82 CRUSTACEA COPEPODA. II. 
Saccopsis Levy. 
Only a single species is known. 
99. Saccopsis Terebellidis Lev. 
1877. Saccopsis Terebellidis Levinsen, Vid. Medd. Naturh. Forening i Kjebenhavn, 1877, p. 374, Tab. VI, 
Fig. 2I—22. 
Besides a specimen has been figured (Tab. XV, fig. 40 4) in Steenstrup & Liitken’s work and referred 
by them with doubt to Herpyllobius arcticus. 
Levinsen established this form on 2 specimens, one of which is preserved; it is impossible to see 
more on the type than that described by him in 1877. A specimen from Tasiusak is larger, with the anterior 
part of the body more slender and produced; the frontal bulla shows a distinct central hole. In contradistinc- 
tion to Herpyllobius Levinsen could not discover any part of the parasite hidden within the host and projecting 
from the margin of the bulla; I have inspected the above-named specimen from Tasiusak, removing a portion 
of the bulla from the tissue of the parapodium, but could not discover any internal part of the parasite; besides 
the inspection in a similar way of one of the specimens collected by Bergendal gave the same negative result. 
It is, however, scarcely possible to decide the question with absolute certainty before a good material well 
preserved for cutting sections has been procured. — No male could be discovered on any females. 
Occurrence. — Not taken by the “Ingolf”’. 
It has been taken at the following 3 places in northern West Greenland and always on Terebellides 
Stroemi: Umanak Lat. 70°40’ N., I specimen referred with doubt by Stp. & Ltk. to Herpyllobius (Moberg 
leg.); Fortune Bay, Lat. 69°15’ N. on Disko, 20 fath., I specimen (Oberg, Sv. Riksmuseum); Jakobshavn, 
Lat. 69°13’ N., 4 specimens (Bergendal leg., Levinsen det.); Egedesminde, Lat. 68°42’ N., 2 specimens, (de- 
scribed by Levinsen). —- Furthermore taken at Tasiusak, East Greenland at Lat. 65°37’ N., 6—10 fath., on a 
setiferous parapodium far in front on a specimen of Terebellides Strvoenui (Il. Amdrup Exped.). 
K. Stephensen (in “Meddelelser om Gronland. LIIT’’, 1916, p. 305) mentions 3 specimens on Leuca- 
viste arcticus M. Sars from Bredefjord, southern West Greenland; he refers them with a query to Saccopsis 
Terebellidis, and it is far from improbable that they belong to another species. 
Genera of unknown position. 
Crypsidomus Lev. 
This genus, established on a single species, is completely endoparasitic, as only the ovisacs are found 
outside the body of the host. Possibly it is somewhat related to Xenccoeloma Brumpti Caullery & Mesnil, an 
extremely curious hermaphroditic Copepod, which has been the subject of an elaborate and admirable study 
by the two French Zoologists (Bull. Biol. de la France et de la Belgique, T. LIII, 1919, p. 161—233, Pls. I—IV 
et 20 fig. dans le texte)«. 
1 A digression may perhaps be inserted here. In reading the French papet the idea strikes me that it would be extremely 
desirable if some able Zoologist, who possesses much experience in modern technicalities, could spent some months at Egedesminde 
in order to collect and partly to study on the spot a rich material af Crypsidomus, Herpyllobius and Saccopsis — it would be 
difficult to point out any other group of marine animals promising so remarkable results as I venture to predict the anatomy 
and development of these Copepods can yield. 
