166 THE SCYPHOMEDUS.E OF THE SOUTHERN HEMISPHERE, 



Clark, is very abundant ; but nowhere else. Our species is 

 accordingly the second. Unfortunately it is very rare, so that 

 my description must be imperfect as I only got two specimens, 

 both of which were cut into sections forthwith. 



Umbrella deep bell shaped, expanded about half as broad as 

 high (in Cr. Tethys broader than high). Stalk about § of the 

 height of the umbrella, (in Cr. Tethys only ^ — ^.) Eight arms 

 short at equal distances. Every arm with a cluster of about 30 

 tentacles. The Gonads are like those of Cr. Tethys, feathery. 



Colour : Dark olive green, fades in spirits. 



Size : Height of umbrella, 12 mm. ; breadth, 6 mm. ; stalk, 

 8 mm. high ; and extended 3 mm. thick. 



Locality : East coast of New Zealand, Port Chalmers, Hutton, 

 Lyttleton, von Lendenfeld. 



On Microcystis. 



II. Ordo Peromedus^e. Haeckel, 1877. 



Scyphomedusie, with four interraclial organs of sense, which 

 contain an organ of hearing and several eyes, 4 or 12 tentacles, 

 8 or 16 marginal laps. Stomach surrounded by a large subumbral 

 ring-shaped sinus, with four interraclial strictures. Four pairs of 

 frill-shaped Gonads. 



3. Family. Pericolpidce. Haeckel, 1877. 



Margin of Umbrella with four perradial tentacles and 8 

 adradial marginal laps. Festoon-canal with 16 pouches. 



4. Gen. Pericolpa. Haeckel, 1879. 



Without perradial pouches, with continuous funnel-cavities, 

 four interradial Tseniols, in the basal stomach are solid bars 

 without gastral filameuts. 



4. Sp. Pericolpa quadrigata. Haeckel, 1879. 

 Haeckel System der Medusen. Seite, 413. 

 Tafel, XXIII. 



