252 TBANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



Steenstrup (21) during April and May, 1840, off Keike- 

 wig, Iceland, obtained specimens of a free-swimming 

 medusa which he described as follows : — Umbrella bell- 

 shaped, little longer than broad. Manubrium about f the 

 length of the umbrella cavity. Margin of the umbrella 

 obliquely cut off, so that one side of the umbrella is 

 longer than the other. Four radial canals. Four tentacle- 

 bulbs ; three of which are without tentacles, and the other, 

 larger, with two tentacles situated on the longest side of 

 the umbrella. A medusa-bud is also present on the large 

 tentacle-bulb. The ex-umbrella has five longitudinal rows 

 of nematocysts, one following the course of each of the 

 three radial canals running to the non-tentacular bulbs> 

 and two near the canal which joins the large tentacle-bulb 

 carrying the two tentacles. 



Steenstrup also found in the same locality specimens of 

 a small solitary hydroid, attached to the empty shells of 

 Balanus, etc. The hydroid is about J inch long, with 5 

 or 6 tentacles in a single verticil upon the head. Below 

 the head four bell-shaped, quadrangular, medusa hang 

 down, at right angles to one another. The medusa has 

 the margin of the umbrella obliquely cut off. Four ten- 

 tacle-bulbs, without tentacles. The bulb on the longest 

 side of the umbrella is the largest. Steenstrup regarded 

 the large medusae with two tentacles as the adult stage 

 of the young medusae attached to the hydroid, and gave 

 the same name — viz., Coryne fritillaria to both of them. 



Sars (20) found three specimens of a medusa, which he 

 named Steenstrupia globosa, in May, 1836, at Floroen in 

 Sondfjord. They resemble Coryne fritillaria in shape of 

 the umbrella, but have three tentacles on the large bulb 

 on the longest side of umbrella. In May, 1838, Sars 

 again found three more specimens ; one with three 

 tentacles and the others with only one tentacle. Sars 



