306 General Notes. (March, 
any known larva, characteristics of the young of both the grou 
of Chzetopods and that of the Marine Polyzoa. 
The identification at present accepted of the genus into which 
Mitraria is developed, is not wholly satisfactory. Mitraria was 
first found figured and described by Johannes Müller He speaks 
of three species, and regards them as the larvæ of some Annelidas 
genus. The next naturalist in order of time who studied Mitrana 
was Claparede,? who fished the animal with the dip-net on the 
coast of Scotland. Neither Miiller nor Claparede observed tht 
transformation of the larva which they had found into a worm o 
had anything more than a speculative knowledge of the genus t 
which it belongs. Schneider? was the first to observe a new stagt 
in the development of Mitraria. He found that this larva, whe 
left in his glasses, was replaced by one which he considered ap 
proximately in form that of a Gephyrean. Kowalevsky, how: 1 
ever, according to Metschnikoff, had determined the Chetan . 
nature of Mitraria in 1867, although he had not published 
discovery. The last step in the history of the attempts to ‘ald 
mine the adult of Mitraria we owe to Metschnikoff,* who A 
it into a Chztopod belonging to the family of Clymeniee io 
though he was not able to determine the genus of Annelids ui | 
which it developed, he traced it into a tubicolous worm, | 
has many resemblances to some of the genera of this famiy. 
has the closest likeness to Mitraria. It is, however, À 
far removed from it in many points of structure. ss Cyd 
The Polyzoan larva, which it approaches most ea p 
pelma, the young of Loxosoma.’ Cyclopelma longicil eternit 
first described by Busch,’ who was, however, pence 
satisfactorily the adult form. Leuckart® first Bes Fe r oe ae 
Ima is the young of the entoproctous Polyzoan, i 
The new Reis which I am about to describe has many af i 
with Cyclopelma, as well as with Mitraria, and seems 
ate between the two. a 
The general form of our new larva is as follows: sit ye 
Its body has an elongated, oval shape, girt equa?" spote 
swollen belt (cb) upon he margin of which the cilja $ 2 
1 Arch. f. Anat. u. Phys., 1854, p. 88, Pls. v, VI. 
? Zeitschr. f. Wiss. Zool., X, p. 407. 
* Arch. f, Mikros. Anat., v (1869), p. 271. ee 
*Zeitschr. f. Wiss. Zool., XXI, p. 233, Pl., XVIIL ibed was foumi tt” 3 
5 A new Mitraria of large size, differing from any yet deere ya i 
in the Bermudas in May, 1882. 5 w is founds igh i 
* Let me add to Dr. Leidy’s list of localities where this te from New ” ° 
England coast, on Sipunculus; Professor Verrill also reports 1t ™ 
coast. (Preliminary Check-list.) 
"Beobach, über Anat. u. Entwick. wirbellos, Thiere, 1851. 
* Arch, f. Naturg., 1867, p. 304. 
