:358 W. M. Bale: 



at Moore Park, near Sydney, but the characters given do not 

 suffice for identification. 



The characters made use of by Brauer in discriminating the 

 species include, in addition to those recognized by the older 

 observers, the sexual condition, the form of the egg, and the num- 

 ber of distinct forms of nematocysts present. Without tliese 

 details identification is uncertain. 



For the assistance of observers who may engage in the study 

 of our local species, I append the following diagnoses, compiled 

 from the descriptions of Brauer and Annandale and other authors. 



H. viridls Lin. — Body cylindrical or gradually more slender 

 towards the lower extremity, not stalked. Tentacles 6-10, shorter 

 than the body. Three sorts of nematocysts. Hermaphrodite. Egg 

 spherical, with reticulated, nearly smooth surface. Colour grass- 

 green. Syn. — H. viridissima Pallas; //. gracilis Agassiz. 



H. vulgaris Pallas. — Body cylindrical, not stalked. Tentacles 

 7-12, little longer or not longer than the body. Four sorts of 

 nematocysts. Hermaphrodite. Egg spherical, set with coarse 

 spines which are expanded or bifid at the tips, deciduous, Colour 

 brown, orange, gray, reddish, yellowish. Syn. — H. grisea Lin., 

 H. atteu'uata Pallas,? //. aurantiaca Ehrenberg, //. rubra Lewes, 

 H. hruimea Templeton, //. tremhleyi Haacke. 



H. oligactis Pallas. — Body " stalked," 2-3 cm. long. Tentacles 

 6-8, long, capable of great extension to several times as long as 

 the body. Three sorts of nematocysts. Dioecious. Gonads on the 

 ^vhole body except on the stalk-like part. Eggs mostly adherent in 

 groups, subspherical, wdth very short simple spines. Colour, gray, 

 brown, reddish. Syn. — //. fusca Lin., //. carnea Agassiz, H. 

 rhaetica Asper, //. roeseli Haacke, //. rhistica Asper, H. verrucosa 

 Templeton, //. dioecia Downing. 



//. hraueri Bedot. Body '* stalked," not more than 2 cm. long, 

 mostly 1-lJ. Tentacles much longer than the body. Four sorts of 

 nematocysts. Hermaphrodite. Gonads borne only on the distal 

 part of the body. Eggs attached singly, convex above, with short 

 simple spines, flat and smooth below. Colour, gray, brown. Syn. — 

 H. polypus Brauer (not Lin.) 



H. orientalis Annandale. — Body " stalked," lJ-3 cm. long. 

 Tentacles 5-6, long, capable of great extension (to 3-6 times as long 

 as the body). Three sorts of nematocysts. Dioecious. Gonads 

 ■confined to the upper part of the body. Normal eggs spherical, set 

 wath fine spines which are bifid or expanded at the tip. Abnormal 



