ON THE ANGUILLULID^. 177 



gradually towards the tail, whicli is somewhat curved and obtuse at the extremity. 

 Viilva 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 tV" long, and TorTo" broad." 



'* Male, unseen." . 



" Hab. Same as foregoing." 



5. U. PARASITICA, Carter. 



Loc. cit. p. 44, et vol. ii. pi. iv. fig. 50. 



" Feynale, linear, cylindrical, unstriated ; gradually diminishing towards the head, which 

 is obtuse and without papilla?, and also towards the tail, which is long and conical. 

 Vulva a little in front of the middle of the body." 



" ffisophagus 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 oesophagus 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, -i^" long." 



" Male, unseen." 



" Sab. Peritoneal cavity' of Nais alhida ; in more or less abundance during the ' rains,' 

 when this Nais makes its appearance in the Gloeocapsa mentioned, Island of Bombay. 



6. U. ERTTHBOPS, Carter. 



Loc. cit. p. 42, pi. iii. fig. 29. 



" Female, linear, cylindrical, minutely striated transversely, ocellated ; gradually dimi- 

 nishing towards the head, which is obtuse and without papillae, also towards the tail, 

 which is long and conical. Vulva just about the middle of body. (Esophagus com- 

 mencing 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 oesophagus, opake, of a rich 

 carmine colour in their posterior three-fourths, and the anterior fourth or corneal portion 

 bluish opalescent." 



" Size -^" long, and ^^y^" broad." 



" Male, the same as the female, but with the posterior part of the body terminating more 

 abruptly, and the tail more attenuated." 



" Hab. Silty clots of Oscillatoria floating in the salt-water main drain of the town of 

 Bombay." 



' Vide note, p. 77 of this Memoir. 

 VOL. XXV. 2 A 



