190 



THE MEDUSAE. 



All at surface 



At stations 4646 and 4648 

 swarms ; at each of the other 

 stations several specimens were 

 taken. 



CytaeiS Vulgaris Agassiz and Mayer. 



Cytaeis vulgaris Agassiz and Mayer, '99, p. 161, pi. 2, figs. 3-5 ; Maas, : 05, p. 8, taf. 1, 



figs. i-7. 

 Cytaeis herdmani Browne, : 05 b , p. 135, pi. 1, fig. 1, pi. 4, fig. 12. 



Plate 6, Fig. 3 ; Plate 40, Figs. 2, 5 • Plate 43. Fig. 4. 



Station 4644 ; surface 



Station 4646 ; surface 



Station 4646 ; 300 fathoms to surface 



Station 4648 



Station 4655 



Station 4667 



Station 4678 



Station 4681 



Station 4682 



Station 4694 



Station 4704 



Station 4712 



Station 4716 



Station 4717; 300 fathoms to surface 



Station 4731 ; surface 



Station 4733 ; surface 



Station 4735 ; surface 



Station 4741 ; surface 



The series is of various sizes up to 5 mm. in diameter. 



The general characteristics of this widely distributed Indo-Pacific species 

 have been so well described by Agassiz and Mayer ('99, : 02), by Maas (: 05), 

 and by Browne (: 05 b ), that repetition here is unnecessary. Reference must, 

 however, be made to the number of oral tentacles, since Browne has main- 

 tained that the great number (fifty to sixty) of these organs in his speci- 

 mens is distinctive of C. herdmani. In the present series the number proves 

 to be very variable, yet in general increasing with the growth of the Medusae. 

 The maximum observed, in a specimen 5 mm. in diameter, was forty-two, 

 thus approaching so closely to Browne's minimum that I have no doubt as to 

 the common identity of Pacific and Ceylon specimens. Maas counted only 

 thirty-two; Agassiz and Mayer in their largest individual only sixteen. 

 Small specimens have even fewer, their least advanced specimen having 

 only four (Agassiz and Mayer, '99). 



