gegenbaur's Diphyes turgida 54 might 



