142 Transactions. 



The characteristic features upon which this genus was founded 

 are (1) the great extent of the costse and the large size of the 

 costal plates ; (2) the tentacles issue from the tentacular sheath 

 very high up the sides. 



^The present species differs from E. stationis, described by- 

 Chun, p. 283, in a few very evident characters. The " tentacle- 

 base " is about one-third the length of the body, and extends 

 considerably below the level of the " infundibulum " ; the 

 tentacillse or accessory filaments do not roll up into spirals, 

 and I am unable to detect the transversely striated muscle 

 within them which Chun describes for E. stationis. 



Localities. — (a.) A single individual : off the north coast 

 of the South Island, near Farewell Spit (G. M. Thomson). 

 (6.) Several young ones : Otago Harbour (Cottrell).* 



The largest individual, is 20 mm. in length, with a greatest 

 diameter of 12 mm. rather below the equator, while near the 

 aboral pole its diameter is 8 mm. 



The specimen preserved in formalin exhibited the internal 

 anatomy well (see Plate VII, fig. 1). The gonads are present, 

 but the gametes not fully developed. The long " infundibular 

 canal," large " infundibulum," the radiating canals from it, are 

 all shown. Those from Otago Harbour are young ones, and in 

 them the enormous breadth of the costae and the great size of 

 the individual costal plates can be seen. 



These young ones measure, on an average, 5 mm. x 3 mm. 

 The costae almost touch one another, and each is made up of 12 

 plates. In these young ones the aperture of the tentacle-sac 

 is much nearer the apex, and the length of the tentacle-base is 

 about half the length of the animal, and its lower end reaches 

 nearly to the lower end of the costa : this is perhaps due to 

 unequal contraction of the parts : these had been fixed in cor- 

 rosive sublimate and preserved in alcohol, which causes the 

 jelly to shrink to a much greater extent than does formalin. 



Remarks. — A comparison of the figures and description of 

 E. stationis with those of our species makes it evident that there 

 are considerable differences between them. But since the pub- 

 lication of Chun's monograph on the Mediterranean ctenophores 

 two other species belonging to this genus have been described. 

 E. cucumis, Mertens, has been redescribed by Vanhoffen,t to 

 whose account, however, I have not access. It was obtained 

 near Unalaschka, in the Behring Sea. The short account given 

 by Mertens is referred to by Chun (footnote, p. 284), where it is 



* I have also a specimen, 9 nun. in length, from Port Jackson 

 I Vanhoffen, " Ctenophoren," in Nordische Plankton, 1903. 



