248 THE ANTARCTIC MANUAL. 
CQ@ELENTERATA. 
Class I—HypRoMEDUS& (CRASPEDOTA). 
(A.) LupromEDUS#-CALYTOBLASTEA. But few Puvsrvrarup#x are 
deep-sea; the genus Cladophorus has, however, been dredged from 
depths as great as 900 fathoms off the Azores. In our region (i) 
Plumularia insignis, Allm., was taken at station 145 at depths of 
150 and 310 fathoms, and one or two other species occurred at a less 
depth. Numerous other species of Leptomedusee were taken in 
shallow waters, mostly under 100 and none over 150 fathoms. 
(B.) ANTHOMEDUSH-GYMNOBLASTEA. Hydroid forms were not met 
with in the depths in our area, but a deep-sea Medusa, (1i.) Thamno- 
stylus dinema, Haeck., of the family T'zamvosromarip2, was taken 
at station 153, and although the depth was only 150 fathoms, it 
deserves mention as being taken at the most southern locality where 
dredging took place. This species has a remarkable development of 
the oral organs, a long cesophagus and four much branched oral 
processes of a blood-red colour. The branches, amounting to more 
than a thousand, terminate in stinging knobs. Only two marginal 
tentacles are developed. 
(C.) HypDRocoRALLIN& are not represented by any specimens 
dredged by the Challenger, but the following species have been 
recorded at other times, from the Antarctic Ocean; (iii.) Evrina 
Jissurata, Gray ; (iv.) Labiopora antarctica, Gray. 
(D.) TRAcHYMEDUS& are represented by (v.) Pectis antarctica, 
Haeck., of the typical abysmal family Pzcrrzumz, The single speci- 
men obtained was taken at station 152, The whole umbrella edge 
is beset with sucking tentacles. The csophagus has 8 adradial, 
ectodermal, oral funnels alternating with 8 endodermal pouches, an 
arrangement peculiar to this genus. The Pzerrzum.s, like many 
abysmal Meduse, are deficient in sense-organs. It has been sug- 
gested that they walk about on the ends of their curiously-knobbed 
sucking-tentacles. 
(E.) NarcomEpus& have but one deep-sea Medusa from our area, 
(vi.) Aginura myosura, Haeck., of the family Wemvnrivs, taken at 
station 159, one specimen only. 
(F.) StpHoNoPHORA, represented by (vii.) Disconalia jpectyllis, 
Haeck., taken at station 157, and interesting as one of the Siphono- 
phora which has a very medusoid shape and characters. It is a 
member of the family Discarr#, which Haeckel unites with the 
familes Porpiriox and Verezzmx in the group DISCONECTA. 
