310 SUBANTARCTIC ISLANDS OP NEW ZEALAND. [Scypkomedusae. 



of preservation as those from the Auckland Islands, so that there are some points 

 of apparent difference, which may, in reality, be due to difference in maturity or 

 concQtion of preservation. In our specimens the exumbrella is covered with small 

 " nettle- warts." The margin presents 8 rounded velar lobes, separated from one 

 another by 8 pairs of long triangular ocular lappets, which are themselves marked off 

 from each other by deep incisions. Each velar lobe, moreover, has a slight pit- 

 like notch in its middle, at the extremity of the unbranched adradial canal. In one 

 small individual, measuring 16 mm. in diameter, there is a tentaculocyst in each 

 of these pits, making 16 of these sense-organs. The marginal tentacles are some- 

 what coarser than those of A. aurita ; but this may be due to the state of preserva- 

 tion. The oral arms are not " rounded " at the tips, as stated by von Lendenfeld ; 

 they are rather to be described as " lancet-shaped," and are precisely like those of 

 the European species. The margin of the arm-groove is slightly undulating, and bears 

 closely set short filamentous processes, terminating in a rounded knob : these are 

 also coarser than in the Plymouth specimens. In the largest individual the length 

 of the oral arm is about equal to or rather less than the radius of the umbrella ; while 

 in a smaller one, of only 12 mm. radius, the arm is but 7 mm. in length. Von 

 Lendenfeld states in his diagnosis that the arm in A. coerulea is " a little longer than 

 [the radius of] the margin of the umbrella." It seems probable, then, that the arms 

 increase in length as the animal grows, so that this can scarcely be regarded as a 

 specific difference. The mode of branching of the canal system is precisely like 

 that in A. aurita, and certainly does not exhibit the division " at larger angles " as 

 described for A. coerulea ; indeed, these angles are somewhat more acute than in 

 the Plymouth specimens. The gonads are not circular, but are incomplete on their 

 mesial side, so as to be " hoof-shaped," as von Lendenfeld notes ; nor does this ap- 

 pear to be a matter of size, for in individuals of A. aurita of much smaller diameter 

 than ours the gonad is completely circular. 



The specific differences, then, seem to be reduced to two — (1) the existence of 

 16 velar lobes, and (2) the hoof-shaped gonads ; and possibly a third, the presence 

 of the nettle-warts on the exumbrella. 



Dimensions. — Radius of umbrella, 45 mm. ; length of oral arms, 40-45 mm. ; 

 radius from mouth to outer margin of gonad, 16 mm. 



Colour. — Transparent blue ; gonads pale violet. 



Locality. — Auckland Islands : Carnley Harbour (W. B. B.). 



Distribution. — Australia : Port Jackson. 



Remarks. — The only species recorded from the South Pacific in Haeckel's mono- 

 graph* is A. dausa. Lesson, from which ours differs entirely. 



EXPLANATION OF PLATE XIL 



Fig. 1. Hippocrene: Side view. (x4.) 



Fig. 2. Hippocrene: Viewed from below. (X 4.) 



Fig. 3. PhinleUa : Side view. ( x 4.) 



Fig. 4. PhiahUn : From below. ( x 4.) The tentacles in each quadrant are inserted from four different individuals, 



to kHow the slight irregularity in their arrangement. 

 Fig. 5. PhialelUi : 'J'he mouth widely opened, showing the interradial groups of papillae (? digestive glands), and the 



4 radial grooves meeting in the centre. 

 Fig. 6. PhialelUt : \'icw of the stomach from the cxumbrellar asixsct, showing the 4 radial canals meeting in the centre, 



and their differentiation into a proximal and a distal region. 



* Hoeckel, loc. du, p. 558. 



