258 
Zoogeographical Remarks on the 6 Species 
of Deep Sea Medusæ. 
1 Leptomedusa ( Thaumantias rubrum (Fewkes)), 2 Trachy- 
medusæ ( Aglantha rufobrunnea n. sp. and Pantachogon rubrum 
Vanhoffen), 1 Narcomedusa {Aeginura Grimaldii Maas) and 2 
Acraspedæ ( Atolla Bairdi Fewkes and Periphylla hyacinthina Steen- 
strup) were taken in the deep-water hauls of the “Tjalfe” Expedition. 
Thaumantias rubrum Fewkes is known, hitherto, only from 
deep water in the northern Atlantic, being described by Fewkes 
(1882) from off New Englands coast; it has not been recorded later 
on from other places, but I have seen several specimens, taken by 
the “Michael Sars” from deep water in the northern Atlantic in 
1910. The “Tjalfe” has taken it in the deep Davis Strait about 
63° and 64° n. Lat. 
Aglantha rufobrunnea n. sp. was taken in the Davis Strait, 
63° 18' n. Lat., with 1530 m. wire. The nearest related species 
is Aglantha ( il Melicertuni n ) proboscifer (Maas), taken from deep 
water in the eastern tropical Pacific. 
The four other species are known from the tropical Atlantic 
deep sea. 
Atolla Bairdi Fewkes is only known from the Atlantic area, 
found in the tropical (Vanhoffen 1902 a) and the northern boreal 
depths whence it extends into the Davis Strait, being taken as far 
northwards as 64° 35' n. Lat. 
Periphylla hyacinthina Steenstrup has a similar distribution, 
but it occurs somewhat more abundantly and penetrates f urther 
northwards,, being known from Spitzbergen and is common in the 
Irminger Sea; furthermore it is known from the tropical depths of 
the northern Indian Ocean (“Valdivia”, Vanhoffen 1902 a). The 
“Tjalfe” found a great many specimens as far northwards as 
66° 45' n. Lat., close to the submarine ridge between Davis Strait 
and Baffins Bay. In the colder latitudes it may be seen occasion- 
ally in the upper layers of the water. 
