L909] Torrey:Tlu Leptomedusae of tht San Diego Region. 



21 



Diameter -i-4 mm. 



Distribution. — Off San Diego in winter and summer, at the 

 surface and in vertical hauls from various depths to 160 fathoms. 



This species resembles 0. dichotoma and may prove to be the 

 medusa from the hydroid in this region that I have identified 

 with the European 0. dichotoma. 



Gen. Phialium Haeckel, 1880. 

 Eucopidae with 12 statoeysts, 4 perradial tentacles with basal 

 cirri, gastric peduncle wanting. 



Phialium bakeri, n. sp. 



Fig. 7. 



In an earlier paper I 1904, p. 16 I, 

 I described from preserved material, 

 under the name of Clytia bakeri, a 

 hydroid whose gonophores within the 

 gonangia were seen to possess two ten- 

 tacles and the stumps of two more 

 (though owing to an oversight in 

 reading proof the gonophores were de- 

 scribed as sporosacs). The nexl sum- 

 mer, colonies of this species dis- 

 charged, in the laboratory, medusae 

 of the following description: 



Umbrella longer than broad, very 

 thin, without gastric peduncle. Ma- 

 nubrium moderate, tapering, without 

 oral lobes. Two tentacles 3-4 times 

 the length of umbrella, with bulbous 

 bases, at ends of opposite radial ca- 

 nals, each with a pair of long basal 

 cirri; tentacular fundaments in con- 

 nection with other radial canals. 

 Pour interradial statoeysts. each with 

 a single statolith. Broad velum. 

 Ovate gonad from about the middle 

 of each of the canals associated with 

 I he longer tentacles. 



Fig. 7.—Phialiui 



X 82. 



bakei 



