MOSS’S POLYSTIGMATIC APPENDICULARIAN. 67 
which is narrow at its attachment, enlarges very gradually 
and attains its greatest breadth near the commencement 
of the distal third of its length, after which it tapers 
gradually to terminate in a pointed extremity; mouth 
destitute of projecting lips; pharynx* devoid of a glandular 
endostyle, and provided with a large number of ciliated 
digitiform processes, arranged in two double rows, one 
pair obliquely dorsal, the other pair ventral, each pair 
being united anteriorly in the mid-ventral line of the 
pharynx; branchial canals (gill-slits) in the form of a pair 
of enormously dilated elliptical apertures in the ventro- 
lateral regions of the body; anus on the right side of the 
body; heart absent. 
Kowalevskia tenwis, Fol, 1872. 
Tai 7+ times as long as the body. 
Caudal muscle-bands narrower than twice the dia- 
meter of the notochord. 
Intestine extremely short; anus highly contractile 
and inconspicuous. 
Habits —Movements slow and lacking energy; has a 
characteristic habit of slowly rotating itself, with- 
out changing its situation, by giving every 3 or 4 
seconds a stroke of the tail, which puts the animal 
in a position at right angles to its previous posi- 
tion. Forms a large gelatinous ‘‘ Haus” of 
peculiarly simple dome-like shape. 
Distribution.—Abundant at Messina from April to 
June, 1871, and met with again in 1878. 
“J have purposely omitted Fol’s statement concerning the absence of the 
peripharyngeal band, for I believe that the dorsal or anterior horse-shoe- 
shaped row of ciliated processes is the morphological equivalent of that 
structure ; its limbs take a course which is identical with that assumed by 
the peripharyngeal band in Otkopleura cophocerca, 
