ISOPODA. 31 



Uropoda similar in both sexes, rami lamellar, exopodite considerably shorter 



than endopodite. 



Mouth parts similar in both sexes. 



Male with appendix masculina on the endopodite of the second pleopod. 

 Marsupial lamellae overlap each other somewhat, the brood in an exceedingly 



large external pouch and in the marsupium. 



CYMODOCELLA TUBICAUDA. 



Cymodocella tubicauda Pfeffer (11), pp. 110-115. 



Sphieroma egregium Chilton (2), p. 209. 



Cymodocea antarctiea Hodgson (8), pp. 243-2-15. 



Cymodocella egregia Hansen (7), p. 12G; Richardson (12), p. 7. 



This species was first described by Dr. Pfeffer from specimens taken in South 

 Georgia. It was then found by Dr. Chilton in New Zealand the South Island ; 

 more recently it was taken by the ' Southern Cross ' Expedition in the Auckland 

 Islands. 



On all these occasions it has been more or less perfectly described as a new species. 

 It now turns up off the Antarctic continent at Cape Adare, and it is hoped that its 

 identity is now fully and permanently established. As my description of the animal 

 was so unsatisfactory it is here re-described. It is a little unfortunate that both 

 Dr. Hansen and Miss Richardson have made use of Dr. Chilton's name for the species. 

 That of Dr. Pfeffer has a priority of five years. 



Specific characters : 



Body vaulted, cephalosome short, with small dorso-lateral eyes. 



Antenna invisible from above. 



Pereiopoda ambulatory, first the shortest, the remainder very slightly increasing in size, armed 

 with a stout curved claw on the dactylus and one, occasionally two, stumpy accessory ones. 



Metasome, always with one distinct segment, and two others imperfectly separated dorsally ; a 

 pointed tubular urosome. 



The cephalosome is small, rather broad but short, the anterior margin, seen from 

 above, is rounded, it bends downwards and terminates with a small rounded rostrum 

 between the antennae ; the lateral margins bulge for the reception of the small eyes 

 which are postero-laterally situated ; the posterior margin is incurved. It is about 

 two-thirds the diameter of the first segment of the mesosome. 



The mesosome comprises the normal seven segments of which the first is the 

 longest and largely envelops the cephalosome, the epimera are large, ending 

 posteriorly in a blunt point. The succeeding three segments are subequal in length, 

 with rather small irregularly rounded epimera. Of the three posterior ones the first is 

 a little shorter than the others. The epimera are larger and project backwards, the 

 last of the three segments is narrower than the rest, and the posterior border of the 

 epimera rises abruptly from its segment. In no case are the epimera separable from 

 their respective segments. 



