ON THE ANGUILLULIDÆ. 177 
ually towards the tail, which is somewhat curved and obtuse at the extremity, 
Vulva considerably posterior to the middle of body.” 
« Alimentary canal the same as in the foregoing species, but without buccal dilatation. 
Organs of generation undetermined.” 
« Size Az” long, and 4959 broad." 
« Male, unseen,” 
“ Hab. Same as foregoing.” 
5. U. parasitica, Carter. 
Loc. cit. p. 44, et vol. ii. pl. iv. fig. 50. 
* Female, linear, eylindrical, unstriated ; gradually diminishing towards the head, which 
is obtuse and without papillæ, and also towards the tail, which is long and conical.. 
Vulva a little in front of the middle of the body.” 
“(Esophagus commencing in an expanded oral orifice, immediately becoming narrowed 
into a straight, uniform tube, naked at the commencement, but soon surrounded by a 
sheath, which goes on increasing in width to the point of union of the esophagus and 
intestine, after which it continues of uniform calibre to the termination of the latter. 
Organs of generation double, occupying the middle third of body." 
* Size, 23 long." 
* Male, unseen." 
" Hab. Peritoneal cavity' of Nais albida ; in more or less abundance during the ‘ rains,’ 
when this Vais makes its appearance in the Gæocapsa mentioned, Island of Bombay. 
6. U. zRYTHROPS, Carter. 
Loc. cit. p. 42, pl. iii. fig. 29. 
" Female, linear, cylindrical, minutely striated transversely, ocellated ; gradually dimi- 
nishing towards the head, which is obtuse and without papillæ, also towards the tail, 
Which is long and conical. Vulva just about the middle of body. Œsophagus com- 
meneing with a cup-like followed by a globular dilatation, after which it becomes 
narrow, uniform in width, and pursues a straight course back to the intestine. Intestinal 
sheath presenting a constriction just after its commencement, which gives it a globular 
form, part of which only is lined with the hepatic organ. Organs of generation double, 
occupying the middle third of the body." 
“ Ocelli consisting of two globular bodies, situated a short distance from the head, and 
between (?) the peritoneal and muscular sheaths of the cesophagus, opake, of a rich 
carmine colour in their posterior three-fourths, and the anterior fourth or corneal portion 
bluish opalescent.” i 
“Nize 3" long, and 75 broad.” 
“ Male, the same as the female, but with the posterior part of the body terminating more 
abruptly, and the tail more attenuated.” 
E Silty clots of Oscillatoria floating in the salt-water main drain of the town of 
y." 
' Vide note, p. 77 of this Memoir. 
VOL. XXV, a; 
