SYMPHYTOBRANCHII. 339 
Total length two and one half, length of head three sixteenths, depth 
three eighths, and length of body cavity fifteen sixteenths inches. 
Station. Latitude. Longitude. Depth. Time. 
2627 0° 36’ N. 82° 45’ W. Surface to 1740 fathoms 6 49™ a.m. March 25, 1891. 
MYXINIA. 
SYMPHYTOBRANCHII. 
The names Cyclostoma Lam., 1801, and Cyclostomus Montf., 1810, both 
having been used in the Mollusca, there is question of the propriety of 
retaining either Cyclostomes, 1806 (Family name, in French), Cyclostomia, 
1815 (Family), Cyclostoma, 1825 (Order), Cyclostomi, 1831 (Order), or 
Cyclostomata, 1852 (Division), for a general term in connection with the 
Myxinoid fishes. Auloedibranchia, 1825 (Family), and Diporobranchia, 1825 
(Family), are not particularly appropriate for more comprehensive designa- 
tions. Gymnobranchii, 1832 (Order) is inapplicable on account of prior use 
of Gymnobranches, 1816, in Crustacea, and of Gymnobranchiata, 1820, and 
Gymnobranchia, 1821, in the Molluscs. Symphytobranchii, 1832 (Tribe), 
is less objectionable, while Marsipobranchii, 1858 (Subclass), is suitable in 
other respects but lacking too much in regard to priority. Dermoptéres, 
1806, and Dermopteria, 1815, were originally names for a family including 
only Salmonidx and Characinide. Discarding Cyclostomia, choice apparently 
is limited to Myxinia, Symphytobranchii, and Marsipobranchii in selecting a 
class name for the Myxinoids. To adopt Myxinia, from Rafinesque’s sub- 
family of 1815, his family name, Cyclostomia, also 1815, being an infringe- 
ment on Cyclostoma 1801 and Cyclostomus 1810 of the molluses, will give 
less occasion for recurrent unsettling discussions of priority than in case of 
either the tribe or the subclass name, however much one of them might be 
preferred in some respects. 
Previous to the year 1891 the known horizontal distribution of the marine 
Myxinia was about as follows: Geotria had been secured off the coasts of 
Chili and of South Australia, Mordacia off the coasts of Chili and of New 
Zealand, Petromyzon off the western coasts of Europe, off the northeastern 
and the northwestern coasts of North America, off the southeastern coasts of 
South America, and off the coasts of Japan, Homea off the coasts of Chili, of 
California, of New Zealand, and in the “South Seas,” and Myxine off the 
